PART 1755 -- TELECOMMUNICATIONS STANDARDS AND SPECIFICATIONS FOR MATERIALS, EQUIPMENT AND CONSTRUCTION
Sec.
1755.1 -- 1755.2 [Reserved]
1755.3 Field trials.
1755.4 -- 1755.92 [Reserved]
1755.93 List of standard forms of telecommunications contracts.
1755.94 -- 1755.96 [Reserved]
1755.97 Incorporation by reference of telephone standards and specifications.
1755.98 List of telephone standards and specifications included in other 7 CFR parts.
1755.99 -- 1755.199 [Reserved]
1755.200 RUS standard for splicing copper and fiber optic cables.
1755.201 -- 1755.369 [Reserved]
1755.370 RUS specification for seven wire galvanized steel strand.
1755.371 -- 1755.389 [Reserved]
1755.390 RUS specifications for filled telephone cables.
1755.391 -- 1755.396 [Reserved]
1755.397 RUS performance specification for line concentrators.
1755.398 -- 1755.521 [Reserved]
1755.522 RUS general specifications for digital, stored program controlled central office equipment.
1755.523 -- 1755.524 [Reserved]
1755.525 Form 525, central office equipment contract (including installation.)
1755.526 -- 1755.859 [Reserved]
1755.860 RUS specification for filled buried wires.
1755.861 -- 1755.869 [Reserved]
1755.870 RUS specification for terminating cables.
1755.871 -- 1755.889 [Reserved]
1755.890 RUS specification for filled telephone cables with expanded insulation.
1755.900 RUS specification for filled fiber optic cables.
1755.910 RUS specification for outside plant housings and serving area interface systems.
        Authority: 7 U.S.C. 901 et seq., 1921 et seq., 6941 et seq.
        Editorial Note: Nomenclature changes to part 1755 appear at 55 FR 39397, Sept. 27, 1990.
__1755.1 -- 1755.2 [Reserved]
_1755.3  Field trials.
        (a) Except as covered in Bulletin 345 - 3, no loan funds shall be advanced for any product if any item to be included in the project is not included in the ``List of Materials Acceptable for Use on Telephone Systems of RUS Borrowers,'' RUS Bulletin 344 - 2. When new items of materials or equipment are considered for acceptance by RUS or when a previously accepted item has been subjected to such major modifications that its suitability cannot be determined based on laboratory data and/or field experience, a field trial shall be required if RUS so determines. This field trial consists of limited field installations of the materials or equipment in closely monitored situations designed to determine, to RUS's satisfaction, their operational effectiveness under actual field conditions. Field trials are to be used only as a means for determining, to RUS's satisfaction, the operational effectiveness of a new or revised product under actual field conditions. Both the manufacturer and borrower are responsible for assuring that the field trial is carried out and that the required information on the product's performance is received by RUS in a timely manner. The use of materials or equipment derived from new inventions or concepts untried within the telephone industry is defined as ``an experiment'' and shall be handled as a special case using procedures considered appropriate by RUS to meet the individual experiment.
        (b) To qualify for a field trial, the new and improved materials and equipment must appear to RUS to offer one or more of the following benefits:
        (1) Improved performance.
        (2) Decreased cost.
        (3) Broader application.
        (c) The item of material or equipment subject to field trial may be only part of the total amount of materials or equipment included in a bid or it may be the key component of the facility or system provided; therefore, RUS shall have authority to require that a satisfactory plan be provided to maintain or restore service in the event that the materials and equipment fail to meet established performance requirements. RUS shall limit the quantity of new materials and equipment installed on any field trial and shall also limit the number of field trials for a given product to what RUS considers reasonable to provide the necessary information.
        (d) A borrower may participate in a field trial only if, in RUS's opinion, the borrower possesses:
        (1) Adequate financial resources so that no delay in the project will result from lack of funds.
        (2) The financial stability to overcome difficulties which may result from an unsuccessful field trial. The borrower must be able to restore and maintain service until the manufacturer meets its financial obligations with respect to the field trial.
        (3) Qualified personnel to enable it to discharge its responsibilities.
        (4) A record satisfactory to RUS for maintaining equipment and plant facilities and for providing RUS with information when requested.
        (5) Willingness to participate in the field trial and awareness of the effort and responsibility this entails.
        (e) The test site for the field trial shall be, in RUS's opinion, readily accessible and provide the conditions, such as temperature extremes, high probability of lightning damage, etc., for which the product is being evaluated. The material or equipment involved shall be covered by an RUS specification or a suitable standard acceptable to RUS. The supplier is required to submit test data to show conformance with the applicable specification or standard. Further testing shall be performed if required by RUS personnel.
        (f) A field trial shall normally continue for a minimum of six months, or for a longer period of time determined by RUS to be required to obtain conclusive data that the item either fulfills all requirements or is unacceptable. Either the borrower or supplier may terminate a field trial at any time, in accordance with their contractual agreement. Such termination, if prior to the time required by RUS, shall constitute withdrawal of the product from consideration by RUS. RUS has authority to terminate field trials based on its determination that the equipment is not performing satisfactorily and that this lack of performance may, in RUS's opinion, cause service degradation or hazards to life or property.
        (g) Field trials shall be conducted in accordance with the instructions set forth in this regulation and the agreement relating to the specific application. Both the supplier and the borrower shall agree, and obtain RUS approval before the start of the trial, on the following:
        (1) The specific purpose of the field trial;
        (2) Ownership of items during trial;
        (3) Starting date and duration;
        (4) Responsibility for costs and removal of items in the event of noncompliance with the specification or purpose intended and arrangements for service continuity or restoration;
        (5) Responsibility for testing, test equipment and normal operation and maintenance during the trial period;
        (6) Availability of test equipment on site during the trial period; and
        (7) Responsibility for spare parts and components consumed during the trial period.
        (h) Both the supplier and the borrower shall keep RUS informed of the status of a field trial. These reports shall not be limited to details of problems of failures encountered during installation and subsequent operation but shall include information on progress of the field trial. If these reports are not received in accordance with the requirements of the RUS Form 399b, RUS shall have the authority to deny or suspend loan funds related to these products until the delinquent reports are received.
        (i) Before a borrower purchases materials or equipment that require a field trial, prior approval must be obtained from RUS and RUS Form 399b, RUS Telecommunications Equipment Field Trial (available from the Director, Administrative Services Division, Rural Utilities Service, Room 0175, South Building, U.S. Department of Agriculture, Washington, DC 20250) will be completed by RUS and must be signed by both the borrower and supplier as an indication that they understand their responsibilities in the field trial. Assurance must also be obtained from RUS that the ``particular item'' that is the subject of the field test is eligible for a field trial. To obtain this assurance, any proposal for use of an item on a field trial basis shall be forwarded to the Chief, Area Engineering Branch, for review and approval.
        (j) Procedures for establishing field trials for the various categories of equipment after RUS has approved the 399b:
        (1) Electronic transmission equipment. The procedure set forth in Bulletin 385 - 2 ``Purchasing and Installing Special Electronic Equipment'' shall be followed except that the Special Equipment Contract (Including Installation), RUS Form 397, shall be used in all purchases of electronic equipment for field trials. In addition, the borrower and supplier shall execute three copies of a ``Supplemental Agreement to Equipment Contract for Field Trial,'' RUS Form 399, or a ``Supplemental Agreement to Equipment Contract for Field Trial (Secondary -- Delivery, Installation, Operation)'', RUS Form 399a, as well as three copies of the RUS Form 399b, ``RUS Telecommunications Equipment Field Trial'', and forward them, together with three copies of the executed contract and specifications, to the Chief, Area Engineering Branch. A limited number of copies of RUS Forms 399, 399a, and 399b are available from RUS upon request from the Director, Administrative Services Division, Rural Utilities Service, Room 0175, South Building, U.S. Department of Agriculture, Washington, DC 20250. Additional copies may be reproduced by the user as needed. This category includes:
        (i) Voice frequency repeaters;
        (ii) Trunk carriers;
        (iii) Subscriber carrier;
        (iv) Point-to-point radio (Microwave);
        (v) Coaxial cable system electronics;
        (vi) Fiber optic cable system electronics;
        (vii) Multiplex equipment;
        (viii) Mobile and fixed radiotelephone; and
        (ix) Other items of electronic equipment associated with transmission.
        (2) Central office equipment. The procedure set forth in Bulletin 384 - 1 ``Purchasing and Installing Central Office Equipment'' shall be followed except that ``The Central Office Equipment Contract (Including Installation)'', RUS Form 525, shall be used to purchase switching equipment for field trials. In addition, the borrower and supplier shall execute three copies of a ``Supplemental Agreement to Equipment Contract for Field Trial,'' RUS Form 399, or a ``Supplemental Agreement to Equipment Contract for Field Trial (Secondary -- Delivery, Installation, Operation)'', RUS Form 399a, as the case may be, as well as three copies of the RUS Form 399b, ``RUS Telecommunications Equipment Field Trial'', and forward them, together with three copies of the executed contract and specification to the Chief, Area Engineering Branch. This category includes:
        (i) Central office dial equipment;
        (ii) Direct distance dialing equipment;
        (iii) Automatic number identification equipment;
        (iv) Line concentrators;
        (v) Remote switching equipment; and
        (vi) All other items of equipment associated with switching equipment, such as loop extenders.
        (3) Protection equipment and materials, outside plant equipment and materials, and all other equipment and materials, which includes all items not covered in paragraph (j) (1) or (2) of this section, shall be handled as described in Bulletin 344 - 1 ``Methods of Purchasing Materials and Equipment for Use on Systems of Telephone Borrowers'' except that the borrower's purchase order form is to be used for purchasing materials and equipment in these categories. In addition, the borrower and supplier shall execute three copies of the ``Supplemental Agreement to Equipment Contract for Field Trial,'' RUS Form 399, or a ``Supplemental Agreement to Equipment Contract for Field Trial (Secondary -- Delivery, Installation, Operation)'', RUS Form 399a, as the case may be, as well as three copies of the RUS Form 399b, ``RUS Telecommunications Field Trial'', and forward them, together with three copies of the purchase order to the Chief, Area Engineering Branch.
        (k) For all items except Electronic Central Office Equipment, suppliers and manufacturers must furnish warranties or guarantees satisfactory to RUS against the failure of the material and equipment used in the field trial. Terms of this warranty must not be less than the provisions of the standard warranty included in the ``Telephone System Construction Contract'', RUS Form 515, or the warranty provided for similar materials and equipment included in the ``List of Materials Acceptable for Use on Telephone Systems of RUS Borrowers'', RUS Bulletin 344 - 2. In lieu of a warranty, materials and equipment are sometimes furnished to RUS borrowers on a reduced or no cost basis. Terms of such arrangements are subject to RUS approval and should be fully covered in field trial proposals forwarded by borrowers to the Chief, Area Engineering Branch for review and approval. For the purchase of electronic central office equipment, suppliers and manufacturers are to provide warranties as provided in the applicable RUS contract form: RUS Form 397 for electronic equipment and RUS Form 525 for central office equipment. Forms 399 and 399a, which apply to field trials of these devices, specify that the term of the warranty does not begin until the satisfactory conclusion of the field trial.
[49 FR 28394, July 12, 1984. Redesignated at 55 FR 39397, Sept. 27, 1990]
__1755.4 -- 1755.92 [Reserved]
_1755.93  List of standard forms of telecommunications contracts.
        Following is a list of the current standard forms of contracts that RUS prepared for use by telephone borrowers when procuring engineering and architectural services, purchasing telephone materials and equipment, and constructing telephone facilities with RUS loan funds. Copies of the contract forms are available from the sources indicated in the listing. A notice of any change in these contract forms will be published in the Federal Register. The terms ``RUS form'', ``RUS standard form'', ``RUS specification'', and ``RUS bulletin'' have the same meanings as the terms ``REA form'', ``REA standard form'', ``REA specification'', and ``REA
(TABLE START)bulletin'', respectively, unless otherwise indicated.
@h1RUS Form No.
@h1Issue date
@h1Title
@h1Purpose
@h1Source of copies
165 .... 9 - 69 .... Architectural Services Contract -- Telephone .... Used to engage the services of an architect .... RUS.\1\
168b .... 3 - 62 .... Contractor's Bond .... Used in RUS Form 515 when the contract exceeds $100,000 .... Copy in the Form 515 Contract.
168c .... 4 - 79 .... Contractor's Bond .... Used when the contractor's surety has accepted a Small Business Administration guarantee and the contract is for $1 million or less .... RUS.\1\
217 .... 7 - 81 .... Postloan Engineering Service Contract, Telephone System and Construction .... Used to engage the services of a consulting engineer to perform the postloan engineering services .... RUS.\1\
238 .... 4 - 72 .... Construction or Equipment Contract Amendment .... Amending the Building Contract RUS Form 257; Special Equipment Contracts, RUS Forms 397 and 398; Telephone Equipment Contract (Installation Only), RUS Form 400; Central Office Equipment Contracts, RUS Forms 525 and 545 .... RUS.\1\
242 .... 11 - 58 .... Assignment of Engineering Service Contract .... Used to transfer the responsibilities of completing the performance of the engineering service contract to another company .... RUS.\1\
245 .... 11 - 75 .... Engineering Service Contract, Special Services -- Telephone .... Used to engage a consulting engineer to perform special services .... RUS.\1\
257 .... 3 - 73 .... Contract to Construct Buildings .... Building construction .... Supt. of Doc., GPO, Wash., DC 20402.\2\
257a .... 10 - 69 .... Contractor's Bond .... Used in RUS Form 257 .... Copy in the Form 257 Contract.
270 .... 7 - 70 .... Equal Opportunity Addendum .... Addendum to Construction and Equipment Contracts not having current equal opportunity provisions .... RUS.\1\
282 .... 11 - 53 .... Subcontract .... Subcontracting a portion of construction under a construction contract requires approval of the borrower, surety and RUS prior to subcontracting .... RUS.\1\
307 .... 4 - 60 .... Bid Bond .... Bid proposals on RUS Forms 257, 515, and 525 require either a bid bond or a certified check in an amount equal to ten percent of the maximum bid price .... Copies in each of the contracts.
397 .... 12 - 67 .... Special Equipment Contract (Including Installation) .... Purchase and installation of voice frequency repeaters, trunk carrier, subscriber carrier, microwave, mobile radio, line concentrators, and other items of electronic equipment associated with transmission .... RUS.\1\
397f .... 2 - 63 .... Contractor's Bond (Special Telephone Equipment) .... Used in RUS Form 397 when the contract exceeds $100,000 .... Copy in the Form 397 Contract.
No form number .... 7 - 78 .... Addendum No. 1 to RUS Form 397, Special Equipment Contract (Including Installation) .... Incorporates the liquidated damages provision into the 397 contract .... RUS.\1\
398 .... 11 - 62 .... Special Equipment Contract (Not Incl. Installation) .... Purchase and deliver voice frequency repeaters, trunk carrier, subscriber carrier, microwave, mobile radio, line concentrators, and other items of electronic equipment associated with transmission .... RUS.\1\
399 .... 8 - 82 .... Supplemental Agreement to Equipment Contract for Field Trial .... Used in any contract that contains material or equipment that requires a field trial and has primary status .... RUS.\1\
399a .... 8 - 82 .... Supplemental Agreement to Equipment Contract for Field Trial (Secondary -- Delivery, Installation, Operation) .... Used in any contract that contains material or equipment that requires a field trial and is the secondary field trial category .... RUS.\1\
400 .... 10 - 65 .... Telephone Equipment Contract (Installation Only) .... Used where the contract will cover only the installation of equipment .... RUS.\1\
400a .... 10 - 65 .... Contractor's Bond (Telephone Equipment Contract -- Installation Only) .... Used in RUS Form 400 when the contract exceeds $100,000 .... Copy in the Form 400 Contract.
515 .... 1 - 90 .... Telephone System Construction Contract (Labor and Materials) .... Telephone outside plant construction, including direct buried plant, conduit and manholes, underground cable, pole lines, aerial cable, service entrances and station protector .... Supt. of Doc., GPO, Wash DC 20402.\2\
525  .... 7 - 94  .... Central Office Equipment Contract (Including Installation)  .... Purchase and Installation of central office switching equipment  .... RUS.\1\
525a .... 10 - 62 .... Contractor's Bond (Central Office Equipment) .... Used in RUS Form 525 when the contracts exceed $100,000 .... Copy in the Form 525 Contract.
No form number .... 8 - 79 .... Addendum No. 1 to RUS Form 525, Central Office Equipment Contract (Including Installation) .... Incorporates the liquidated damages provision into the 525 contract .... RUS.\1\
526 .... 8 - 66 .... Construction Contract Amendment .... Amending the Telephone System Construction Contract (Labor and Material), RUS Form 515 .... RUS.\1\
545 .... 9 - 66 .... Central Office Equipment Contract (Not Including Installation) .... Purchase and deliver central office equipment .... RUS.\1\
756 .... 3 - 63 .... Telephone Line Extension Construction Contract (Labor and Materials)  .... Construction of system improvements and line extensions where scope of the project is not known .... RUS.\1\
773 .... 12 - 90 .... Miscellaneous Construction Work and Maintenance Service Contract.  .... Minor construction by contract and maintenance and repair of telephone system facilities. .... RUS.\1\
787 .... 8 - 63 .... Supplement A to Construction Contract RUS Form 515 .... Used in RUS Form 515 when borrower furnishes any material for construction of the project .... RUS.\1\
No form number .... 5 - 94  .... Addendum No. 2 to RUS Forms 525 and 545 Central Office Equipment Contracts  .... Incorporates the Software License Agreement into RUS Forms 525 and 545  .... RUS.\1\
Footnote: \1\A limited number of copies of the publication will be furnished by RUS upon request. As this document is produced by the Federal Government and is, therefore, in the public domain, additional copies may be duplicated locally by any user as desired. Requests for copies should be sent the Director, Administrative Services Division, U.S. Department of Agriculture, Rural Utilities Service, Washington, DC 20250. The telephone number of the RUS Publication Office is (202) 720 - 8674.
Footnote: \2\This contract form is for sale by the Superintendent of Documents, Government Printing Office, Washington, DC 20402. RUS Form 33, Order Blank for RUS Contract Forms from the Government Printing Office should be used to order the publication. Follow the procedure under (\1\) to obtain copies of Form 33 from RUS.
(TABLE END)
[53 FR 15546, May 2, 1988; as amended at 55 FR 2510, Jan. 25, 1990. Redesignated at 55 FR 39397, Sept. 27, 1990, as amended at 56 FR 1484, Jan. 15, 1991; 59 FR 17681, Apr. 14, 1994; 59 FR 31126, June 17, 1994; 59 FR 66440, Dec. 27, 1994]
__1755.94 -- 1755.96 [Reserved]
_1755.97  Incorporation by reference of telephone standards and specifications.
        The following telephone Bulletins have been approved for incorporation by reference by the Director of the Office of the Federal Register on December 30, 1983. Bulletin 345 - 150 (Form 515a) containing the specifications and drawings for construction of buried cables and wires may be purchased from the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402. The remaining Bulletins containing construction standards and specifications for materials and equipment may be obtained from the Rural Utilities Service, Administrative Services Division, Room 0175 - S, Washington, DC 20250. The bulletins are available for inspection at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. These materials are incorporated as they exist on the date of the approval and a notice of any change in these materials will be published in the Federal Register. The terms ``RUS form'', ``RUS standard form'', ``RUS specification'', and ``RUS bulletin'' have the same meanings as the terms ``REA form'', ``REA standard form'', ``REA specification'', and ``REA
(TABLE START)bulletin'', respectively, unless otherwise indicated.
@h1RUS Bulletin No.
@h1Specification No.
@h1Date last issued
@h1Title of standard or specification
345 - 22  .... PE - 26  .... Jan. 1989  .... RUS specification for voice frequency loading coils.
345 - 39  ....   .... Aug. 19, 1985  .... RUS specification for telephone station protectors.
345 - 50 .... PE - 60 .... Sept. 1979 .... RUS specification for trunk carrier systems.
345 - 52 .... PC - 5A .... Jan. 1980 .... RUS standard for service entrance and station protector installations.
345 - 54 .... PE - 52 .... Dec. 1971 .... RUS specification for telephone cable splicing connectors.
345 - 55 .... PE - 61 .... Dec. 1973 .... RUS specification for central office loop extenders and loop extender voice frequency repeater combinations.
345 - 63 .... PC - 4 .... May 1976 .... RUS standard for acceptance tests and measurements of telephone plant.
345 - 65 .... PE - 65 .... Mar. 22, 1985 .... Specification for shield bonding connectors.
345 - 66 .... PE - 64 .... Sept. 1979 .... RUS specification for subscriber carrier systems.
345 - 69 .... PE - 29 .... Jan. 1978 .... RUS specification for two-wire voice frequency repeater equipment.
345 - 72 .... PE - 74 .... Oct. 1985 .... RUS specification for filled splice closures.
345 - 78 .... PE - 78 .... Feb. 1980 .... RUS specification for carbon arrester assemblies for use in protectors.
345 - 150  .... Form 515a  .... July 1989 .... RUS specifications and drawings for construction of direct buried plant.
345 - 151  .... Form 515c  .... July 1989 .... RUS specifications and drawings for conduit and manhole construction.
345 - 152  .... Form 515d  .... July 1989 .... RUS specifications and drawings for underground cable installation.
345 - 153  .... Form 515f  .... July 1989 .... RUS specifications and drawings for construction of pole line and aerial cables.
345 - 154  .... Form 515g  .... July 1989 .... RUS specifications and drawings for service entrance and station protection installation.
345 - 180 .... Form 397a .... Jan. 1963 .... RUS specifications for voice frequency repeaters and voice frequency repeatered trunks.
345 - 183 .... Form 397d .... June 1970 .... RUS design specifications for point-to-point microwave radio systems.
345 - 184 .... Form 397e .... May 1971 .... RUS design specifications for mobile and fixed dial radio telephone equipment.
1728F - 700  ....   .... 9-2-93  .... RUS Specification for Wood Poles, Stubs and Anchor Logs
(TABLE END)
[48 FR 57470, Dec. 30, 1983]
Editorial Note: For Federal Register citations affecting _1755.97, see the List of CFR Sections Affected in the Finding Aids section of this volume.
_1755.98   List of telephone standards and specifications included in other 7 CFR parts.
        The following standards and specifications are included throughout 7 CFR chapter XVII. These standards and specifications are not incorporated by reference elsewhere in the chapter. The terms ``RUS form'', ``RUS standard form'', ``RUS specification'', and ``RUS bulletin'' have the same meanings as the terms ``REA form'', ``REA standard form'', ``REA specification'', and
(TABLE START)``REA bulletin'', respectively, unless otherwise indicated.
@h1Section
@h1Issue date
@h1Title
        1728.202  .... 9 - 2 - 93  .... RUS Specification for Quality Control and Inspection of Timber Products.
1755.200  .... 1 - 26 - 95  .... RUS Standard for Splicing Copper and Fiber Optic Cables.
        1755.370  .... 1 - 19 - 90  .... RUS Specification for Seven Wire Galvanized Steel Strand.
1755.390  .... 6 - 21 - 93  .... RUS Specification for Filled Telephone Cables.
        1755.397  .... 3 - 6 - 90  .... RUS Design Specification for Digital Lightwave Transmission Systems, RUS Form 397h.
1755.522  .... 6 - 28 - 93  .... RUS General Specification for Digital, Stored Program Controlled Central Office Equipment.
1755.525  .... 7 - 18 - 94  .... RUS Form 525, Central Office Equipment Contract (Including Installation).
1755.860  .... 12 - 20 - 93  .... RUS Specification for Filled Buried Wires.
1755.870  .... 7 - 14 - 94  .... RUS Specification for Terminating Cables.
1755.890  .... 6 - 21 - 93  .... RUS Specification for Filled Telephone Cables with Expanded Insulation.
1755.900  .... 8 - 4 - 94  .... RUS Specification for Filled Fiber Optic Cables.
        1755.910  .... 11 - 21 - 94  .... RUS Specification for Outside Plant Housings and Serving Area Interface Systems.
(TABLE END)
[58 FR 41410, Aug. 3, 1993, as amended at 59 FR 53044, Oct. 21, 1994; 59 FR 66440, Dec. 27, 1994; 60 FR 1712, Jan. 5, 1995; 60 FR 5097, Jan. 26, 1995]
__1755.99 -- 1755.199 [Reserved]
_1755.200  RUS standard for splicing copper and fiber optic cables.
        (a) Scope. (1) This section describes approved methods for splicing plastic insulated copper and fiber optic cables. Typical applications of these methods include aerial, buried, and underground splices.
        (2) American National Standard Institute/National Fire Protection Association (ANSI/NFPA) 70, 1993 National Electrical Code (NEC) referenced in this section is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. A copy of the ANSI/NFPA 1993 NEC standard is available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from NFPA, Batterymarch Park, Quincy, Massachusetts 02269, telephone number 1 (800) 344 - 3555.
        (3) American National Standard Institute/Institute of Electrical and Electronics Engineers, Inc. (ANSI/IEEE), 1993 National Electrical Safety Code (NESC) referenced in this section is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. A copy of the ANSI/IEEE 1993 NESC standard is available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from IEEE Service Center, 455 Hoes Lane, Piscataway, New Jersey 08854, telephone number 1 (800) 678 - 4333.
        (b) General. (1) Only Rural Utilities Service (RUS) accepted filled cable and splicing materials shall be used on outside plant projects financed by RUS.
        (2) The installation instructions provided by the manufacturer of splicing materials shall be followed except where those instructions conflict with the procedures specified in this section.
        (3) Precautions shall be taken to prevent the ingress of moisture and other contaminants during all phases of the splicing installation. When an uncompleted splice must be left unattended, it shall be sealed to prevent the ingress of moisture and other contaminants.
        (4) Minor sheath damage during construction may be repaired if the repair is completed immediately and approved by the borrower's resident project representative. Minor damage is typically repaired by:
        (i) Scuffing the cable sheath associated with the damaged area;
        (ii) Applying several layers of DR tape over the scuffed and damaged area;
        (iii) Applying several layers of plastic tape over the DR tape; and
        (iv) If damage is severe enough to rupture the cable shield, a splice closure shall be installed.
        (5) All splice cases installed on RUS toll trunk and feeder cables shall be filled, whether aerial, buried, or underground.
        (c) Splicing considerations for copper cables -- (1) Preconstruction testing. It is desirable that each reel of cable be tested for grounds, opens, shorts, crosses, and shield continuity before the cable is installed. However, manufacturer supplied test results are acceptable. All cable pairs shall be free from electrical defects.
        (2) Handling precautions. The cable manufacturer's instructions concerning pulling tension and bending radius shall be observed. Unless the cable manufacturer's recommendation is more stringent, the minimum bending radius shall be 10 times the cable diameter for copper cables and 20 times the cable diameter for fiber optic cables.
        (3) Cable sheath removal. (i) The length of cable sheath to be removed shall be governed by the type of splicing hardware used. Follow the splice case manufacturer's recommendations. For pedestals or large pair count splice housings, consider removing enough cable sheath to allow the conductors to extend to the top of the pedestal and then to hang downward to approximately 15 centimeters (cm) (6 inches (in.)) above the baseplate.
        (ii) Caution shall be exercised to avoid damaging the conductor insulation when cutting through the cable shield and removing the shield. Sharp edges and burrs shall be removed from the cut end of the shield.
        (4) Shield bonding and grounding. For personnel safety, the shields of the cables to be spliced shall be bonded together and grounded before splicing activities are started. (See paragraphs (g)(2), and (g)(5)(i) through (g)(5)(iii) of this section for final bonding and grounding provisions.)
        (5) Binder group identification. (i) Color coded plastic tie wraps shall be placed loosely around each binder group of cables before splicing operations are attempted. The tie wraps shall be installed as near the cable sheath as practicable and shall conform to the same color designations as the binder ribbons. Twisted wire pigtails shall not be used to identify binder groups due to potential transmission degradation.
        (ii) The standard insulation color code used to identify individual cable pairs within 25-pair binder groups shall be as shown in Table
(TABLE START)1:
Table 1. -- Cable Pair Identification Within Binder Groups
@h1Pair No.
@h1Color@h2Tip@h2Ring
1  .... White  .... Blue.
2  .... White  .... Orange.
3  .... White  .... Green.
4  .... White  .... Brown.
5  .... White  .... Slate.
6  .... Red  .... Blue.
7  .... Red  .... Orange.
8  .... Red  .... Green.
9  .... Red  .... Brown.
10  .... Red  .... Slate.
11  .... Black  .... Blue.
12  .... Black  .... Orange.
13  .... Black  .... Green.
14  .... Black  .... Brown.
15  .... Black  .... Slate.
16  .... Yellow  .... Blue.
17  .... Yellow  .... Orange.
18  .... Yellow  .... Green.
19  .... Yellow  .... Brown.
20  .... Yellow  .... Slate.
21  .... Violet  .... Blue.
22  .... Violet  .... Orange.
23  .... Violet  .... Green.
24  .... Violet  .... Brown.
25  .... Violet  .... Slate.
(TABLE END)
        (iii) The standard binder ribbon color code used to designate 25-
(TABLE START)pair binder groups within 600-pair super units shall be as shown in Table 2:
Table 2. -- Cable Binder Group Identification
@h1Group No.
@h1Color of bindings
@h1Group pair count
1  .... White-Blue  .... 1 - 25
2  .... White-Orange  .... 26 - 50
3  .... White-Green  .... 51 - 75
4  .... White-Brown  .... 76 - 100
5  .... White-Slate  .... 101 - 125
6  .... Red-Blue  .... 126 - 150
7  .... Red-Orange  .... 151 - 175
8  .... Red-Green  .... 176 - 200
9  .... Red-Brown  .... 201 - 225
10  .... Red-Slate  .... 226 - 250
11  .... Black-Blue  .... 251 - 275
12  .... Black-Orange  .... 276 - 300
13  .... Black-Green  .... 301 - 325
14  .... Black-Brown  .... 326 - 350
15  .... Black-Slate  .... 351 - 375
16  .... Yellow-Blue  .... 376 - 400
17  .... Yellow-Orange  .... 401 - 425
18  .... Yellow-Green  .... 426 - 450
19  .... Yellow-Brown  .... 451 - 475
20  .... Yellow-Slate  .... 476 - 500
21  .... Violet-Blue  .... 501 - 525
22  .... Violet-Orange  .... 526 - 550
23  .... Violet-Green  .... 551 - 575
24  .... Violet-Brown  .... 576 - 600
(TABLE END)
        (iv) Super-unit binder groups shall be identified in accordance
(TABLE START)with Table 3:
Table 3. -- Super-Unit Binder Colors
@h1Pair numbers
@h1Binder color
1 - 600  .... White.
601 - 1200  .... Red.
1201 - 1800  .... Black.
1801 - 2400  .... Yellow.
2401 - 3000  .... Violet.
3001 - 3600  .... Blue.
3601 - 4200  .... Orange.
4201 - 4800  .... Green.
4801 - 5400  .... Brown.
5401 - 6000  .... Slate.
(TABLE END)
        (v) Service pairs in screened cables shall be identified in
(TABLE START)accordance with Table 4:
Table 4. -- Screened Cable Service Pair Identification
@h1Service pair No.
@h1Color @h2Tip@h2Ring
1  .... White  .... Red.
2  .... White  .... Black.
3  .... White  .... Yellow.
4  .... White  .... Violet.
  .... Red  .... Black.
6  .... Red  .... Yellow.
7  .... Red  .... Violet.
8  .... Black  .... Yellow.
9  .... Black  .... Violet.
(TABLE END)
        (6) Cleaning conductors. It is not necessary to remove the filling compound from cable conductors before splicing. However, it is permissible to wipe individual conductors with clean paper towels or clean cloth rags. No cleaning chemicals, etc., shall be used. Caution shall be exercised to maintain individual cable pair and binder group identity. Binder group identity shall be maintained by using color coded plastic tie wraps. Individual pair identification shall be maintained by carefully twisting together the two conductors of each pair.
        (7) Expanded plastic insulated conductor (PIC) precautions. Solid PIC and expanded (foam or foam skin) PIC are spliced in the same manner, using the same tools and materials and, in general, should be treated the same. However, the insulation on expanded PIC is much more fragile than solid PIC. Twisting or forming expanded PIC into extremely compact splice bundles and applying excessive amounts of tension when tightening tie wraps causes shiners and, thus shall be avoided.
        (8) Splice connectors. (i) Only RUS accepted filled splice connectors shall be used on outside plant projects financed by RUS.
        (ii) Specialized connectors are available for splicing operations such as butt splices, in line splices, bridge taps, clearing and capping, and multiple pair splicing operations. The splice connector manufacturer's recommendations shall be followed concerning connector selection and use.
        (iii) Caution shall be exercised to maintain conductor and pair association both during and after splicing operations.
        (iv) Splicing operations that involve pairs containing working services shall utilize splice connectors that permit splicing without the interruption of service.
        (9) Piecing out conductors. Conductors may be pieced-out to provide additional slack or to repair damaged conductors. However, the conductors shall be pieced-out with conductors having the same gauge and type and color of insulation. The conductors used for piecing-out shall be from cables having RUS acceptance.
        (10) Splice organization. Spliced pair bundles shall be arranged in firm lay-ups with minimum conductor tension in accordance with the manufacturer's instructions.
        (11) Binder tape. Perforated nonhygroscopic and nonwicking binder tape should be applied to splices housed in filled splice cases. The binder tape allows the flow of filling compound while holding the splice bundles near the center of the splice case to allow adequate coverage of filling compound.
        (12) Cable tags. Cables shall be identified by a tag indicating the cable manufacturer's name, cable size, date of placement, and generic route information. Information susceptible to changes caused by future cable throws and rearrangements should not be included. Tags on load coil stubs shall include the serial number of the coil case, the manufacturer's name, and the inductance value.
        (13) Screened cable. Screened PIC cable is spliced in the same manner as nonscreened PIC cable. However, special considerations are necessary due to differences in the cable design. The transmit and receive bundles of the cable shall be separated and one of the bundles shall be wrapped with shielding material in accordance with the cable manufacturer's recommendations. When acceptable to the cable manufacturer, it is permissible to use either the scrap screening tape removed from the cable during the sheath opening process provided the screening tape is edge coated or new pressure sensitive aluminum foil tape over polyethylene tape.
        (14) Service wire connections. (i) Buried service wires may be spliced directly to cable conductors inside pedestals using the same techniques required for branch cables. Buried service wires may also be terminated on terminal blocks inside pedestals in areas where high service order activity or fixed count cable administration policies require terminal blocks. However, only RUS accepted terminal blocks equipped with grease or gel filled terminations to provide moisture and corrosion resistance shall be used.
        (ii) Only filled terminal blocks having RUS acceptance shall be used on aerial service wire connections.
        (15) Copper cable testing. Copper cable testing shall be performed in accordance with RUS Bulletin 345 - 63, ``RUS Standard for Acceptance Tests and Measurements of Telephone Plant,'' PC - 4, (Incorporated by reference at _1755.97).
        (16) Cable acceptance. Installed cable shall be tested and pass the inventory and acceptance testing specified in the Telephone System Construction Contract (Labor and Materials), RUS Form 515. The tests and inspections shall be witnessed by the borrower's resident project representative. All conductors shall be free from grounds, shorts, crosses, splits, and opens.
        (d) Splice arrangements for copper cables -- (1) Service distribution closures. (i) Ready access closures permit cable splicing activities and the installation of filled terminal blocks for service wire connections in the same closure. Ready access designs shall allow service technicians direct access to the cable core as well as the terminal block.
        (ii) Fixed count terminals shall restrict service technician access to the cable core. Predetermined cable pairs shall be spliced to the terminal leads or stub cable in advance of service assignments.
        (2) Aerial splices. Aerial splice cases accommodate straight splices, branch splices, load coils, and service distribution terminals. Aerial splicing arrangements having more than 4 cables spliced in the same splice case are not recommended. Stub cabling to a second splice case to avoid a congested splice is acceptable.
        (3) Buried splices. (i) Direct buried splice cases accommodate straight splices, branch splices, and load coils. Direct buried splices shall be filled and shall be used only when above ground splicing in pedestals is not practicable.
        (ii) A treated plank or equivalent shall be placed 15 cm (6 in.) above the buried splice case to prevent damage to the splice case from future digging. Where a firm base for burying a splice cannot be obtained, a treated plank or equivalent shall be placed beneath the splice case.
        (iii) Each buried splice shall be identified for future locating. One method of marking the splice point is the use of a warning sign. Another method is the burying of an electronic locating device.
        (4) BD-type pedestals. (i) BD-type pedestals are housings primarily intended to house, organize, and protect cable terminations incorporating splice connectors, ground lugs, and load coils. Activities typically performed in pedestals are cable splicing, shield bonding and grounding, loading, and connection of subscriber service drops.
        (ii) The recommended splice capacities for BD-type pedestals are shown in Table 5. However, larger size pedestals are permissible if service
(TABLE START)requirements dictate their usefulness. Table 5 is as follows:
Table 5. -- Splice Capacities for BD-Type Pedestals
@h1Pedestal type
@h1Maximum straight splice pair capacity using single pair connectors or multiple pair splice modules
@h1Maximum load splice pair capacity using single pair connectors or multiple pair splice modules (see note 1)
BD3, BD3A  .... 100 Pair  .... 50 Pair.
BD4, BD4A  .... 200 Pair  .... 100 Pair.
BD5, BD5A  .... 600 Pair  .... 300 Pair.
BD7  .... 1200 Pair  .... 600 Pair.
BD14, BD14A  .... 100 Pair  .... 50 Pair.
BD15, BD15A  .... 400 Pair  .... 200 Pair.
BD16, BD16A  .... 600 Pair  .... 300 Pair.
Footnote: Note 1: This table refers to load coil cases that are to be direct buried with stub cables extending into the pedestal for splicing. Requirements involving individual coil arrangements inside the pedestal should be engineered on a case-by-case basis.
(TABLE END)
        (iii) Special distribution pedestals having a divider plate for mounting filled terminal blocks are available. Distribution pedestals are also equipped with service wire channels for installation of buried service wires without disturbing the cabling and gravel inside the base of the pedestal. Distribution pedestals are recommended in locations where the connection of service wires is required.
        (5) Large pair count splice housings. Large pair count splice housings are recommended for areas not suitable for man- holes. The
(TABLE START)recommended capacities are shown in Table 6:
Table 6. -- Splice Capacities for Large Count Housings
@h1Housing type
@h1Maximum straight splice pair capacity using single pair connectors or multiple pair splice modules
@h1Maximum load splice pair capacity using single pair connectors or multiple pair splice modules (see note 1)
BD 6000 .... 6,000 Pair .... 3,000 Pair.
BD 8000 .... 8,000 Pair .... 4,000 Pair.
BD 10000 .... 10,000 Pair .... 5,000 Pair.
(TABLE END)
        (6) Pedestal restricted access inserts. Restricted access inserts may be used to protect splices susceptible to unnecessary handling where subsequent work activities are required or expected to occur after splices have been completed. Restricted access inserts also provide moisture protection in areas susceptible to temporary flooding. A typical restricted access insert is shown in Figure 1:
E:\GRAPHICS\ER26JA95.002
        (7) Serving Area Interface (SAI) Systems. SAI systems provide the cross-connect point between feeder and distribution cables. Connection of feeder to distribution pairs is accomplished by placing jumpers between connecting blocks. Only RUS accepted connecting blocks having grease or gel filled terminations to provide moisture and corrosion resistance shall be used.
        (8) Buried cable splicing arrangements. Typical buried cable splicing arrangements are illustrated in Figures 2 through 5:
E:\GRAPHICS\ER26JA95.003
E:\GRAPHICS\ER26JA95.004
E:\GRAPHICS\ER26JA95.005
E:\GRAPHICS\ER26JA95.006
        (9) Underground splices (manholes). Underground splice cases accommodate straight splices, branch splices, and load coils. Underground splices shall be filled.
        (10) Central office tip cable splices. (i) Filled cable or filled splices are not recommended for use inside central offices, except in cable vault locations. Outside plant cable sheath and cable filling compound are susceptible to fire and will support combustion. Fire, smoke, and gases generated by these materials during burning are detrimental to telephone switching equipment.
        (ii) Tip cables should be spliced in a cable vault. However, as a last resort, tip cables may be spliced inside a central office if flame retardant splice cases or a noncombustible central office splice housing is used to contain the splice.
        (iii) Splices inside the central office shall be made as close as practical to the point where the outside plant cables enter the building. Except in cable vault locations, outside plant cables within the central office shall be wrapped with fireproof tape or enclosed in noncombustible conduit.
        (e) Splicing considerations for fiber optic cables -- (1) Connection characteristics. Splicing efficiency between optical fibers is a function of light loss across the fiber junctions measured in decibels (dB). A loss of 0.2 dB in a splice corresponds to a light transmission efficiency of approximately 95.5 percent.
        (2) Fiber core alignment. Fiber splicing techniques shall be conducted in such a manner that the cores of the fibers will be aligned as perfectly as possible to allow maximum light transmission from one fiber to the next. Without proper alignment, light will leave the fiber core and travel through the fiber cladding. Light outside the fiber core is not a usable light signal. Core misalignment is illustrated in Figure 6:
E:\GRAPHICS\ER26JA95.007
        (3) Splice loss. (i) Splice loss can also be caused by fiber defects such as nonidentical core diameters, cores not in center of the fiber, and noncircular cores. Such defects are depicted in Figure 7:
E:\GRAPHICS\ER26JA95.008
        (ii) Undesirable splice losses are caused by poor splicing techniques including splicing irregularities such as improper cleaves and dirty splices. Typical cleave problems are illustrated in Figure 8:
E:\GRAPHICS\ER26JA95.009
        (4) Handling precautions. The following precautions shall be observed:
        (i) Avoid damaging the cable during handling operations prior to splicing. Minor damage may change the transmission characteristics of the fibers to the extent that the cable section will have to be replaced;
        (ii) The cable manufacturer's recommendations concerning pulling tension shall be observed. The maximum pulling tension for most fiber optic cable is 2669 newtons (600 pound-force);
        (iii) The cable manufacturer's recommendations concerning bending radius shall be observed. Unless the cable manufacturer's recommendation is more stringent, the minimum bending radius for fiber optic cable shall be 20 times the cable diameter;
        (iv) The cable manufacturer's recommendations concerning buffer tube bending radius shall be observed. Unless the cable manufacturer's recommendation is more stringent, the minimum bending radius for buffer tubes is usually between 38 millimeters (mm) (1.5 in.) and 76 mm (3.0 in.). The bending limitations on buffer tubes are intended to prevent kinking. Buffer tube kinking may cause excessive optical loss or fiber breakage; and
        (v) Handle unprotected glass fibers carefully to avoid introducing flaws such as scratched or broken fibers.
        (5) Personnel safety. The following safety precautions shall be observed:
        (i) Safety glasses shall be worn when handling glass fibers;
        (ii) Never view open-ended fibers with the naked eye or a magnifying device. Improper viewing of a fiber end that is transmitting light may cause irreparable eye damage; and
        (iii) Dispose of bare scrap fibers by using the sticky side of a piece of tape to pick up and discard loose fiber ends. Fiber scraps easily penetrate the skin and are difficult to remove.
        (6) Equipment requirements. (i) Fiber optic splices shall be made in areas where temperature, humidity, and cleanliness can be controlled. Both fusion and mechanical splicing techniques may require a splicing vehicle equipped with a work station that will allow environmental control.
        (ii) Both fusion and mechanical splicing techniques are permitted on RUS financed projects. When using the mechanical splicing technique, only RUS accepted mechanical fiber optic splice connectors can be used.
        (iii) Fusion splicing machines shall be kept in proper working condition. Regular maintenance in accordance with the machine manufacturer's recommendations shall be observed.
        (iv) Mechanical splicing tools shall be in conformance with the tool manufacturer's recommendations.
        (v) An optical time domain reflectometer (OTDR) shall be used for testing splices. The OTDR shall be stationed at the central office or launch point for testing individual splices as they are made and for end-to-end signature tests for the fiber optic link.
        (vi) An optical power meter shall be used for end-to-end cable acceptance tests.
        (vii) A prerequisite for the successful completion of a fiber optic splicing endeavor is the presence of a talk circuit between the splicing technician in the splicing vehicle and the operator of the OTDR in the central office. The splicing technician and the OTDR operator shall have access to communications with each other in order to inform each other as to:
        (A) Which splices meet the loss objectives;
        (B) The sequence in which buffer tubes and fibers are to be selected for subsequent splicing operations; and
        (C) The timing required for the performance of OTDR testing to prevent making an OTDR test at the same time a splice is being fused.
        (7) Cable preparation. (i) Engineering work prints shall prescribe the cable slack needed at splice points to reach the work station inside the splicing vehicle. Consideration should be given to the slack required for future maintenance activity as well as initial construction activities. The required slack may be different for each splice point, depending on the site logistics. However, the required slack is seldom less than 15 meters (50 feet). The amount of slack actually used shall be recorded for each splice point to assist future maintenance and restoration efforts.
        (ii) The splice case manufacturer's recommendations concerning the amount of cable sheath to be removed shall be followed to facilitate splicing operations. The length of the sheath opening shall be identified with a wrap of plastic tape.
        (iii) If the cable contains a rip cord, the cable jacket shall be ring cut approximately 15 cm (6 in.) from the end and the 15 cm (6 in.) of cable jacket shall be removed to expose the rip cord. The rip cord shall be used to slit the jacket to the tape mark.
        (iv) If the cable does not contain a rip cord, the cable jacket shall be slit using a sheath splitter. No cuts shall be made into the cable core nor shall the buffer tubes be damaged.
        (v) If the cable contains an armor sheath, the outer jacket shall be opened along the slit and the jacket shall be removed exposing the armor sheath. The armor shall be separated at the seam and pulled from the cable exposing the inner jacket. The armor shall be removed making allowances for a shield bond connector. The inner sheath shall be slit using a sheath splitter or rip cord. The cable core shall not be damaged nor shall there be any damage to the buffer tubes. The jacket shall be peeled back and cut at the end of the slit. The exposed buffer tubes shall not be cut, kinked, or bent.
        (vi) After the cable sheath has been removed, the binder tape shall be removed from the cable. The cable shall not be crushed or deformed.
        (vii) The buffer tubes shall be unstranded one at a time. The buffer tubes shall not be kinked.
        (viii) If the cable is equipped with a strength member, the strength member shall be cut to the length recommended by the splice case manufacturer.
        (ix) Each buffer tube shall be inspected for kinks, cuts, and flat spots. If damage is detected, an additional length of cable jacket shall be removed and all of the buffer tubes shall be cut off at the point of damage.
        (x) The cable preparation sequence shall be repeated for the other cable end.
        (8) Shield bonding and grounding. For personnel safety, the shields and metallic strength members of the cables to be spliced shall be bonded together and grounded before splicing activities are started. (See paragraphs (g)(4), and (g)(5)(i) through (g)(5)(iii) of this section for final bonding and grounding provisions).
        (9) Fiber optic color code. The standard fiber optic color
(TABLE START)code for buffer tubes and individual fibers shall be as shown in Table 7:
Table 7. -- Fiber and Buffer Tube Identification
@h1Buffer tube and fiber No.
@h1Color
 1  .... Blue.
 2  .... Orange.
 3  .... Green.
 4  .... Brown.
 5  .... Slate.
 6  .... White.
 7  .... Red.
 8  .... Black.
 9  .... Yellow.
10  .... Violet.
11  .... Rose.
12  .... Aqua.
13  .... Blue/Black Tracer.
14  .... Orange/Black Tracer.
15  .... Green/Black Tracer.
16  .... Brown/Black Tracer.
17  .... Slate/Black Tracer.
18  .... White/Black Tracer.
19  .... Red/Black Tracer.
20  .... Black/Yellow Tracer.
21  .... Yellow/Black Tracer.
22  .... Violet/Black Tracer.
23  .... Rose/Black Tracer.
24  .... Aqua/Black Tracer.
(TABLE END)
        (10) Buffer tube removal. (i) The splice case manufacturer's recommendation shall be followed concerning the total length of buffer tube to be removed. Identify the length to be removed with plastic tape.
        (ii) Experiment with a scrap buffer tube to determine the cutting tool adjustment required to ring cut a buffer tube without damaging the fibers.
        (iii) Buffer tubes shall be removed by carefully ring cutting and removing approximately 15 to 46 cm (6 to 18 in.) of buffer tube at a time. The process shall be repeated until the required length of buffer tube has been removed, including the tape identification marker.
        (11) Coated fiber cleaning. (i) Each coated fiber shall be cleaned. The cable manufacturer's recommendations shall be followed concerning the solvent required to clean the coated fibers. Reagent grade isopropyl alcohol is a commonly used cleaning solvent.
        (ii) A tissue or cotton ball shall be soaked in the recommended cleaning solvent and the coated fibers shall be carefully wiped one at a time using a clean tissue or cotton ball for each coated fiber. Caution shall be exercised to avoid removing the coloring agent from the fiber coating.
        (12) Fiber coating removal. (i) Fiber coatings shall be removed. In accordance with the splicing method used, the splice case manufacturer's recommendation shall be followed concerning the length of fiber coating to be removed.
        (ii) The recommended length of fiber coating shall be removed only on the two fibers to be spliced. Fiber coating removal shall be performed on a one-fiber-at-a-time basis as each splice is prepared.
        (13) Bare fiber cleaning. After the fiber coating has been removed, the bare fibers shall be cleaned prior to splicing. Each fiber shall be wiped with a clean tissue or cotton ball soaked with the cleaning solvent recommended by the cable manufacturer. The bare fiber shall be wiped one time to minimize fiber damage. Aggressive wiping of bare fiber shall be avoided as it lowers the fiber tensile strength.
        (14) Fiber cleaving. Cleaving tools shall be clean and have sharp cutting edges to minimize fiber scratches and improper cleave angles. Cleaving tools that are recommended by the manufacturer of the splicing system shall be used.
        (15) Cleaved fiber handling. The cleaved and cleaned fiber shall not be allowed to touch other objects and shall be inserted into the splicing device.
        (16) Completion of the splice. (i) In accordance with the method of splicing selected by the borrower, the splice shall be completed by either fusing the splice or by applying the mechanical connector.
        (ii) Each spliced fiber shall be routed through the organizer tray one at a time as splices are completed. The fibers shall be organized one at a time to prevent tangled spliced fibers. The splice case manufacturer's recommendation shall be followed concerning the splice tray selection.
        (17) Fiber optic testing. Fiber optic testing shall be performed in accordance with RUS Bulletin 345 - 63, ``RUS Standard for Acceptance Tests and Measurements of Telephone Plant,'' PC - 4, (Incorporated by reference at _1755.97).
        (18) Cable acceptance. Installed cable shall be tested and pass the inventory and acceptance testing specified in the Telephone System Construction Contract (Labor and Materials), RUS Form 515. The tests and inspections shall be witnessed by the borrower's resident project representative.
        (f) Splice arrangements for fiber optic cables -- (1) Aerial splices. Cable slack at aerial splices shall be stored either on the messenger strand, on the pole, or inside a pedestal at the base of the pole. A typical arrangement for the storage of slack cable at aerial splices is shown in Figure 9:
E:\GRAPHICS\ER26JA95.010
        (2) Buried splices. Buried splices shall be installed in handholes to accommodate the splice case and the required splicing slack. An alternative to the handhole is a pedestal specifically designed for fiber optic splice cases. Typical arrangements for buried cable splices are shown in Figures 10 and 11:
E:\GRAPHICS\ER26JA95.011
E:\GRAPHICS\ER26JA95.012
        (3) Underground manhole splices. Underground splices shall be stored in manholes on cable hooks and racks fastened to the manhole wall. The cable slack shall be stored on cable hooks and racks as shown in Figure 12:
E:\GRAPHICS\ER26JA95.013
        (4) Central office cable entrance. (i) Filled cable or filled splices are not recommended for use inside central offices except in cable vault locations. Outside plant cable sheath and cable filling compound are susceptible to fire and will support combustion. Fire, smoke, and gases generated by these materials during burning are detrimental to telephone switching equipment.
        (ii) As a first choice, the outside plant fiber optic cable shall be spliced to an all-dielectric fire retardant cable in a cable vault with the all-dielectric cable extending into the central office and terminating inside a fiber patch panel.
        (iii) As a second choice, the outside plant cable may be spliced inside the central office if a flame retardant fiber optic splice case or a noncombustible central office splice housing equipped with organizer trays is used to contain the splice.
        (iv) In cases referenced in paragraphs (f)(4)(ii) and (f)(4)(iii) of this section, as a minimum the fire retardant all-dielectric cable used to provide the connection between the cable entrance splice and the fiber patch panel shall be listed as Communication Riser Cable (Type CMR) in accordance with Sections 800 - 50 and 800 - 51(b) of the 1993 National Electrical Code.
        (v) Splices inside the central office shall be made as close as practicable to the point where the outside plant cables enter the building. Except in cable vault locations, outside plant cables within the central office shall be wrapped with fireproof tape or enclosed in noncombustible conduit.
        (g) Bonding and grounding fiber optic cable, copper cable, and copper service wire -- (1) Bonding. Bonding is electrically connecting two or more metallic items of telephone hardware to maintain a common electrical potential. Bonding may involve connections to another utility.
        (2) Copper cable shield bond connections. (i) Cable shields shall be bonded at each splice location. Only RUS accepted cable shield bond connectors shall be used to provide bonding and grounding connections to metallic cable shields. The shield bond connector manufacturer's instructions shall be followed concerning installation and use.
        (ii)(A) Shield bonding conductors shall be either stranded or braided tinned copper wire equivalent to a minimum No. 6 American Wire Gauge (AWG) and shall be RUS accepted. The conductor connections shall be tinned or of a compatible bimetallic design to avoid corrosion problems associated with dissimilar metals. The number of shield bond connectors required per pair size
(TABLE START)and gauge shall be as shown in Table 8:
Table 8. -- Shield Bond Connectors per Pair Size and Gauge
@h119 AWG
@h1Pair size and gauge @h222 AWG @h224 AWG @h226 AWG
@h1No. of shield bond connectors
0 - 25  .... 0 - 100  .... 0 - 150  .... 0 - 200  .... 1
50 - 100  .... 150 - 300  .... 200 - 400  .... 300 - 600  .... 2
150 - 200  .... 400 - 600  .... 600 - 900  .... 900 - 1500  .... 3
300 - 600  .... 900 - 1200  .... 1200 - 2100  .... 1800 - 3600  .... 4
(TABLE END)
        (B) It is permissible to strap across the shield bond connectors of several cables with a single length of braided wire. However, both ends of the braid shall be terminated on the pedestal ground bracket to provide a bonding loop. Shield bond connection methods for individual cables are shown in Figures 13 through 15, and the bonding of several cables inside a pedestal using the bonding loop is shown in Figure 16:
E:\GRAPHICS\ER26JA95.014
E:\GRAPHICS\ER26JA95.015
E:\GRAPHICS\ER26JA95.016
E:\GRAPHICS\ER26JA95.017
        (3) Buried service wire shield bond connections. Buried service wire shields shall be connected to the pedestal bonding and grounding system. Typical buried service wire installations are shown in Figures 17 and 18. In addition to the methods referenced in Figures 17 and 18, the shields of buried service wires may also be connected to the pedestal bonding and grounding system using buried service wire bonding harnesses listed on Page 3.3.1, Item ``gs-b,'' of RUS Bulletin 1755I - 100. RUS Bulletin 1755I - 100 may be purchased from the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402. When those harnesses are used they shall be installed in accordance with the manufacturer's instructions. Figures 17 and 18 are as follows:
E:\GRAPHICS\ER26JA95.018
E:\GRAPHICS\ER26JA95.019
        (4) Fiber optic cable bond connections. (i) The cable shield and metallic strength members shall be bonded at each splice location. Only RUS accepted fiber optic cable shield bond connectors shall be used to provide bonding connections to the metallic cable shields. The shield bond connector manufacturer's instructions shall be followed concerning installation and use.
        (ii) Shield bonding conductors shall be either stranded or braided tinned copper wire equivalent to a minimum No. 6 American Wire Gauge (AWG) and shall be RUS accepted. The conductor connections shall be tinned or of a compatible bimetallic design to avoid corrosion problems associated with dissimilar metals.
        (5) Grounding. (i) Grounding is electrically connecting metallic telephone hardware to a National Electrical Safety Code (NESC) acceptable grounding electrode. Acceptable grounding electrodes are defined in the Rule 99A of the NESC.
        (ii) The conductor used for grounding metallic telephone hardware shall be a minimum No. 6 AWG solid, bare, copper conductor.
        (iii) For copper and fiber optic cable plant, all cable shields, all metallic strength members, and all metallic hardware shall be:
        (A) Grounded at each splice location to a driven grounding electrode (ground rod) of:
        (1) At least 1.5 meters (5 feet) in length where the local frost level is normally less than 0.30 meters (1 foot) deep; or
        (2) At least 2.44 meters (8 feet) in length where the local frost level is normally 0.30 meters (1 foot) or deeper; and
        (B) Bonded to a multi-grounded power system neutral when the splice is within 1.8 meters (6 feet) of access to the grounding system of the multi-grounded neutral system. Bonding to the multi-grounded neutral of a parallel power line may help to minimize telephone interference on long exposures with copper cable plant. Consideration, thus, should be given to completing such bonds, at least four (4) times each mile, when splices are greater than 1.8 meters (6 feet) but less than 4.6 meters (15 feet) from access to the multi-grounded neutral.
        (6) Bonding and grounding splice cases. (i) Splice cases are equipped with bonding and grounding devices to ensure that cable shields and metallic strength members maintain electrical continuity during and after cable splicing operations. The splice case manufacturer's recommendations shall be followed concerning the bonding and grounding procedures. Conductors used for bonding shall be either stranded or braided tinned copper wire equivalent to 6 AWG. Conductors used for grounding shall be a solid, bare, copper wire equivalent to minimum No. 6 AWG.
        (ii) Buried splice cases installed in either handholes or pedestals shall be grounded such that the cable shield grounds are attached to a common ground connection that will allow the lifting of a ground on the cable shield in either direction to permit efficient cable locating procedures. As a first choice, buried grounding conductor(s) shall be bare. However, if two or more grounding conductors are buried in the same trench, they shall be insulated to avoid shorts when a locating tone is applied.
        (iii) A typical bonding and grounding method for fiber optic splices is shown in Figure 19:
E:\GRAPHICS\ER26JA95.020
        (7) Bonding and grounding central office cable entrances. The RUS Telecommunications Engineering and Construction Manual (TE&CM) Section 810 provides bonding and grounding guidance for central office cable entrances. Splicing operations shall not be attempted before all metallic cable shield and strength members are bonded and grounded.
[60 FR 5097, Jan. 26, 1995; 60 FR 9079, Feb. 16, 1995]
__1755.201 -- 1755.369 [Reserved]
_1755.370   RUS specification for seven wire galvanized steel strand.
        (a) RUS incorporates by reference ASTM A475 - 78, Standard Specification for Zinc-Coated Steel Wire Strand, issued May 1978. All seven wire galvanized steel strand purchased after April 1, 1990, for use on telecommunications systems financed by RUS loan funds must conform to this standard. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51 on January 19, 1990). Copies of ASTM A475 - 78 are available for inspection during normal business hours at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC, and at the Rural Utilities Service, Administrative Services Division, room 0175 - S, U.S. Department of Agriculture, Washington, DC 20250, telephone 202 - 382 - 9551. Copies are available from the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103, telephone 215 - 299 - 5400.
        (b) In addition to the requirements of ASTM 475 - 78, all coils and reels having Class B or C coatings shall be marked with a 3-inch wide and 6-inch long deep-colored stripe, green or orange, respectively, to identify the class of galvanized coating of the strand. This marking shall be applied to the exposed convolutions of the strand in the eye of the coils and located near the midpoint on the outside layer of strand on the reels. The marking shall not cover any welded joint markings.
[55 FR 1792, Jan. 19, 1990; 55 FR 3685, Feb. 2, 1990. Redesignated at 55 FR 39397, Sept. 27, 1990]
__1755.371 -- 1755.389 [Reserved]
_1755.390   RUS specification for filled telephone cables.
        (a) Scope. (1) This section covers the requirements for filled telephone cables intended for direct burial installation either by trenching or by direct plowing, for underground application by placement in a duct, or for aerial installations by attachment to a support strand.
        (i) The conductors are solid copper, individually insulated with an extruded solid insulating compound.
        (ii) The insulated conductors are twisted into pairs which are then stranded or oscillated to form a cylindrical core.
        (iii) For high frequency applications, the cable core may be separated into compartments with screening shields.
        (iv) A moisture resistant filling compound is applied to the stranded conductors completely covering the insulated conductors and filling the interstices between pairs and units.
        (v) The cable structure is completed by the application of suitable core wrapping material, a flooding compound, a shield or a shield/armor, and an overall plastic jacket.
        (2) The number of pairs and gauge size of conductors which are
(TABLE START)used within the RUS program are provided in the following table:
@h1
@h1
@h1
@h1
@h1
        AWG  .... 19  .... 22  .... 24  .... 26
        Pairs  .... 6  .... 6  .... 6  ....
           .... 12  .... 12  .... 12  ....
           .... 18  .... 18  .... 18  ....
           .... 25  .... 25  .... 25  .... 25
           ....    .... 50  .... 50  .... 50
           ....    .... 75  .... 75  .... 75
           ....    .... 100  .... 100  .... 100
           ....    .... 150  .... 150  .... 150
           ....    .... 200  .... 200  .... 200
           ....    .... 300  .... 300  .... 300
           ....    .... 400  .... 400  .... 400
           ....    ....    .... 600  .... 600
           ....    ....    ....    .... 900
Footnote: Note: Cables larger in pair sizes than those shown in this table must meet all requirements of this section.
(TABLE END)
        (3) Screened cable, when specified, must meet all requirements of this section. The pair sizes of screened cables used within the RUS program are referenced in paragraph (e)(2)(i) of this section.
        (4) All cables sold to RUS borrowers for projects involving RUS loan funds under this section must be accepted by RUS Technical Standards Committee ``A'' (Telephone). For cables manufactured to the specification of this section, all design changes to an accepted design must be submitted for acceptance. RUS will be the sole authority on what constitutes a design change.
        (5) Materials, manufacturing techniques, or cable designs not specifically addressed by this section may be allowed if accepted by RUS. Justification for acceptance of modified materials, manufacturing techniques, or cable designs must be provided to substantiate product utility and long-term stability and endurance.
        (6) The American National Standard Institute/Insulated Cable Engineers Association, Inc. (ANSI/ICEA) S-84 - 608 - 1988 Standard For Telecommunications Cable, Filled, Polyolefin Insulated, Copper Conductor Technical Requirements referenced throughout this section is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of ANSI/ICEA S-84 - 608 - 1988 are available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from ICEA, P. O. Box 440, South Yarmouth, MA 02664, telephone number (508) 394 - 4424.
        (7) American Society for Testing and Materials specifications (ASTM) A 505-87, Standard Specification for Steel, Sheet and Strip, Alloy, Hot-Rolled and Cold-Rolled, General Requirements For; ASTM B 193-87, Standard Test Method for Resistivity of Electrical Conductor Materials; ASTM B 224-80, Standard Classification of Coppers; ASTM B 694-86, Standard Specification for Copper, Copper Alloy, and Copper-Clad Stainless Steel Sheet and Strip for Electrical Cable Shielding; ASTM D 4565-90a, Standard Test Methods for Physical and Environmental Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable; and ASTM D 4566-90, Standard Test Methods for Electrical Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable referenced in this section are incorporated by reference by RUS. These incorporations by references were approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of the ASTM standards are available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from ASTM, 1916 Race Street, Philadelphia, PA 19103 - 1187, telephone number (215) 299 - 5585.
        (b) Conductors and conductor insulation. (1) The gauge sizes of the copper conductors covered by this specification must be 19, 22, 24, and 26 American Wire Gauge (AWG).
        (2) Each conductor must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 2.1.
        (3) Factory joints made in conductors during the manufacturing process must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 2.2.
        (4) The raw materials used for conductor insulation must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 3.1 through 3.1.3.
        (5) The finished conductor insulation must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 3.2.1 and 3.3.
        (6) Insulated conductors must not have an overall diameter greater than 2 millimeters (mm) (0.081 inch (in.)).
        (7) A permissible overall performance level of faults in conductor insulation must average not greater than one fault per 12,000 conductor meters (40,000 conductor feet) for each gauge of conductor.
        (i) All insulated conductors must be continuously tested for insulation faults during the twinning operation with a method of testing acceptable to RUS. The length count and number of faults must be recorded. The information must be retained for a period of 6 months and be available for review by RUS when requested.
        (ii) The voltages for determining compliance with the requirements
(TABLE START)of this section are as follows:
@h1AWG
@h1Direct Current Voltages (kilovolts)
        19  .... 8.0
        22  .... 6.0
        24  .... 5.0
        26  .... 4.0
(TABLE END)
        (8) Repairs to the conductor insulation during manufacture are permissible. The method of repair must be accepted by RUS prior to its use. The repaired insulation must be capable of meeting the relevant electrical requirements of this section.
        (9) All repaired sections of insulation must be retested in the same manner as originally tested for compliance with paragraph (b)(7) of this section.
        (10) The colored insulating material removed from or tested on the conductor, from a finished cable, must meet the performance requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 3.4.1, 3.4.2, 3.4.4, 3.4.5, and 3.4.6.
        (c) Identification of pairs and twisting of pairs. (1) The insulation must be colored to identify:
        (i) The tip and ring conductor of each pair; and
        (ii) Each pair in the completed cable.
        (2) The colors to be used in the pairs in the 25 pair group, together with the pair numbers must be in accordance with the table specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 3.5.
        (3) Positive identification of the tip and ring conductors of each pair by marking each conductor of a pair with the color of its mate is permissible. The method of marking must be accepted by RUS prior to its use.
        (4) Other methods of providing positive identification of the tip and ring conductors of each pair may be employed if accepted by RUS prior to its use.
        (5) The insulated conductors must be twisted into pairs.
        (6) In order to provide sufficiently high crosstalk isolation, the pair twists must be designed to enable the cable to meet the capacitance unbalance and crosstalk loss requirements of paragraphs (k)(5), (k)(6), and (k)(8) of this section.
        (7) The average length of pair twists in any pair in the finished cable, when measured on any 3 meter (10 foot) length, must not exceed the requirement specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 3.5.
        (d) Forming of the cable core. (1) Twisted pairs must be assembled in such a way as to form a substantially cylindrical group.
        (2) When desired for lay-up reasons, the basic group may be divided into two or more subgroups called units.
        (3) Each group, or unit in a particular group, must be enclosed in bindings of the colors indicated for its particular pair count. The pair count, indicated by the colors of insulation, must be consecutive as indicated in paragraph (d)(6) of this section through units in a group.
        (4) The filling compound must be applied to the cable core in such a way as to provide as near a completely filled core as is commercially practical.
        (5) Threads and tapes used as binders must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 4.2 and 4.2.1.
        (6) The colors of the bindings and their significance with respect
(TABLE START)to pair count must be as follows:
@h1Group No.
@h1Color of Bindings
@h1Group Pair Count
        1  .... White-Blue  .... 1 - 25
        2  .... White-Orange  .... 26 - 50
        3  .... White-Green  .... 51 - 75
        4  .... White-Brown  .... 76 - 100
        5  .... White-Slate  .... 101 - 125
        6  .... Red-Blue  .... 126 - 150
        7  .... Red-Orange  .... 151 - 175
        8  .... Red-Green  .... 176 - 200
        9  .... Red-Brown  .... 201 - 225
        10  .... Red-Slate  .... 226 - 250
        11  .... Black-Blue  .... 251 - 275
        12  .... Black-Orange  .... 276 - 300
        13  .... Black-Green  .... 301 - 325
        14  .... Black-Brown  .... 326 - 350
        15  .... Black-Slate  .... 351 - 375
        16  .... Yellow-Blue  .... 376 - 400
        17  .... Yellow-Orange  .... 401 - 425
        18  .... Yellow-Green  .... 426 - 450
        19  .... Yellow-Brown  .... 451 - 475
        20  .... Yellow-Slate  .... 476 - 500
        21  .... Violet-Blue  .... 501 - 525
        22  .... Violet-Orange  ....  526 - 550
        23  .... Violet-Green  .... 551 - 575
        24  .... Violet-Brown  .... 576 - 600
(TABLE END)
        (7) The use of the white unit binder in cables of 100 pairs or less is optional.
        (8) When desired for manufacturing reasons, two or more 25 pair groups may be bound together with nonhygroscopic and nonwicking threads or tapes into a super-unit. Threads or tapes must meet the requirements specified in paragraph (d)(5) of this section. The group binders and the super-unit binders must be color coded such that the combination of the two binders must positively identify each 25 pair group from every other 25 pair group in the
(TABLE START)cable. Super-unit binders must be of the color shown in the following table:
Super-Unit Binder Colors
@h1Pair Numbers
@h1Binder Color
        1 - 600  .... White
        601 - 1200  .... Red
        1201 - 1800  .... Black
        1801 - 2400  .... Yellow
        2401 - 3000  .... Violet
(TABLE END)
        (9) Color binders must not be missing for more than 90 meters (300 feet) from any 25 pair group or from any subgroup used as part of a super-unit. At any cable cross-section, no adjacent 25 pair groups and no more than one subgroup of any super-unit may have missing binders. In no case must the total number of missing binders exceed three. Missing super-unit binders must not be permitted for any distance.
        (10) Any reel of cable which contains missing binders must be labeled indicating the colors and location of the binders involved. The labeling must be applied to the reel and also to the cable.
        (e) Screened cable. (1) Screened cable must be constructed such that a metallic, internal screen(s) must be provided to separate and provide sufficient isolation between the compartments to meet the requirements of this section.
        (2) At the option of the user or manufacturer, identified service pairs providing for voice order and fault location may be placed in screened cables.
        (i) The number of service pairs provided must be one per twenty-five operating pairs plus two for a cable size up to and including 400 pairs, subject to a minimum of four service pairs. The pair counts for screened
(TABLE START)cables are as follows:
Screened Cable Pair Counts
@h1Carrier Pair Count
@h1Service Pairs
@h1Total Pair Count
        24  .... 4  .... 28
        50  .... 4  .... 54
        100  .... 6  .... 106
        150  .... 8  .... 158
        200  .... 10  .... 210
        300  .... 14  .... 314
        400  .... 18  .... 418
(TABLE END)
        (ii) The service pairs must be equally divided among the compartments. The color sequence must be repeated in each compartment.
        (iii) The electrical and physical characteristics of each service pair must meet all the requirements set forth in this section.
        (iv) The colors used for the service pairs must be in accordance with the requirements of paragraph (b)(5) of this section. The color code used for the service pairs together with the service pair number are shown in the
(TABLE START)following table:
Color Code For Service Pairs
@h1Service Pair No.
@h1Color@h2Tip@h2Ring
        1  .... White  .... Red
        2  ....  ''  .... Black
        3  ....  ''  .... Yellow
        4  ....  ''  .... Violet
        5  .... Red  .... Black
        6  ....  ''  .... Yellow
        7  ....  ''  .... Violet
        8  .... Black  .... Yellow
        9  ....  ''  .... Violet
(TABLE END)
        (3) The screen tape must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 5.1 through 5.4.
        (4) The screen tape must be tested for dielectric strength by completely removing the protective coating from one end to be used for grounding purposes.
        (i) Using an electrode, over a 30 centimeter (1 foot) length, apply a direct current voltage at the rate of rise of 500 volts/second until failure.
        (ii) No breakdown should occur below 8 kilovolts.
        (f) Filling compound. (1) After or during the stranding operation and prior to application of the core wrap, filling compound must be applied to the cable core. The compound must be as nearly colorless as is commercially feasible and consistent with the end product requirements and pair identification.
        (2) The filling compound must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 4.4 through 4.4.4.
        (3) The individual cable manufacturer must satisfy RUS that the filling compound selected for use is suitable for its intended application. The filling compound must be applied to the cable in such a manner that the cable components will not be degraded.
        (g) Core wrap. (1) The core wrap must comply with the requirements specified in ANSI/ICEA-S-84 - 608 - 1988, paragraph 4.3.
        (2) If required for manufacturing reasons, white or colored binders of nonhygroscopic and nonwicking material may be applied over the core and/or wrap. When used, binders must meet the requirements specified in paragraph (d)(5) of this section.
        (3) Sufficient filling compound must be applied to the core wrap so that voids or air spaces existing between the core and the inner side of the core wrap are minimized.
        (h) Flooding compound (1) Sufficient flooding compound must be applied on all sheath interfaces so that voids and air spaces in these areas are minimized. When the optional armored design is used, the flooding compound must be applied between the core wrap and shield, between the shield and armor, and between the armor and the jacket so that voids and air spaces in these areas are minimized. The use of floodant over the outer metallic substrate is not required if uniform bonding, per paragraph (i)(7) of this section, is achieved between the plastic-clad metal and the jacket.
        (2) The flooding compound must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 4.5 and the jacket slip test requirements of appendix A, paragraph (III)(5) of this section.
        (3) The individual cable manufacturer must satisfy RUS that the flooding compound selected for use is acceptable for the application.
        (i) Shield and optional armor (1) A single corrugated shield must be applied longitudinally over the core wrap.
        (2) For unarmored cable the shield overlap must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.2. Core diameter is defined as the diameter under the core wrap and binding.
        (3) For cables containing the coated aluminum shield/coated steel armor (CACSP) sheath design, the coated aluminum shield must be applied in accordance with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.2, Dual Tape Shielding System.
        (4) General requirements for application of the shielding material are as follows:
        (i) Successive lengths of shielding tapes may be joined during the manufacturing process by means of cold weld, electric weld, soldering with a nonacid flux, or other acceptable means.
        (ii) Shield splices must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.3.
        (iii) The corrugations and the application process of the coated aluminum and copper bearing shields must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.1.
        (iv) The shielding material must be applied in such a manner as to enable the cable to pass the cold bend test specified in paragraph (l)(3) of this section.
        (5) The following is a list of acceptable materials for use as cable shielding. Other types of shielding materials may also be used provided
(TABLE START)they are accepted by RUS prior to their use.
@h1Standard Cable
@h1Gopher Resistant Cable
        8-mil Coated Aluminum1  .... 10-mil Copper
        5-mil Copper  .... 6-mil Copper-CladStainless Steel5 mil Copper-CladStainless Steel5 mil Copper-Clad AlloySteel7-mil Alloy 1946-mil Alloy 1948-mil Coated Aluminum1and 6-mil Coated Steel1
Footnote: \1\Dimensions of uncoated metal
(TABLE END)
        (i) The 8-mil aluminum tape must be plastic coated on both sides and must comply with the requirements of ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.2.
        (ii) The 5-mil copper tape must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.3.
        (iii) The 10-mil copper tape must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.4.
        (iv) The 6-mil copper clad stainless steel tape must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.5.
        (v) The 5-mil copper clad stainless steel tape must be in the fully annealed condition and must conform to the requirements of American Society for Testing and Materials (ASTM) B 694 - 86, with a cladding ratio of 16/68/16.
        (A) The electrical conductivity of the clad tape must be a minimum of 28 percent of the International Annealed Copper Standard (IACS) when measured per ASTM B 193 - 87.
        (B) The tape must be nominally 0.13 millimeter (0.005 inch) thick with a minimum thickness of 0.11 millimeter (0.0045 inch).
        (vi) The 5-mil copper clad alloy steel tape must be in the fully annealed condition and the copper component must conform to the requirements of ASTM B 224 - 80 and the alloy steel component must conform to the requirements of ASTM A 505 - 87, with a cladding ratio of 16/68/16.
        (A) The electrical conductivity of the copper clad alloy steel tape must comply with the requirement specified in paragraph (i)(5)(v)(A) of this section.
        (B) The thickness of the copper clad alloy steel tape must comply with the requirements specified in paragraph (i)(5)(v)(B) of this section.
        (vii) The 6-mil and 7-mil 194 copper alloy tapes must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.6.
        (6) The corrugation extensibility of the coated aluminum shield must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.4.
        (7) When the jacket is bonded to the plastic coated aluminum shield, the bond between the jacket and shield must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 7.2.6.
        (8) A single plastic-coated steel corrugated armor must be applied longitudinally directly over the coated aluminum shield listed in paragraph (i)(5) of this section with an overlap complying with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.2, Outer Steel Tape.
        (9) Successive lengths of steel armoring tapes may be joined during the manufacturing process by means of cold weld, electric weld, soldering with a nonacid flux, or other acceptable means. Armor splices must comply with the breaking strength and resistance requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.3.
        (10) The corrugations and the application process of the coated steel armor must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.1.
        (i) The corrugations of the armor tape must coincide with the corrugations of the coated aluminum shield.
        (ii) Overlapped portions of the armor tape must be in register (corrugations must coincide at overlap) and in contact at the outer edge.
        (11) The armoring material must be so applied to enable the cable to pass the cold bend test as specified in paragraph (l)(3) of this section.
        (12) The 6-mil steel tape must be electrolytic chrome-coated steel (ECCS) plastic coated on both sides and must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.8.
        (13) When the jacket is bonded to the plastic-coated steel armor, the bond between the jacket and armor must comply with the requirement specified in ANSI/ICEA-S-84 - 608 - 1988, paragraph 7.2.6.
        (j) Cable jacket. (1) The jacket must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 7.2.
         (2) The raw materials used for the cable jacket must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 7.2.1.
        (3) Jacketing material removed from or tested on the cable must meet the performance requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 7.2.3 and 7.2.4.
        (4) The thickness of the jacket must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 7.2.2.
        (k) Electrical requirements -- (1) Conductor resistance. The direct current resistance of any conductor in a completed cable and the average resistance of all conductors in a Quality Control Lot must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.1.
        (2) Resistance unbalance. (i) The direct current resistance unbalance between the two conductors of any pair in a completed cable and the average resistance unbalance of all pairs in a completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.2.
        (ii) The resistance unbalance between tip and ring conductors shall be random with respect to the direction of unbalance. That is, the resistance of the tip conductors shall not be consistently higher with respect to the ring conductors and vice versa.
        (3) Mutual capacitance. The average mutual capacitance of all pairs in a completed cable and the individual mutual capacitance of any pair in a completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.3.
        (4) Capacitance difference. (i) The capacitance difference for completed cables having 75 pairs or greater must comply with the requirement specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.4.
        (ii) When measuring screened cable, the inner and outer pairs must be selected from both sides of the screen.
        (5) Pair-to-pair capacitance unbalance -- (i) Pair-to-pair. The capacitance unbalance as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.5.
        (ii) Screened cable. In cables with 25 pairs or less and within each group of multigroup cables, the pair-to-pair capacitance unbalance between any two pairs in an individual compartment must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.5. The pair-to-pair capacitance unbalances to be considered must be:
        (A) Between pairs adjacent in a layer in an individual compartment;
        (B) Between pairs in centers of 4 pairs or less in an individual compartment; and
        (C) Between pairs in adjacent layers in an individual compartment when the number of pairs in the inner (smaller) layer is 6 or less. The center is counted as a layer.
        (iii) In cables with 25 pairs or less, the root-mean-square (rms) value must include all the pair-to-pair unbalances measured for each compartment separately.
        (iv) In cables containing more than 25 pairs, the rms value must include the pair-to-pair unbalances in the separate compartments.
        (6) Pair-to-ground capacitance unbalance -- (i) Pair-to-ground. The capacitance unbalance as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.6.
        (ii) When measuring pair-to-ground capacitance unbalance all pairs except the pair under test are grounded to the shield and/or shield/armor except when measuring cables containing super units in which case all other pairs in the same super unit must be grounded to the shield.
        (iii) The screen tape must be left floating during the test.
        (iv) Pair-to-ground capacitance unbalance may vary directly with the length of the cable.
        (7) Attenuation. (i) For nonscreened and screened cables, the average attenuation of all pairs on any reel when measured at 150 and 772 kilohertz must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.7, Solid Column.
        (ii) For T1C type cables over 12 pairs, the maximum average attenuation of all pairs on any reel must not exceed the values listed below when measured at a frequency of 1576 kilohertz at or corrected to a temperature of 20 1B 1C. The test must be conducted in
(TABLE START)accordance with ASTM D 4566 - 90.
@h1AWG
@h1Maximum Average Attenuation decibel/kilometer (dB/km) (decibel/mile)
19  .... 13.4 (21.5)
22  .... 18.3 (29.4)
24  .... 23.1 (37.2)
(TABLE END)
        (8) Crosstalk loss. (i) The equal level far-end power sum crosstalk loss (FEXT) as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.8, FEXT Table.
        (ii) The near-end power sum crosstalk loss (NEXT) as measured on completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.8, NEXT Table.
        (iii) Screened cable. (A) For screened cables the NEXT as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 8.9 and 8.9.1.
        (B) For T1C screened cable the NEXT as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 8.9 and 8.9.2.
        (9) Insulation resistance. The insulation resistance of each insulated conductor in a completed cable must comply with the requirement specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.11.
        (10) High voltage test. (i) In each length of completed cable, the insulation between conductors must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.12, Solid Column.
        (ii) In each length of completed cable, the dielectric between the shield and/or armor and conductors in the core must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.13, Single Jacketed, Solid Column. In screened cable the screen tape must be left floating.
        (iii) Screened cable. (A) In each length of completed screened cable, the dielectric between the screen tape and the conductors in the core must comply with the requirement specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.14.
        (B) In this test, the cable shield and/or armor must be left floating.I11(11) Electrical variations. (i) Pairs in each length of cable having either a ground, cross, short, or open circuit condition will not be permitted.
        (ii) The maximum number of pairs in a cable which may vary as specified in paragraph (k)(11)(iii) of this section from the electrical parameters given in this section are listed below. These pairs may be excluded
(TABLE START)from the arithmetic calculation.
@h1Nominal Pair Count
@h1Maximum Number of Pairs With Allowable Electrical Variation
6 - 100  .... 1
101 - 300  .... 2
301 - 400  .... 3
401 - 600  .... 4
601 and above  .... 6
(TABLE END)
        (iii) Parameter variations. (A) Capacitance unbalance-to-ground. If the cable fails either the maximum individual pair or average capacitance unbalance-to-ground requirement and all individual pairs are 3937 picofarad/kilometer (1200 picofarad/1000 feet) or less, the number of pairs specified in paragraph (k)(11)(ii) of this section may be eliminated from the average and maximum individual calculations.
        (B) Resistance unbalance. Individual pair of 7 percent for all gauges.
        (C) Conductor resistance, maximum. The following table shows
(TABLE START)maximum conductor resistance:
@h1AWG
@h1ohms/kilometer
@h1(ohms/1000 feet)
        19  .... 29.9  .... ( 9.1)
        22  .... 60.0  .... (18.3)
        24  .... 94.5  .... (28.8)
        26  .... 151.6  .... (46.2)
Footnote: Note: RUS recognizes that in large pair count cable (600 pair and above) a cross, short or open circuit condition occasionally may develop in a pair which does not affect the performance of the other cable pairs. In these circumstances rejection of the entire cable may be economically unsound or repairs may be impractical. In such circumstances the manufacturer may desire to negotiate with the customer for acceptance of the cable. No more than 0.5 percent of the pairs may be involved.
(TABLE END)
        (l) Mechanical requirements -- (1) Compound flow test. All cables manufactured in accordance with the requirements of this section must be capable of meeting the compound flow test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.1 using a test temperature of 80 1B 1C.
        (2) Water penetration. All cables manufactured in accordance with the requirements of this section must be capable of meeting the water penetration test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.2.
        (3) Cable cold bend test. All cables manufactured in accordance with the requirements of this section must be capable of meeting the cable cold bend test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.3.
        (4) Cable impact test. All cables manufactured in accordance with the requirements of this section must be capable of meeting the cable impact test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.4.
        (5) Jacket notch test (CACSP sheath only). All cables utilizing the coated aluminum/coated steel sheath (CACSP) design manufactured in accordance with the requirements of this section must be capable of meeting the jacket notch test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.5.
        (6) Cable torsion test (CACSP sheath only). All cables utilizing the coated aluminum/coated steel sheath (CACSP) design manufactured in accordance with the requirements of this section must be capable of meeting the cable torsion test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.6.
        (m) Sheath slitting cord (optional). (1) Sheath slitting cords may be used in the cable structure at the option of the manufacturer unless specified by the end user.
        (2) When a sheath slitting cord is used it must be nonhygroscopic and nonwicking, continuous throughout a length of cable and of sufficient strength to open the sheath without breaking the cord.
        (n) Identification marker and length marker. (1) Each length of cable must be identified in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraphs 10.1 through 10.1.4. The color of the ink used for the initial outer jacket marking must be either white or silver.
        (2) The markings must be printed on the jacket at regular intervals of not more than 0.6 meter (2 feet).
        (3) The completed cable must have sequentially numbered length markers in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 10.1.5. The color of the ink used for the initial outer jacket marking must be either white or silver.
        (o) Preconnectorized cable (optional). (1) At the option of the manufacturer and upon request by the purchaser, cables 100 pairs and larger may be factory terminated in 25 pair splicing modules.
        (2) The splicing modules must meet the requirements of RUS Bulletin 345 - 54, PE-52, RUS Specification for Telephone Cable Splicing Connectors (Incorporated by reference at _1755.97), and be accepted by RUS prior to their use.
        (p) Acceptance testing and extent of testing. (1) The tests described in appendix A of this section are intended for acceptance of cable designs and major modifications of accepted designs. What constitutes a major modification is at the discretion of RUS. These tests are intended to show the inherent capability of the manufacturer to produce cable products having long life and stability.
        (2) For initial acceptance, the manufacturer must submit:
        (i) An original signature certification that the product fully complies with each section of the specification;
        (ii) Qualification Test Data, per appendix A of this section;
        (iii) To periodic plant inspections;
        (iv) A certification that the product does or does not comply with the domestic origin manufacturing provisions of the ``Buy American'' requirements of the Rural Electrification Act of 1938 (7 U.S.C. 901 et seq.);
        (v) Written user testimonials concerning field performance of the product; and
        (vi) Other nonproprietary data deemed necessary by the Chief, Outside Plant Branch (Telephone).
        (3) For requalification acceptance, the manufacturer must submit an original signature certification that the product fully complies with each section of the specification, excluding the Qualification Section, and a certification that the product does or does not comply with the domestic origin manufacturing provisions of the ``Buy American'' requirements of the Rural Electrification Act of 1938 (7 U.S.C. 901 et seq.), for acceptance by August 30 of each year. The required data must have been gathered within 90 days of the submission. If the initial acceptance of a product to this specification was within 180 days of August 30, then requalification for that product will not be required for that year.
        (4) Initial and requalification acceptance requests should be addressed to:
        Chairman, Technical Standards Committee ``A'' (Telephone), Telecommunications Standards Division, Rural Utilities Service, Washington, DC 20250 - 1500.
        (5) Tests on 100 percent of completed cable. (i) The shield and/or armor of each length of cable must be tested for continuity in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 8.16.
        (ii) The screen tape of each length of screened cable must be tested for continuity in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 8.16.
        (iii) Dielectric strength between conductors and shield and/or armor must be tested to determine freedom from grounds in accordance with paragraph (k)(10)(ii) of this section.
        (iv) Dielectric strength between conductors and screen tape must be tested to determine freedom from grounds in accordance with paragraph (k)(10)(iii) of this section.
        (v) Each conductor in the completed cable must be tested for continuity in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 8.16.
        (vi) Dielectric strength between conductors must be tested to insure freedom from shorts and crosses in each length of completed cable in accordance with paragraph (k)(10)(i) of this section.
        (vii) Each conductor in the completed preconnectorized cable must be tested for continuity.
        (viii) Each length of completed preconnectorized cable must be tested for split pairs.
        (ix) The average mutual capacitance must be measured on all cables. If the average mutual capacitance for the first 100 pairs tested from randomly selected groups is between 50 and 53 nanofarad/kilometer (nF/km) (80 and 85 nanofarad/mile), the remainder of the pairs need not be tested on the 100 percent basis (See paragraph (k)(3) of this section).
        (6) Capability tests. Tests on a quality assurance basis must be made as frequently as is required for each manufacturer to determine and maintain compliance with:
        (i) Performance requirements for conductor insulation, jacketing material, and filling and flooding compounds;
        (ii) Bonding properties of coated or laminated shielding and armoring materials and performance requirements for screen tape;
        (iii) Sequential marking and lettering;
        (iv) Capacitance difference, capacitance unbalance, crosstalk, and attenuation;
        (v) Insulation resistance, conductor resistance and resistance unbalance;
        (vi) Cable cold bend and cable impact tests;
        (vii) Water penetration and compound flow tests; and
        (viii) Jacket notch and cable torsion tests.
        (q) Summary of records of electrical and physical tests. (1) Each manufacturer must maintain suitable summary records for a period of at least 3 years of all electrical and physical tests required on completed cable by this section as set forth in paragraphs (p)(5) and (p)(6) of this section. The test data for a particular reel must be in a form that it may be readily available to the purchaser or to RUS upon request.
        (2) Measurements and computed values must be rounded off to the number of places or figures specified for the requirement according to ANSI/ICEA S-84 - 608 - 1988, paragraph 1.3.
        (r) Manufacturing irregularities. (1) Repairs to the shield and/or armor are not permitted in cable supplied to end users under this section.
        (2) Minor defects in jackets (defects having a dimension of 3 millimeters (0.125 inch) or less in any direction) may be repaired by means of heat fusing in accordance with good commercial practices utilizing sheath grade compounds.
        (s) Preparation for shipment. (1) The cable must be shipped on reels. The diameter of the drum must be large enough to prevent damage to the cable from reeling or unreeling. The reels must be substantial and so constructed as to prevent damage to the cable during shipment and handling.
        (2) The thermal wrap must comply with the requirements of ANSI/ICEA S-84 - 608 - 1988, paragraph 10.3. When a thermal reel wrap is supplied, the wrap must be applied to the reel and must be suitably secured in place to minimize thermal exposure to the cable during storage and shipment. The use of the thermal reel wrap as a means of reel protection will be at the option of the manufacturer unless specified by the end user.
        (3) The outer end of the cable must be securely fastened to the reel head so as to prevent the cable from becoming loose in transit. The inner end of the cable must be securely fastened in such a way as to make it readily available if required for electrical testing. Spikes, staples, or other fastening devices which penetrate the cable jacket must not be used. The method of fastening the cable ends must be accepted by RUS prior to its use.
        (4) Each length of cable must be wound on a separate reel unless otherwise specified or agreed to by the purchaser.
        (5) The arbor hole must admit a spindle 63 millimeters (2.5 inches) in diameter without binding. Steel arbor hole liners may be used but must be accepted by RUS prior to their use.
        (6) Each reel must be plainly marked to indicate the direction in which it should be rolled to prevent loosening of the cable on the reel.
        (7) Each reel must be stenciled or labeled on either one or both sides with the information specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 10.4 and the RUS cable designation:
Cable Designation
BFC
Cable Construction
Pair Count
Conductor Gauge
A = Coated Aluminum Shield
C = Copper Shield
Y = Gopher Resistant Shield
X = Armored, Separate Shield
H = T1 Screened Cable
H1C = T1C Screened Cable
P = Preconnectorized
  Example: BFCXH100 - 22
Buried Filled Cable, Armored (w/separate shield), T1 Screened Cable, 100 pair, 22 AWG.
        (8) When cable manufactured to the requirements of this section is shipped, both ends must be equipped with end caps acceptable to RUS.
        (9) When preconnectorized cables are shipped, the splicing modules must be protected to prevent damage during shipment and handling. The protection method must be acceptable to RUS and accepted prior to its use.
        (10) All cables ordered for use in underground duct applications must be equipped with a factory-installed pulling-eye on the outer end in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 10.5.2.
(The information and recordkeeping requirements of this section have been approved by the Office of Management and Budget (OMB) under the control number 0572 - 0059)
Appendix A to 7 CFR 1755.390 -- Qualification Test Methods
        (I) The test procedures described in this appendix are for qualification of initial designs and major modification of accepted designs. Included in (V) of this appendix are suggested formats that may be used in submitting the test results to RUS.
        (II) Sample selection and preparation. (1) All testing must be performed on lengths removed sequentially from the same 25 pair, 22 gauge jacketed cable. This cable must not have been exposed to temperatures in excess of 38C since its initial cool down after sheathing. The lengths specified are minimum lengths and if desirable from a laboratory testing standpoint longer lengths may be used.
        (a) Length A shall be 10 1B 0.2 meters (33 1B 0.5 feet) long and must be maintained at 23 1B 3C. One length is required.
        (b) Length B shall be 12 1B 0.2 meters (40 1B 0.5 feet) long. Prepare the test sample by removing the jacket, shield or shield/armor and core wrap for a sufficient distance on both ends to allow the insulated conductors to be flared out. Remove sufficient conductor insulation so that appropriate electrical test connections can be made at both ends. Coil the sample with a diameter of 15 to 20 times its sheath diameter. Three lengths are required.
        (c) Length C shall be one meter (3 feet) long. Four lengths are required.
        (d) Length D shall be 300 millimeters (1 foot) long. Four lengths are required.
        (e) Length E must be 600 millimeters (2 feet) long. Four lengths are required.
        (f) Length F shall be 3 meters (10 feet) long and must be maintained at 23 1B 3C for the duration of the test. Two lengths are required.
        (2) Data reference temperature. Unless otherwise specified, all measurements must be made at 23 1B 3C.
        (III) Environmental tests -- (1) Heat aging test -- (a) Test samples. Place one sample each of lengths B, C, D and E in an oven or environmental chamber. The ends of Sample B must exit from the chamber or oven for electrical tests. Securely seal the oven exit holes.
        (b) Sequence of tests. The samples are to be subjected to the following tests after conditioning:
        (i) Water Immersion Test outlined in (III)(2) of this appendix;
        (ii) Water Penetration Test outlined in (III)(3) of this appendix;
        (iii) Insulation Compression Test outlined in (III)(4) of this appendix; and
        (iv) Jacket Slip Strength Test outlined in (III)(5) of this appendix.
        (c) Initial measurements. (i) For Sample B measure the open circuit capacitance for each odd numbered pair at 1, 150, and 772 kilohertz, and the attenuation at 150 and 772 kilohertz after conditioning the sample at the data reference temperature for 24 hours. Calculate the average and standard deviation for the data of the 13 pairs on a per kilometer or (on a per mile) basis.
        (ii) The attenuation at 150 and 772 kilohertz may be calculated from open circuit admittance (Yoc) and short circuit impedance (Zsc) or may be obtained by direct measurement of attenuation.
        (iii) Record on suggested formats in (V) of this appendix or on other easily readable formats.
        (d) Heat conditioning. (i) Immediately after completing the initial measurements, condition the sample for 14 days at a temperature of 65 1B 2C.
        (ii) At the end of this period note any exudation of cable filler. Measure and calculate the parameters given in (III)(1)(c) of this appendix. Record on suggested formats in (V) of this appendix or on other easily readable formats.
        (iii) Cut away and discard a one meter (3 foot) section from each end of length B.
        (e) Overall electrical deviation. (i) Calculate the percent change in all average parameters between the final parameters after conditioning and the initial parameters in (III)(1)(c) of this appendix.
        (ii) The stability of the electrical parameters after completion of this test must be within the following prescribed limits:
        (A) Capacitance. The average mutual capacitance must be within 5 percent of its original value;
        (B) The change in average mutual capacitance must be less than 5 percent over frequency 1 to 150 kilohertz; and
        (C) Attenuation. The 150 and 772 kilohertz attenuation must not have increased by more than 5 percent over their original values.
        (2) Water immersion electrical test -- (a) Test sample selection. The 10 meter (33 foot) section of length B must be tested.
        (b) Test sample preparation. Prepare the sample by removing the jacket, shield or shield/armor, and core wrap for sufficient distance to allow one end to be accessed for test connections. Cut out a series of 6 millimeter (0.25 inch) diameter holes along the test sample, at 30 centimeters (1 foot) intervals progressing successively 90 degrees around the circumference of the cable. Assure that the cable core is exposed at each hole by slitting the core wrapper. Place the prepared sample in a dry vessel which when filled will maintain a one meter (3 foot) head of water over 6 meters (20 feet) of uncoiled cable. Extend and fasten the ends of the cable so they will be above the water line and the pairs are rigidly held for the duration of the test.
        (c) Capacitance testing. Measure the initial values of mutual capacitance of all odd pairs in each cable at a frequency of 1 kilohertz before filling the vessel with water. Be sure the cable shield or shield/armor is grounded to the test equipment. Fill the vessels until there is a one meter (3 foot) head of water on the cables.
        (i) Remeasure the mutual capacitance after the cables have been submerged for 24 hours and again after 30 days.
        (ii) Record each sample separately on suggested formats in (V) of this appendix or on other easily readable formats.
        (d) Overall electrical deviation. (i) Calculate the percent change in all average parameters between the final parameters after conditioning with the initial parameters in (III)(2)(c) of this appendix.
        (ii) The average mutual capacitance must be within 5 percent of its original value.
        (3) Water penetration testing. (a) A watertight closure must be placed over the jacket of length C. The closure must not be placed over the jacket so tightly that the flow of water through pre-existing voids of air spaces is restricted. The other end of the sample must remain open.
        (b) Test per Option A or Option B -- (i) Option A. Weigh the sample and closure prior to testing. Fill the closure with water and place under a continuous pressure of 10 1B 0.7 kilopascals (1.5 1B 0.1 pounds per square inch gauge) for one hour. Collect the water leakage from the end of the test sample during the test and weigh to the nearest 0.1 gram. Immediately after the one hour test, seal the ends of the cable with a thin layer of grease and remove all visible water from the closure, being careful not to remove water that penetrated into the core during the test. Reweigh the sample and determine the weight of water that penetrated into the core. The weight of water that penetrated into the core must not exceed 8 grams.
        (ii) Option B. Fill the closure with a 0.2 gram sodium fluorscein per liter water solution and apply a continuous pressure 10 1B 0.7 kilopascals (1.5 1B 0.1 pounds per square inch gauge) for one hour. Catch and weigh any water that leaks from the end of the cable during the one hour period. If no water leaks from the sample, carefully remove the water from the closure. Then carefully remove the jacket, shield or shield/armor and core wrap one at a time, examining with an ultraviolet light source for water penetration. After removal of the core wrap, carefully dissect the core and examine for water penetration within the core. Where water penetration is observed, measure the penetration distance. The distance of water penetration into the core must not exceed 127 millimeters (5.0 inches).
        (4) Insulation compression test -- (a) Test Sample D. Remove jacket, shield or shield/armor, and core wrap being careful not to damage the conductor insulation. Remove one pair from the core and carefully separate, wipe off core filler, and straighten the insulated conductors. Retwist the two insulated conductors together under sufficient tension to form 10 evenly spaced 360 degree twists in a length of 10 centimeters (4 inches).
        (b) Sample testing. Center the mid 50 millimeters (2 inches) of the twisted pair between 2 smooth rigid parallel metal plates that are 50 millimeters 0A 50 millimeters (2 inches 0A 2 inches). Apply a 1.5 volt direct current potential between the conductors, using a light or buzzer to indicate electrical contact between the conductors. Apply a constant load of 67 newtons (l5 pound-force) on the sample for one minute and monitor for evidence of contact between the conductors. Record results on suggested formats in (V) of this appendix or on other easily readable formats.
        (5) Jacket slip strength test -- (a) Sample selection. Test Sample E from (III)(1)(a) of this appendix.
        (b) Sample preparation. Prepare test sample in accordance with the procedures specified in ASTM D 4565 - 90a.
        (c) Sample conditioning and testing. Remove the sample from the tensile tester prior to testing and condition for one hour at 50 1B 2C. Test immediately in accordance with the procedures specified in ASTM D 4565 - 90a. A minimum jacket slip strength of 67 newtons (15 pound-force) is required. Record the highest load attained.
        (6) Humidity exposure. (a) Repeat steps (III)(1)(a) through (III)(1)(c)(iii) of this appendix for separate set of samples B, C, D, and E which have not been subjected to prior environmental conditioning.
        (b) Immediately after completing the measurements, expose the test sample to 100 temperature cyclings. Relative humidity within the chamber must be maintained at 90 1B 2 percent. One cycle consists of beginning at a stabilized chamber and test sample temperature of 52 1B 1C, increasing the temperature to 57 1B 1C, allowing the chamber and test samples to stabilize at this level, then dropping the temperature back to 52 1B 1C.
        (c) Repeat steps (III)(1)(d)(ii) through (III)(5)(c) of this appendix.
        (7) Temperature cycling. (a) Repeat steps (III)(1)(a) through (III)(1)(c)(iii) of this appendix for separate set of samples B, C, D, and E which have not been subjected to prior environmental conditioning.
        (b) Immediately after completing the measurements, subject the test sample to the 10 cycles of temperature between a minimum of 40C and +60C. The test sample must be held at each temperature extreme for a minimum of 1 1/2 hours during each cycle of temperature. The air within the temperature cycling chamber must be circulated throughout the duration of the cycling.
        (c) Repeat steps (III)(1)(d)(ii) through (III)(5)(c) of this appendix.
        (IV) Control sample -- (1) Test samples. A separate set of lengths A, C, D, E, and F must have been maintained at 23 1B 3C for at least 48 hours before the testing.
        (2) Repeat steps (III)(2) through (III)(5)(c) of this appendix except use length A instead of length B.
        (3) Surge Test. (a) One length of sample F must be used to measure the breakdown between conductors while the other length of F must be used to measure the core to shield breakdown.
        (b) The samples must be capable of withstanding without damage, a single surge voltage of 20 kilovolts peak between conductors, and a 35 kilovolts peak surge voltage between conductors and the shield or shield/armor as hereinafter described. The surge voltage must be developed from a capacitor discharged through a forming resistor connected in parallel with the dielectric of the test sample. The surge generator constants must be such as to produce a surge of 1.5 0A 40 microsecond wave shape.
        (c) The shape of the generated wave must be determined at a reduced voltage by connecting an oscilloscope across the forming resistor with the cable sample connected in parallel with the forming resistor. The capacitor bank is charged to the test voltage and then discharged through the forming resistor and test sample. The test sample will be considered to have passed the test if there is no distinct change in the wave shape obtained with the initial reduced voltage compared to that obtained after the application of the test voltage.
        (V) The following suggested formats may be used in submitting the
(TABLE START)test results to RUS:
Environmental ConditioningXXXXXXX
Frequency 1 kilohertz
@h1Pair Number
@h1Capacitance@h2nF/km (nanofarad/mile)@h3Initial@h3Final
        1 .... XXXXXX .... XXXXXX
        3 .... XXXXXX .... XXXXXX
        5 .... XXXXXX .... XXXXXX
        7 .... XXXXXX .... XXXXXX
        9 .... XXXXXX .... XXXXXX
        11 .... XXXXXX .... XXXXXX
        13 .... XXXXXX .... XXXXXX
        15 .... XXXXXX .... XXXXXX
        17 .... XXXXXX .... XXXXXX
        19 .... XXXXXX .... XXXXXX
        21 .... XXXXXX .... XXXXXX
        23 .... XXXXXX .... XXXXXX
        25 .... XXXXXX .... XXXXXX
        Average xAE8 .... XXXXXX .... XXXXXX
Footnote: Overall Percent
(TABLE START)Difference in Average xAE8 XXXXXXX
(TABLE END)
Environmental ConditioningXXXXXXX
Frequency 150 kilohertz
@h1Pair Number
@h1Capacitance@h2nF/km (nanofarad/mile)@h3Initial@h3Final
@h1Attenuation@h2dB/km (decibel/mile)@h3Initial@h3Final
        1 .... XXX .... XXX .... XXX .... XXX
        3 .... XXX .... XXX .... XXX .... XXX
        5 .... XXX .... XXX .... XXX .... XXX
        7 .... XXX .... XXX .... XXX .... XXX
        9 .... XXX .... XXX .... XXX .... XXX
        11 .... XXX .... XXX .... XXX .... XXX
        13 .... XXX .... XXX .... XXX .... XXX
        15 .... XXX .... XXX .... XXX .... XXX
        17 .... XXX .... XXX .... XXX .... XXX
        19 .... XXX .... XXX .... XXX .... XXX
        21 .... XXX .... XXX .... XXX .... XXX
        23 .... XXX .... XXX .... XXX .... XXX
        25 .... XXX .... XXX .... XXX .... XXX
        Average xAE8 .... XXX .... XXX .... XXX .... XXX
Footnote: Overall Percent Difference in Average xAE8     Capacitance:XXXXXX
(TABLE START)Conductance:XXXXXX
(TABLE END)
Environmental ConditioningXXXXXXX
Frequency 772 kilohertz
@h1Pair Number
@h1Capacitance@h2nF/km (nanofarad/mile)@h3Initial@h3Final
@h1Attenuation@h2dB/km (decibel/mile)@h3Initial@h3Final
        1 .... XXX .... XXX .... XXX .... XXX
        3 .... XXX .... XXX .... XXX .... XXX
        5 .... XXX .... XXX .... XXX .... XXX
        7 .... XXX .... XXX .... XXX .... XXX
        9 .... XXX .... XXX .... XXX .... XXX
        11 .... XXX .... XXX .... XXX .... XXX
        13 .... XXX .... XXX .... XXX .... XXX
        15 .... XXX .... XXX .... XXX .... XXX
        17 .... XXX .... XXX .... XXX .... XXX
        19 .... XXX .... XXX .... XXX .... XXX
        21 .... XXX .... XXX .... XXX .... XXX
        23 .... XXX .... XXX .... XXX .... XXX
        25 .... XXX .... XXX .... XXX .... XXX
        Average xAE8 .... XXX .... XXX .... XXX .... XXX
Footnote: Overall Percent Difference in Average xAE8     Capacitance:XXXXXX
(TABLE START)Conductance:XXXXXX
(TABLE END)
Environmental ConditioningXXXXXXX
Water Immersion Test (1 kilohertz)
@h1Pair Number
@h1Capacitance@h2nF/km (nanofarad/mile)@h3Initial@h324 Hours@h3Final
        1 .... XXX .... XXX .... XXX
        3 .... XXX .... XXX .... XXX
        5 .... XXX .... XXX .... XXX
        7 .... XXX .... XXX .... XXX
        9 .... XXX .... XXX .... XXX
        11 .... XXX .... XXX .... XXX
        13 .... XXX .... XXX .... XXX
        15 .... XXX .... XXX .... XXX
        17 .... XXX .... XXX .... XXX
        19 .... XXX .... XXX .... XXX
        21 .... XXX .... XXX .... XXX
        23 .... XXX .... XXX .... XXX
        25 .... XXX .... XXX .... XXX
        Average xAE8 .... XXX .... XXX .... XXX
Footnote: Overall
(TABLE START)Percent Difference in Average xAE8 XXXXXXX
(TABLE END)
Water Penetration Test
@h1
@h1Option A@h2End Leakage grams@h2Weight Gain grams
@h1Option B@h2End Leakage grams@h2Penetration mm (in.)
Control@rn,s_
Heat Age@rn,s_
Humidity Exposure@rn,s_
(TABLE START)
Temperature Cycling@rn,s_
(TABLE END)
Insulation Compression
@h1
@h1Failures
Control .... XXXXXXXX
Heat Age .... XXXXXXXX
Humidity Exposure .... XXXXXXXX
Temperature Cycling .... XXXXXXXX
(TABLE END)
(TABLE START)
Jacket Slip Strength @ 50C
@h1
@h1Load in newtons (pound-force)
Control .... XXXXXXXX
Heat Age .... XXXXXXXX
Humidity Exposure .... XXXXXXXX
(TABLE START)
Temperature Cycling .... XXXXXXXX
(TABLE END)
Filler Exudation (grams)
@h1
@h1
Heat Age .... XXXXXXXX
Humidity Exposure .... XXXXXXXX
(TABLE START)
Temperature Cycle .... XXXXXXXX
(TABLE END)
Surge Test (kilovolts)
@h1
@h1
Conductor to Conductor .... XXXXXXXX
Shield to Conductors .... XXXXXXXX
(TABLE END)
[58 FR 29338, May 20, 1993; 58 FR 32749, June 11, 1993; as amended at 60 FR 1711, Jan. 5, 1995]
_1755.397  RUS performance specification for line concentrators.
        (a) General. (1) This section covers general requirements for a line concentrator (LC) system. This system shall operate in accordance with the manufacturer's specifications. Reliability shall be of prime importance in the design, manufacture and installation of the equipment. The equipment shall automatically provide for:
        (i) Terminating subscriber lines at a location remote from the serving central office;
        (ii) Concentrating the subscriber lines over a few transmission and supervisory paths to the serving central office; and
        (iii) Terminating the lines at the central office without loss of individual identity. A subscriber connected to a line concentrator shall be capable of having essentially the same services as a subscriber connected directly to the central office equipment (COE). Intra-unit calling among subscribers connected to the concentrator may be provided, but is not required.
        (2) Industry standards, or portions thereof, referred to in this paragraph (a) are incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552 (a) and 1 CFR part 51. Copies of these standards are available for inspection during normal business hours at RUS, room 2838, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
        (3) American National Standards Institute (ANSI) standards are available from ANSI Inc., 11 West 42nd Street, 13th floor, New York, NY 10036, telephone 212 - 642 - 4900.
        (i) ANSI Standard S1.4 - 1983, Specification for Sound Level Meters, including Amendment S1.4A - 1985.
        (ii) [Reserved]
        (4) American Society for Testing Materials (ASTM) are available from 1916 Race Street, Philadelphia, PA 19103, telephone 215 - 299 - 5400.
        (i) ASTM Specification B33 - 91, Standard Specifications for Tinned Soft or Annealed Copper Wire for Electrical Purposes.
        (ii) [Reserved]
        (5) Bell Communications Research (Bellcore) standards are available from Bellcore Customer Service, 8 Corporate Place, Piscataway, NJ 08854, telephone 1 - 800 - 521 - 2673.
        (i) TR - TSY - 000008, Issue 2, August 1987, Digital Interface between the SLC 96 Digital Loop Carrier System and a Local Digital Switch.
        (ii) Bell Communications Research (Bellcore) document TR - TSY - 000057, Issue 1, April 1987, including Revision 1, November 1988, Functional Criteria for Digital Loop Carrier Systems.
        (iii) Bell Communications Research (Bellcore) Document TR - NWT - 000303, Issue 2, December 1992, including Revision 1, December 1993, Integrated Digital Loop Carrier System Generic Requirements, Objectives, and Interface.
        (6) Federal Standard H28, Screw-Thread Standards for Federal Services, March 31, 1978, including Change Notice 1, May 28, 1986; Change Notice 2, January 20, 1989; and Change Notice 3, March 12, 1990. Copies may be obtained from the General Services Administration, Specification Section, 490 East L'Enfant Plaza SW, Washington, DC 20407, telephone 202 - 755 - 0325.
        (7) IEEE standards are available from IEEE Service Center, 445 Hoes Lane, P.O. Box 1331, Piscataway, NJ 08854, telephone 1 - 800 - 521 - 2673.
        (i) IEEE Standard 455 - 1985, Standard Test Procedure for Measuring Longitudinal Balance of Telephone Equipment Operating in the Voice Band.
        (ii) [Reserved]
        (8) RUS standards are available from Publications and Directives Management Branch, Administrative Services Division, Rural Utilities Service, room 0180, South Building, U.S. Department of Agriculture, Washington, DC 20250 - 1500.
        (i) RUS Bulletin 345 - 50, PE - 60 (Sept 1979), RUS Specification for Trunk Carrier Systems.
        (ii) [Reserved]
        (b) Types of requirements. (1) Unless otherwise indicated, the requirements listed in this section are considered to be fixed requirements.
        (2) The concentrator system shall communicate with standard T1 digital transmission format at a minimum between the concentrator and central office terminals. Analog conversion functions at remote and central office terminals shall be capable of being eliminated to accommodate end-to-end digital transmission.
        (3) The LC shall operate properly as an integral part of the telephone network when connected to physical or carrier derived circuits and central offices meeting RUS specifications and other generally accepted telecommunications practices, such as Bellcore documents TR - NWT - 000303, Integrated Digital Loop Carrier System Generic Requirements, Objectives and Interface; TR - TSY - 000008, Digital Interface between the SLC 96 Digital Loop Carrier System and a Local Digital Switch; and TR - TSY - 000057, Functional Criteria for Digital Loop Carrier Systems.
        (4) For RUS acceptance consideration of a LC, the manufacturer must certify and demonstrate that all requirements specified in this section are available and in compliance with this section.
        (5) Certain requirements are included in this section for features which may not be needed for every application. Such features are identifiable by the inclusion in the requirements of some such phrase as ``when specified by the owner'' or ``as specified by the owner.'' In some cases where an optional feature will not be required by an owner, either now or in the future, a system which does not provide this feature shall be considered to be in compliance with the specification for the specific installation under consideration, but not in compliance with the entire specification.
        (6) The owner may properly request bids from any supplier of an RUS accepted LC whose system provides all the features which will be required for a specific installation.
        (7) When required by the owner, the supplier shall state compliance to the Carrier Serving Area (CSA) requirements, as stated in Bell Communications Research (Bellcore) Standard TR - TSY - 000057, Functional Criteria for Digital Loop Carrier Systems.
        (c) Reliability. (1) The failure rate of printed circuit boards shall not exceed an average of 2.0 percent per month of all equipped cards in all system terminals during the first 3 months after cutover, and shall not exceed an average of 1.0 percent per month of all equipped cards in all system terminals during the second 3-month period. The failure rate for the equipment shall be less than 0.5 percent per month of all equipped cards in all system terminals after 6 months. A failure is considered to be the failure of a component on the PC board which requires it to be repaired or replaced.
        (2) The line concentrator terminal units shall be designed such that there will be no more than 4 hours of total outages in 20 years.
        (d) System type acceptance tests. General test results will be required on each system type. Any system provided in accordance with this section shall be capable of meeting any requirement in this section on a spot-check basis.
        (e) Features required. The network control equipment and peripheral equipment shall be comprised of solid-state and integrated circuitry components as far as practical and in keeping with the state-of-the-art and economics of the subject system.
        (f) Subscriber lines -- (1) General. (i) The remote LC units shall operate satisfactorily with subscriber lines which meet all of the conditions under the bidder's specifications and all the requirements of this section. This section recognizes that the loop limit of the line concentrator is dependent upon the transmission facility between the LC central office termination and the LC remote unit. When voice frequency (physical) circuits are used, the loop limit from the COE to the subscriber shall be 1900 ohms (including the telephone set). When electronically derived circuits (carrier, lightwave, etc.) are used, the loop limits of the electronic system will control. The bidder shall identify the loop limits of the equipment to be supplied.
        (ii) There should be provisions for such types of lines as ground start, loop start, regular subscriber, pay stations, etc.
        (2) Dialing. (i) General. The line concentrator remote and central office terminal equipment shall satisfactorily transmit dialing information when used with subscriber dials having a speed of operation between 8 and 12 dial pulses per second and a break period of 55 to 65% of the total signaling period.
        (ii) Subscriber dial interdigital time. The remote and central office LC equipment shall permit satisfactory telecommunications operation when used with subscriber rotary dial interdigital times of 200 milliseconds minimum, and pushbutton dialing with 50 milliseconds minimum.
        (iii) Subscriber line pushbutton dialing frequencies. The frequency pairs assigned for pushbutton dialing when provided by the central office shall be as listed in this paragraph (f)(2)(iii), with an allowable
(TABLE START)variation of 1B1.5 percent:
@h1Low group frequencies (Hz)
@h1High group frequencies (Hz) @h21209 @h21336 @h21477 @h21633
697  .... 1  .... 2  .... 3  .... Spare.
770  .... 4  .... 5  .... 6  .... Spare.
852  .... 7  .... 8  .... 9  .... Spare.
941  .... *  .... 0  .... #  .... Spare.
(TABLE END)
        (3) Ringing. (i) When LC ringing is generated at the remote end, it shall be automatic and intermittent and shall be cut off from the called line upon removal of the handset at the called station during either the ringing or silent period.
        (ii) When ringing generators are provided in the LC on an ancillary basis, they shall be accepted or technically accepted by RUS.
        (iii) Where ringing is generated at the remote end, the ringing system shall provide sufficient ringing on a bridged basis over the voltage and temperature limits of this specification and over subscriber loops within the limits stated by the manufacturer. The manufacturer shall state the minimum number (not less than two) of main station ringers that can be used for each ringing option available.
        (g) Traffic. (1)(i) The minimum grade of service for traffic in the line concentrator shall be B=.005 using the Traffic Table, based on the Erlang Lost-Calls-Cleared Formula. Required grade of service, traffic assumptions and calculations for the particular application being implemented shall be supplied by the bidder.
        (ii) Service to customers served by a traffic sensitive LC should not be noticeably different than the service to customers served by the dedicated physical pairs from the central office so that uniform grade of service will be provided to all customers in any class of service. Reference _1755.522(p)(1)(i), RUS General Specification for Digital, Stored Program Controlled Central Office Equipment.
        (2) Traffic and Plant Registers. Traffic measurements consist of three types -- peg count, usage, and congestion. A peg count register scores one count per call attempt per circuit group such as trunks, digit receivers, senders, etc. Usage counters measure the traffic density in networks, trunks and other circuit groups. Congestion registers score the number of calls which fail to find an idle circuit in a trunk group or to find an idle path through the switching network when attempting to connect two given end points. These conditions constitute ``network blocking.''
        (3) When required, traffic data will be stored in electronic storage registers or a block of memory consisting of one or more traffic counters for each item to be measured. The bidder shall indicate what registers are to be supplied, their purpose and the means for displaying the information locally (or at a remote location when available).
        (h) Transmission requirements. (1) General. Unless otherwise stated, the requirements in paragraphs (h) (2) through (20) of this section are specified in terms of analog measurements made from Main Distributing Frame (MDF) terminals to MDF terminals excluding cabling loss.
        (2) Telephone transmitter battery supply. A minimum of 20 milliamperes, dc, shall be provided for the transmitter of the telephone set at the subscriber station under all loop conditions specified by the bidder. The telephone set is assumed to have a resistance of 200 ohms.
        (3) Impedance -- subscriber loops. For the purpose of this section, the input impedance of all subscriber loops served by the equipment is arbitrarily considered to be 900 ohms in series with 2.16 microfarad capacitor at voice frequencies.
        (4) Battery noise. Noise across the remote terminal battery at power panel distribution bus terminals shall not exceed 35 dBrnC during the specified busy hour.
        (5) Stability. The long-term allowable variation in loss through the line concentrator system shall be 1B0.5 dB from the loss specified by the bidder.
        (6) Return loss. The specified return loss values are determined by the service and type of port at the measuring end. Two-wire ports are measured at 900 ohms in series with 2.16 microfarads, and 4-wire ports are measured at 600 ohms resistive. When other balance networks are supplied, test equipment arranged for operation with the supplied network(s) may be used. The requirement given shall meet the following cited values on each balance network available in the system:
Line-to-Line or Line-to-Trunk (2 - Wire)
Echo Return Loss (ERL) -- 18 dB, Minimum
Singing Return Loss (SRL) -- Low -- 15 dB, Minimum
Singing Return Loss (SRL) -- High -- 18 dB, Minimum
        (7) Longitudinal balance. The minimum longitudinal balance, with dc loop currents between 20 to 70 mA, shall be 60 dB at all frequencies between 60 and 2000 Hz, 55 dB at 2700 Hz and 50 dB at 3400 Hz. The method of measurement shall be as specified in the IEEE standard 455, ``Standard Testing Procedure for Measuring Longitudinal Balance of Telephone Equipment Operating in the Voice Band.'' Source voltage level shall be 10 volts root mean square (rms) where conversation battery feed originates at the remote end.
        (8) 60 hz longitudinal current immunity. The LC 60 Hz longitudinal current immunity shall be measured in accordance with Figure 1 of this section. Under test conditions cited on Figure 1 of this section, the system noise shall be 23 dBrnC or less as follows:
E:\GRAPHICS\ER29AU95.002
        (9) Steady noise (idle channel at 900 ohm impedance). Steady noise: Measure on terminated call. Noise measurements shall comply with the following:
Maximum -- 23 dBrnC0
Average -- 18 dBrnC0 or Less
3KHz Flat -- Less than 35 dBrnO as an Objective
        (10) Impulse noise. LC central office terminal equipment shall have an impulse noise limit of not more than five counts exceeding 54 dBrnC0 voice band weighted in a 5-minute period on six such measurements made during the busy hour. A WILCOM T - 194C Transmission Test Set, or equivalent, should be used for the measurements. The measurement shall be made by establishing a normal connection from the noise counter through the switching equipment in its off-hook condition to a quiet termination of 900 ohms impedance. Office battery and signaling circuit wiring shall be suitably segregated from voice and carrier circuit wiring, and frame talking battery filters provided, if and as required, in order to meet these impulse noise limits.
        (11) Crosstalk coupling. Worst case equal level crosstalk shall be 65 dB minimum in the range 200 to 3400 Hz. This shall be measured between any two paths through the system by connecting a 0 dBm0 level tone to the disturbing pair.
        (12) Digital error rate. The digital line concentrator shall not introduce more than one error in 10\8\ bits averaged over a 5-minute period, excluding the least significant bit.
        (13) Quantizing distortion. (i) The system shall meet the
(TABLE START)following requirements:
@h1Input level (dBm0) 1004 or 1020 Hz
@h1Minimum signal to distortion with C-message weighting
0 to 30  .... 33 dB
30 to 40  .... 27 dB
40 to 45  .... 22 dB
(TABLE END)
        (ii) Due to possible loss of the least significant bit on direct digital connections, a signal to distortion degradation of up to 2 dB may be allowed where adequately justified by the bidder.
        (14) Overload level. The overload level shall be +3 dBm0.
        (15) Gain tracking (linearity) shall meet the following
(TABLE START)requirements:
@h1Input signal level\1\
@h1Maximum gain deviation
+3 to 37 dBm0  .... 1B0.5 dB
37 to 50 dBm0  .... 1B1 dB
Footnote: \1\1004 Hz reference at 0 dBm0.
(TABLE END)
        (16) Frequency response (loss relative to 1004 Hz) for line-to-line (via trunk group or intra-link) connections shall meet the following
(TABLE START)requirements:
@h1Frequency (Hz)
@h1Loss at 0 dBm0 input\1\
60  .... 20 dB Min.\2\
300  .... 1 to +3 dB
600 to 2400  .... +1 dB
3400  .... 1 to +3 dB
Footnote: \1\() means less loss and (+) means more loss.
Footnote: \2\Transmit End.
(TABLE END)
        (17) Envelope delay distortion. On any properly established connection, the envelope delay distortion shall not exceed the following
(TABLE START)limits:
@h1Frequency (Hz)
@h1Microseconds
1000 to 2600  .... 190
800 to 2800  .... 350
600 to 3000  .... 500
400 to 3200  .... 700
(TABLE END)
        (18) Absolute delay. The absolute one-way delay through the line concentrator, excluding delays associated with the central office switching equipment, shall not exceed 1000 microseconds analog-to-analog measured at 1800 Hz.
        (19) Insertion loss. The insertion loss in both directions of transmission at 1004 Hz shall be included in the insertion loss requirements for the connected COE switch and shall not increase the overall losses through the combined equipment beyond the values for the COE alone, when operated through a direct digital interface. Systems operated with a (VF) line circuit interface may introduce up to 3 dB insertion loss. Reference _1755.522(q)(3).
        (20) Detailed requirements for direct digital connections. (i) This paragraph (h)(20) covers the detailed requirements for the provision of interface units which will permit direct digital connection between the host central office and line concentrator subscriber terminals over digital facilities. The digital transmission system shall be compatible with T1 type span lines using a DS1 interface and other digital interfaces that may be specified by the owner. The RUS specification for the T1 span line equipment is PE - 60. Other span line techniques may also be used. Diverse span line routing may be used when specified by the owner.
        (ii) The output of a digital-to-digital port shall be Pulse Code Modulation (PCM), encoded in eight-bit words using the mu - 255 encoding law and D3 encoding format, and arranged to interface with a T1 span line.
        (iii) Signaling shall be by means of Multifrequency (MF) or Dual Pulsing (DP) and the system which is inherent in the A and B bits of the D3 format. In the case where A and B bits are not used for signaling or system control, these bits shall only be used for normal voice and data transmission.
        (iv) When a direct digital interface between the span line and the host central office equipment is to be implemented, the following requirements shall be met:
        (A) The span line shall be terminated in a central office as a minimum a DS1 (1.544Mb/s) shall be provided;
        (B) The digital central office equipment shall be programmed to support the operation of the digital port with the line concentrator subscriber terminal;
        (C) The line concentrator subscriber terminal used with a direct digital interface shall be interchangeable with the subscriber terminal used with a central office terminal.
        (i) Alarms. The system shall send alarms for such conditions as blown fuses, blocked controls, power failure in the remote terminal, etc., along with its own status indication and status of dry relay contact closures or solid-state equivalent to the associated central office alarm circuits. Sufficient system alarm points shall be provided from the remote terminal to report conditions to the central office alarm system. The alarms shall be transmitted from the remote terminal to the central office terminal as long as any part of the connecting link is available for this transmission. Fuses shall be of the alarm and indicator type, and their rating designated by numerals or color code on fuse positions.
        (j) Electrical protection -- (1) Surge protection. (i) Adequate electrical protection of line concentrator equipment shall be included in the design of the system. The characteristics and application of protection devices must be such that they enable the line concentrator equipment to withstand, without damage or excessive protector maintenance, the dielectric stresses and currents that are produced in line-to-ground and tip-to-ring circuits through the equipment as a result of induced or conducted lightning or power system fault-related surges. All wire terminals connected to outside plant wire or cable pairs shall be protected from voltage and current surges.
        (ii) Equipment must pass laboratory tests, simulating a hostile electrical environment, before being placed in the field for the purpose of obtaining field experience. For acceptance consideration RUS requires manufacturers to submit recently completed results (within 90 days of submittal) of data obtained from the prescribed testing. Manufacturers are expected to detail how data and tests were conducted. There are five basic types of laboratory tests which must be applied to exposed terminals in an effort to determine if the equipment will survive. Figure 2 of this section, Summary of Electrical Requirements and Tests, identifies the tests and their
(TABLE START)application as follows:
Figure 2. -- Summary of Electrical Requirements and Tests
@h1Test
@h1Application criteria
@h1Peak voltage or current
@h1Surge waveshape
@h1Number of applications and maximum time between
@h1Comments
Current surge .... Low impedance paths exposed to surges .... 500A or lesser current (see fig. 4) .... 100A1000 _s .... 5 each polarity at 1 minute intervals .... None.
60 Hz current carrying .... High or low impedance paths exposed to surges .... 10A rms or lesser current (see fig. 6) .... 11 Cycles of 60 Hz (0.183 Sec.) .... 3 each at 1 minute intervals .... None.
AC Power service surge voltage .... AC power service connection .... 2500V or +3 s clamping V of arrester employed at 10kV/_s .... 1.20A50 _s .... 5 each polarity at 1 minute intervals .... AC arrester, if used, must be removed. Communications line arresters, if used, remain in place.
Voltage surge .... High impedance paths exposed to surges .... 1000V or +3 s dc breakdown of arrester employed .... 100A1000 _s .... 5 each polarity at 1 minute intervals .... All primary arresters, if used, must be removed.
Arrester response delay .... Paths protected by arresters, such as gas tubes, with breakdown dependent on V. rate of rise .... +3 s breakdown of arrester employed at 100V/_s of rise .... 100V/_s rise decay to \1/2\ V. in tube's delay time .... 5 each polarity at 1 minute intervals .... All primary arrestors, if used, must be removed.
(TABLE END)
        (iii) Electrical protection requirements for line concentrator equipment can be summarized briefly as follows:
        (A) Current surge tests simulate the stress to which a relatively low impedance path may be subjected before main frame protectors break down. Paths with a 100 Hz impedance of 50 ohms or less shall be subjected to current surges, employing a 10 x 1000 microsecond waveshape as defined in Figure 3 of this section, Surge Waveshape. For the purpose of determining this impedance, arresters which are mounted within the equipment are to be considered zero impedance. The crest current shall not exceed 500A; however, depending on the impedance of the test specimen this value of current may be lower. The crest current through the sample, multiplied by the sample's 100 Hz impedance, shall not exceed 1000 V. Where sample impedance is less than 2 ohms, peak current shall be limited to 500A as shown in Figure 4 of this section, Current Surge Tests. Figures 3 and 4 follow:
E:\GRAPHICS\ER29AU95.003
E:\GRAPHICS\ER29AU95.004
        (B) Sixty Hertz (60 Hz) current carrying tests shall be applied to simulate an ac power fault which is conducted to the unit over the cable pairs. The test shall be limited to 10 amperes Root Mean Square (rms) of 60 Hz ac for a period of 11 cycles (0.1835 seconds) and shall be applied longitudinally from line to ground.
        (C) AC power service surge voltage tests shall be applied to the power input terminals of ac powered devices to simulate switching surges or lightning-induced transients on the ac power system. The test shall employ a 1.2 x 50 microsecond waveshape with a crest voltage of 2500 V. Communications line protectors may be left in place for these tests.
        (D) Voltage surge tests which simulate the voltage stress to which a relatively high impedance path may be subjected before primary protectors break down and protect the circuit. To ensure coordination with the primary protection while reducing testing to the minimum, voltage surge tests shall be conducted at a 1000 volts with primary arresters removed for devices protected by carbon blocks, or the +3 sigma dc breakdown voltage of other primary arresters. Surge waveshape should be 10 x 1000 microseconds.
        (E) Arrester response delay tests are designed to stress the equipment in a manner similar to that caused by the delayed breakdown of gap type arresters when subjected to rapidly rising voltages. Arresters shall be removed for these tests, the peak surge voltage shall be the +3 sigma breakdown voltage of the arrester in question on a voltage rising at 100 V per microsecond, and the time for the surge to decay to half voltage shall equal at least the delay time of the tube as explained in Figure 5 of this section, Arrester Response Delay Time as follows:
E:\GRAPHICS\ER29AU95.005
        (iv) Tests shall be conducted in the following sequence. As not all tests are required in every application, non-applicable tests should be omitted:
        (A) Current Impulse Test;
        (B) Sixty Hertz (60 Hz) Current Carrying Tests;
        (C) AC Power Service Impulse Voltage Test;
        (D) Voltage Impulse Test; and
        (E) Arrester Response Delay Time Test.
        (v) A minimum of five applications of each polarity for the surge tests and three for the 60 Hz Current Carrying Tests are the minimum required. All tests shall be conducted with not more than 1 minute between consecutive applications in each series of three or five applications to a specific configuration so that heating effects will be cumulative. See Figure 6 of this section, 60 Hz Current Surge Tests as follows:
E:\GRAPHICS\ER29AU95.006
        (vi) Tests shall be applied between each of the following terminal combinations for all line operating conditions:
        (A) Line tip to ring;
        (B) Line ring to ground;
        (C) Line tip to ground; and
        (D) Line tip and ring tied together to ground.
        (2) Dielectric strength. (i) Arresters shall be removed for all dielectric strength tests.
        (ii) Direct current potentials shall be applied between all line terminals and the equipment chassis and between these terminals and grounded equipment housings in all instances where the circuitry is dc open circuit from the chassis, or connected to the chassis through a capacitor. The duration of all dielectric strength tests shall be at least 1 second. The applied potential shall be at a minimum equal to the plus 3 sigma dc breakdown voltage of the arrester, provided by the line concentrator manufacturer.
        (3) Insulation resistance. Following the dielectric tests, the insulation resistance of the installed electrical circuits between wires and ground, with the normal equipment grounds removed, shall not be less than 10 megohms at 500 volts dc at a temperature of 68 _F (20 _C) and at a relative humidity of approximately 50 percent. The measurement shall be made after the meter stabilizes, unless the requirement is met sooner. Arresters shall be removed for these tests.
        (4) Self-protection. (i) All components shall be capable of being continuously energized at rated voltage without injury. Design precautions must be taken to prevent damage to other equipment components when a particular component fails.
        (ii) Printed circuit boards or similar equipment employing electronic components should be self-protecting against external grounds applied to the connector terminals. Board components and coatings applied to finished products shall be of such material or so treated that they will not support combustion.
        (iii) Every precaution shall be taken to protect electrostatically sensitive components from damage during handling. This shall include written instructions and recommendations.
        (k) Miscellaneous -- (1) Interconnect wire. All interconnect wire shall be of soft annealed tinned copper wire meeting the requirements of ASTM Specification B33 - 91 and of suitable cross-section to provide safe current carrying capacity and mechanical strength. The insulation of installed wire, connected to its equipment and frames, shall be capable of withstanding the same insulation resistance and dielectric strength requirements as given in paragraphs (j)(2) and (j)(3) of this section at a temperature of 120_F (49_C), and a relative humidity of 90 percent.
        (2) Wire wrapped terminals. These terminals are preferred and where used shall be of a material suitable for wire wrapping. The connections to them shall be made with a wire wrapping tool with the following minimum number of successive non-overlapping turns of bare tinned copper wire in contact with each terminal:
        (i) 6 turns of 30 gauge;
        (ii) 6 turns of 26 gauge;
        (iii) 6 turns of 24 gauge; or
        (iv) 5 turns of 22 gauge.
        (3) Protection against corrosion. All metal parts of equipment frames, distributing frames, cable supporting framework and other exposed metal parts shall be constructed of corrosion resistant materials or materials plated or painted to render them adequately corrosion resistant.
        (4) Screws and bolts. Screw threads for all threaded securing devices shall be of American National Standard form in accordance with Federal Standard H28, unless exceptions are granted to the manufacturer of the switching equipment. All bolts, nuts, screws, and washers shall be of nickel-copper alloy, steel, brass or bronze.
        (5) Environmental requirements. (i) The bidder shall specify the environmental conditions necessary for safe storage and satisfactory operation of the equipment being bid. If requested, the bidder shall assist the owner in planning how to provide the necessary environment for the equipment.
        (ii) To the extent practicable, the following temperature range objectives shall be met:
        (A) For equipment mounted in central office and subscriber buildings, the carrier equipment shall operate satisfactory within an ambient temperature range of 32 _F to 120 _F (0 _C to 49 _C) and at 80 percent relative humidity between 50 _F and 100 _F (10 _C and 38 _C); and
        (B) Equipment mounted outdoors in normal operation (with cabinet doors closed) shall operate satisfactorily within an ambient temperature range (external to cabinet) of 40 _F to 140 _F (40 _C to 60 _C) and at 95 percent relative humidity between 50 _F to 100 _F (10 _C to 38 _C). As an alternative to the (60 _C) requirement, a maximum ambient temperature of 120 _F (49 _C) with equipment (cabinet) exposed to direct sunlight may be substituted.
        (6) Stenciling. Equipment units and terminal jacks shall be adequately designated and numbered. They shall be stenciled so that identification of equipment units and leads for testing or traffic analysis can be made without unnecessary reference to prints or descriptive literature.
        (7) Quantity of equipment bays. Consistent with system arrangements and ease of maintenance, space shall be provided on the floor plan for an orderly layout of future equipment bays. Readily accessible terminals will be provided for connection to interbay and frame cables to future bays. All cables, interbay and intrabay (excluding power), if technically feasible, shall be terminated at both ends by connectors.
        (8) Radio and television interference. Measures shall be employed by the bidders to limit the radiation of radio frequencies generated by the equipment so as not to interfere with radio, television receivers, or other sensitive equipment.
        (9) Housing. (i) When housed in a building supplied by the owner, a complete floor plan including ceiling height, floor loading, power outlets, cable entrances, equipment entry and travel, type of construction, and other pertinent information shall be supplied.
        (ii) In order to limit corrosion, all metal parts of the housing and mounting frames shall be constructed of suitable corrosion resistant materials or materials protectively coated to render them adequately resistant to corrosion under the climatic and atmospheric conditions existing in the area in which the housing is to be installed.
        (10) Distributing frame. (i) The line concentrator terminal equipment located at the central office shall be protected by the central office main distribution frame. The bidder may supply additional protection capability as appropriate. All protection devices (new or existing) shall be arranged to operate in a coordinated manner to protect equipment, limit surge currents, and protect personnel.
        (ii) The distributing frame shall provide terminals for terminating all incoming cable pairs. Arresters shall be provided for all incoming cable pairs, or for a smaller number of pairs if specified.
        (iii) The current carrying capacity of each arrester and its associated mounting shall coordinate with a #22 gauge copper conductor without causing a self-sustaining fire or permanently damaging other arrester positions. Where all cable pairs entering the housing are #24 gauge or finer, the arresters and mountings need only coordinate with #24 gauge cable conductors.
        (iv) Remote terminal protectors may be mounted and arranged so that outside cable pairs may be terminated on the left or bottom side of protectors (when facing the vertical side of the MDF) or on the back surface of the protectors. Means for easy identification of pairs shall be provided.
        (v) Protectors shall have a ``dead front'' (either insulated or grounded) where live metal parts are not readily accessible.
        (vi) Protectors shall be provided with an accessible terminal of each incoming conductor which is suitable for the attachment of a temporary test lead. They shall also be constructed so that auxiliary test fixtures may be applied to open and test the subscriber's circuit in either direction. Terminals shall be suitable for wire wrapped connections or connectorized.
        (vii) If specified, each protector group shall be furnished with a factory assembled tip cable for splicing to the outside cable; the tip cable shall be 20 feet (6.1 m) in length, unless otherwise specified. Tip cable used shall be RUS accepted.
        (viii) Protector makes and types used shall be RUS accepted.
        (l) Power equipment -- (1) General. When specified, batteries and charging equipment shall be supplied for the remote terminal of the line concentrator.
        (2) Operating voltage. (i) The nominal operating voltage of the central office and remote terminal shall be 48 volts dc, provided by a battery with the positive side tied to system ground.
        (ii) Where equipment is dc powered, it must operate satisfactorily over a range of 50 volts 1B 6 volts dc.
        (iii) Where equipment is ac powered, it must operate satisfactorily over a range of 1201B10 volts or 2201B10 volts ac.
        (3) Batteries. (i) Unless otherwise specified by the owner, sealed batteries shall be supplied for the remote line concentrator terminal.
        (ii) The batteries shall have an ampere hour load capacity of no less than 8 busy hours. When an emergency ac supply source is available, the battery reserve may be reduced to 3 busy hours.
        (iii) The batteries shall be sealed when they are mounted in the cabinet with the concentrator equipment.
        (iv) When specified by the owner, battery heaters shall be supplied in a bidder-furnished housing.
        (4) Charging equipment. (i) One charger capable of carrying the full dc power load of the remote terminal shall be supplied unless otherwise specified by the owner.
        (ii) Charging shall be on a full float basis. The rectifiers shall be of the full wave, self-regulating, constant voltage, solid-state type and shall be capable of being turned on and off manually.
        (iii) When charging batteries, the voltage at the battery terminals shall be adjustable and shall be set at the value recommended for the particular battery being charged, provided it is not above the maximum operating voltage of the central office switching equipment. The voltage shall not vary more than 1B0.02 volt dc per cell between 10% load and 100% load. Between 3% and 10% load, the output voltage shall not vary more than 1B0.04 volt dc per cell. Beyond full load current the output voltage shall drop sharply. The above output voltage shall be maintained with input line voltage variations of plus or minus 10 percent. Provision shall be made to manually change the output voltage of the rectifier to 2.25 volts per cell to provide an equalization charge on the battery.
        (iv) The charger noise, when measured with a suitable noise measuring set and under the rated battery capacitance and load conditions, shall not exceed 22 dBrnC. See Figure 7 of this section, Charger Noise Test as follows:
E:\GRAPHICS\ER29AU95.007
        (v) The charging equipment shall be provided with a means for indicating a failure of charging current whether due to ac power failure, an internal failure in the charger, or to other circumstances which might cause the output voltage of the charger to drop below the battery voltage. Where a supplementary constant current charger is used, an alarm shall be provided to indicate a failure of the charger.
        (vi) Audible noise developed by the charging equipment shall be kept to a minimum. Acoustic noise resulting from operation of the rectifier shall be expressed in terms of dB indicated on a sound level meter conforming to American National Standards Institute S1.4, and shall not exceed 65 dB (A-weighting) measured at any point 5 feet (1.5m) from any vertical surface of the rectifier.
        (vii) The charging equipment shall be designed so that neither the charger nor the central office equipment is subject to damage in case the battery circuit is opened for any value of load within the normal limits.
        (5) Power panel. (i) Battery and charger control switches, dc voltmeters, dc ammeters, fuses and circuit breakers, supervisory and timer circuits shall be provided as required. Portable or panel mounted frequency meters or voltmeters shall be provided as specified by the owner.
        (ii) Power panels, cabinets and shelves, and associated wiring shall be designed initially to handle the line concentrator terminal when it reaches its ultimate capacity as specified by the owner.
        (iii) The power panel shall be of the ``dead front'' type.
        (6) Ringing equipment. The ringing system shall provide sufficient ringing on a bridged basis over the voltage and temperature limits of this section and over subscriber drops within the limits stated by the bidder. The ringing system shall be without operational problems such as bell tapping during dialing. The bidder shall state the minimum number (not less than two) of main station ringers that can be used for each ringing option available.
        (7) Interrupter equipment. The interrupter may be an integral part of the system or may be part of the associated central office equipment connected to the line concentrator central office terminal.
        (8) Special systems. Manufacturers of LC systems that operate by extending ringing current from the central office shall state their required input ringing (voltage and frequency) and the limitations on the connected subscriber loop.
        (m) Fusing requirements -- (1) General. (i) The equipment shall be completely wired and equipped with fuses, trouble signals, and all associated equipment for the wire capacity of the frames or cabinets provided.
        (ii) Design precautions shall be taken to prevent the possibility of equipment damage arising from the insertion of an electronic package into the wrong connector or the removal of a package from any connector or improper insertion of the correct card in its connector.
        (2) Fuses. Fuses and circuit breakers shall be of an alarm and indicator type, except where the fuse or breaker location is indicated on the alarm printout. Their rating shall be designated by numerals or color codes on the fuse or the panel.
        (n) Trouble location and test -- (1) Equipment. (i) Trouble indications in the system may be displayed in the form of lights on the equipment units or printed circuit boards.
        (ii) When required, a jack or other connector shall be provided to connect a fault or trouble recorder (printer or display).
        (2) Maintenance system. (i) The maintenance system shall monitor and maintain the system operation without interruption of call processing except for major failures.
        (ii) The maintenance system shall be arranged to provide the ability to determine trouble to an individual card, functional group of cards, or other equipment unit.
        (o) Spare parts. Lists of spare parts and maintenance tools as recommended by the bidder shall be provided. The cost of such tools and spare parts shall be indicated and shall not be included in the base price.
        (p) Drawings and printed material. (1) The bidder shall supply instructional material for each line concentrator system involved at the time of delivery of the equipment. It is not the intent of this section to require system documentation necessary for the repair of individual circuit boards.
        (2) Three complete sets of legible drawings shall be provided for each central office to be accessed. Each set shall include all of the following:
        (i) Drawings of major equipment items such as frames, with the location of major component items of equipment shown therein;
        (ii) Wiring diagrams indicating the specific method of wiring used on each item of equipment and interconnection wiring between items of equipment;
        (iii) Maintenace drawings covering each equipment item that contains replaceable parts, appropriately identifying each part by name and part number; and
        (iv) Job drawings including all drawings that are individual to the particular line concentrator involved such as mainframe, power equipment, etc.
        (3) The following information shall also be furnished:
        (i) A complete index of required drawings;
        (ii) An explanation of electrical principles of operation of overall concentrator system;
        (iii) A list of tests which can be made with each piece of test equipment furnished and an explanation of the method of making each test;
        (iv) A sample of each form recommended for use in keeping records;
        (v) The criteria for analyzing results of tests and determining appropriate corrective action;
        (vi) A set of general notes on methods of isolating equipment faults to specific printed circuit cards in the equipment;
        (vii) A list of typical troubles which might be encountered, together with general indications as to probable location of each trouble; and
        (viii) All special line concentrator system grounding requirements.
        (4) When installation is to be done by the bidder a complete set of drawings shall be provided by the owner, such as floor plans, lighting, grounding and ac power access.
        (q) Installation and acceptance -- (1) General. Paragraphs (q)(2)(i) through (q)(3)(xxi) of this section covers the general requirements for the installation of line concentrator equipment by the bidder, and outlines the general conditions to be met by the owner in connection with such installation work. The responsibilities apply in both the central office installation and remote terminal installations, unless otherwise noted.
        (2) Responsibilities of owner. The owner shall:
        (i) Allow the bidder and its employees free access to the premises and facilities at all hours during the progress of the installation;
        (ii) Provide access to the remote site and any other site for development work needed during the installation;
        (iii) Take such action as necessary to ensure that the premises are dry and free from dust and in such condition as not to be hazardous to the installation personnel or the material to be installed (not required when remote terminal is not installed in a building);
        (iv) Provide heat or air conditioning when required and general illumination in rooms in which work is to be performed or materials stored;
        (v) Provide suitable openings in buildings to allow material to be placed in position (not required when a remote terminal is not installed in a building);
        (vi) Provide the necessary conduit and commercial and dc-ac inverter output power to the locations shown on the approved floor plan drawings;
        (vii) Provide 110 volts a.c., 60 Hz commercial power equipped with a secondary arrester and a reasonable number of outlets for test, maintenance and installation equipment;
        (viii) Provide suitable openings or channels and ducts for cables and conductors from floor to floor and from room to room;
        (ix) Provide suitable ground leads, as designated by the bidder (not required when remote terminal is not installed in a building);
        (x) Provide the necessary wiring, central office ground and commercial power service, with a secondary arrester, to the location of an exterior remote terminal installation based on the voltage and load requirements furnished voltage and load requirements furnished by the bidder;
        (xi) Test at the owners expense all lines and trunks for continuity, leakage and loop resistance and ensure that all lines and trunks are suitable for operation with the central office and remote terminal equipment specified;
        (xii) Make alterations and repairs to buildings necessary for proper installation of material, except to repair damage for which the bidder or its employees are responsible;
        (xiii) Connect outside cable pairs on the distributing frame (those connected to protectors);
        (xiv) Furnish all line, class of service assignment, and party line assignment information to permit bidder to program the data base memory within a reasonable time prior to final testing;
        (xv) Release for the bidder's use, as soon as possible, such portions of the existing plant as are necessary for the proper completion of such tests as require coordination with existing facilities including facilities for T1 span lines with properly installed repeaters between the central office and the remote terminal installations;
        (xvi) Make prompt inspections as it deems necessary when notified by the bidder that the equipment, or any part thereof, is ready for acceptance;
        (xvii) Provide adequate fire protection apparatus at the remote terminal, including one or more fire extinguishers or fire extinguishing systems of the gaseous type, that has low toxicity and effect on equipment;
        (xviii) Provide necessary access ports for cable, if underfloor cabling is selected;
        (xix) Install equipment and accessory plant devices mounted external to the central office building and external to the repeater and other outside housings including filters, repeater housings, splicing of repeater cable stubs, externally mounted protective devices and other such accessory devices in accordance with written instructions provided by the bidder; and
        (xx) Make all cross connections (at the MDF or Intermediate Distribution Frame IDF) between the physical trunk or carrier equipment and the central office equipment unless otherwise specified in appendix A of this section.
        (3) Responsibilities of bidder. The bidder shall:
        (i) Allow the owner and its representatives access to all parts of the building at all times;
        (ii) Obtain the owner's permission before proceeding with any work necessitating cutting into or through any part of the building structure such as girders, beams, concrete or tile floors, partitions or ceilings (does not apply to the installation of lag screws, expansion bolts, and similar devices used for fastening equipment to floors, columns, walls, and ceilings);
        (iii) Be responsible for and repair all damage to the building due to carelessness of the bidder's workforce, exercise reasonable care to avoid any damage to the owner's switching equipment or other property, and report to the owner any damage to the building which may exist or may occur during its occupancy of the building;
        (iv) Consult with the owner before cutting into or through any part of the building structure in all cases where the fireproofing or moisture proofing may be impaired;
        (v) Take necessary steps to ensure that all fire fighting apparatus is accessible at all times and all flammable materials are kept in suitable places outside the building;
        (vi) Not use gasoline, benzene, alcohol, naphtha, carbon tetrachloride or turpentine for cleaning any part of the equipment;
        (vii) Be responsible for delivering the CO and remote terminal equipment to the sites where they will be needed;
        (viii) Install the equipment in accordance with the specifications for the line concentrator;
        (ix) Have all leads brought out to terminal blocks on the MDF (or IDF if stated in appendix A of this section) and have all terminal blocks identified and permanently labeled;
        (x) Use separate shielded type leads grounded at one end only unless otherwise specified by the owner or bidder or tip cables meeting RUS cable crosstalk requirements for carrier frequencies inside the central office;
        (xi) Group the cables to separate carrier frequency, voice frequency, signaling, and power leads;
        (xii) Make the necessary power and ground connections (location as shown in appendix A of this section) to the purchaser's power terminals and ground bus unless otherwise stated in appendix A of this section (ground wire shall be 6 AWG unless otherwise stated);
        (xiii) Place the battery in service in compliance with the recommendations of the battery manufacturer;
        (xiv) Make final charger adjustments using the manufacturer's recommended procedure;
        (xv) Run all jumpers, except line and trunk jumpers (those connected to protectors) unless otherwise specified in appendix A of this section;
        (xvi) Establish and update all data base memories with subscriber information as supplied by the owner until an agreed turnover time;
        (xvii) Give the owner notice of completion of the installation at least one week prior to completion;
        (xviii) Permit the owner or its representative to conduct tests and inspections after installation has been completed in order that the owner may be assured the requirements for installation are met;
        (xix) Allow access, before turnover, by the owner or its representative, upon request, to the test equipment which is to be turned over as a part of the delivered equipment, to permit the checking of the circuit features which are being tested and to permit the checking of the amount of connected equipment to which the test circuits have access;
        (xx) Notify the owner promptly of the completion of work of the central office terminals, remote terminals or such portions thereof as are ready for inspection; and
        (xxi) Correct promptly all defects for which the bidder is responsible.
        (4) Information to be furnished by bidder. The bidder shall accompany its bid with the following information:
        (i) Two copies of the equipment list and the traffic calculations from which the quantities in the equipment list are determined;
        (ii) Two copies of the traffic tables from which the quantities are determined, if other than the Erlang B traffic tables;
        (iii) A block diagram of the line concentrator and associated maintenance equipment will be provided;
        (iv) A prescribed method and criteria for acceptance of the completed line concentrator which will be subject to review;
        (v) This special grounding requirements including the recommended configuration, suggested equipment and installation methods to be used to accomplish them;
        (vi) The special handling and equipment requirements to avoid damage resulting from the discharge of static electricity (see paragraph (j) (4) (iii) of this section) or mechanical damage during transit installation and testing;
        (vii) The location of technical assistance service, its availability and conditions for owner use and charges for the service by the bidder; and
        (viii) The identification of the subscriber loop limits available beyond the line concentrator.
        (5) Installation requirements. (i) All work shall be done in a neat, workmanlike manner. Equipment frames or cabinets shall be correctly located, carefully aligned, anchored, and firmly braced. Cables shall be carefully laid with sufficient radius of curvature and protected at corners and bends to ensure against damage from handling or vibration. Exterior cabinet installations for remote terminals shall be made in a permanent, eye-pleasing manner.
        (ii) All multiple and associated wiring shall be continuous, free from crosses, reverses, and grounds and shall be correctly wired at all points.
        (iii) An inspection shall be made by the owner or its representatives prior to performing operational and performance tests on the equipment, but after all installing operations which might disturb apparatus adjustments have been completed. The inspection shall be of such character and extent as to disclose with reasonable certainty any unsatisfactory condition of apparatus or equipment. During these inspections, or inspections for apparatus adjustments, or wire connections, or in testing of equipment, a sufficiently detailed examination shall be made throughout the portion of the equipment within which such condition is observed, or is likely to occur, to disclose the full extent of its existence, where any of the following conditions are observed:
        (A) Apparatus or equipment units failing to compare in quantity and type to that specified for the installation;
        (B) Apparatus or equipment units damaged or incomplete;
        (C) Apparatus or equipment affected by rust, corrosion or marred finish; and
        (D) Other adverse conditions resulting from failure to meet generally accepted standards of good workmanship.
        (6) Operational tests. (i) Operational tests shall be performed on all circuits and circuit components to ensure their proper functioning in accordance with appropriate explanation of the operation of the circuit.
        (ii) All equipment shall be tested to ensure proper operation with all components connected in all possible combinations and each line shall be tested for proper ring, ring trip and supervision.
        (iii) All fuses shall be verified for continuity and correct rating. Alarm indication shall be demonstrated for each equipped fuse position. An already failed fuse compatible with the fuse position may be used.
        (iv) Each alarm or signal circuit shall be checked for correct operation.
        (v) A sufficient quantity of locally originating and incoming calls shall be made to demonstrate the function of the line concentrator including all equipped transmission paths. When intra-link calling is supplied, all intra-link transmission paths shall be demonstrated.
        (7) Acceptance tests and data required. (i) Data shall be supplied to the owner by the bidder in writing as a part of the final documents in closing out the contract as follows:
        (A) A detailed cross connect drawing of alarm to power board, central office battery to physical trunks or carrier system, wiring options used in terminals, channels, filters, repeaters, etc., marked in the owner's copy of the equipment manual or supplied separately;
        (B) The measured central office supply voltages applied to the equipment terminals or repeaters at the time the jack and test point readings are made and ac supply voltages where equipment is powered from commercial ac sources;
        (C) A list of all instruments, including accessories, by manufacturer and type number, used to obtain the data; and
        (D) The measurements at all jack or test points recommended by the manufacturer, including carrier frequency level measurements at all carrier terminals and repeaters where utilized.
        (ii) Data in the form of a checklist or other notations shall be supplied showing the results of the operational tests.
        (iii) The bidder shall furnish to the owner a record of the battery cell or multicell unit voltages measured at the completion of the installation of the switching system before it is placed in commercial service. This is not required at a site where the owner furnishes dc power.
        (8) Joint inspection requirements. (i) The bidder shall notify the owner in writing at least one week before the date the complete system will be ready for inspection and tests. A joint inspection shall be made by the bidder and the owner (or owner's engineer) to determine that the equipment installation is acceptable. The inspection shall include physical inspection, a review of acceptance test data, operational tests, and sample measurements.
        (A) The owner shall review the acceptance test data and compare it to the requirements of this section.
        (B) Sample measurements shall be made on all systems installed under this contract. Test methods should follow procedures described in paragraph (g)(5) of this section.
        (C) A check shall be made of measured test point and jack readings for compliance with the manufacturer's specifications. This applies also to channels, terminals, carrier frequency repeaters, and fault locating circuits.
        (ii) In the event that the measured data or operational tests show that equipment fails to meet the requirements of this section, the deficiencies are to be resolved as set forth in Article II of the 397 Special Equipment Contract. (Copies are available from RUS, room 0174, U.S. Department of Agriculture, Washington, DC 20250 - 1500.) The reports of the bidder and the owner shall be detailed as to deficiencies, causes, corrective action necessary, corrective action to be taken, completion time, etc.
(The information and recordkeeping requirements of this section have been approved by the Office of Management and Budget (OMB) under the control number 0572 - 0059.)
Appendix A to _1755.397 -- Specification for Line Concentrator Detailed Equipment Requirements
(Information To Be Supplied by Owner)
Telephone Company (Owner)
Name:
Location:
Number of LC's Required: XXXX
(TABLE START)
Line Concentrator Locations:
@h1Location
@h1No. of Lines
@h1Central Office
  ....   ....
  ....   ....
  ....   ....
  ....   ....
(TABLE END)
1. General
        1.1 Notwithstanding the bidder's equipment lists, the equipment and materials furnished by the bidder must meet the requirements of paragraphs (a) through (p) of this section, and this appendix A.
        1.2 Paragraph (a) through (p) of this section cover the minimum general requirements for line concentrator equipment.
        1.3 Paragraph (q) of this section covers the requirements for installation, inspection and testing when such service is included as part of the contract.
        1.4 This appendix A covers the technical data for application engineering and detailed equipment requirements insofar as they can be established by the owner. This appendix A shall be filled in by the owner.
        1.5 Appendix B of this section covers detailed information on the line concentrator equipment, information on system reliability and traffic capacity as proposed by the bidder. Appendix B of this section is to be filled in by the bidder and must be presented with the bid.
Office Name
(By Location)
LC Designation
(TABLE START)
2. Number of Subscriber Lines
@h1
@h1Equipped
@h1Wired only
Single-Party  ....   ....
Pay Station (Type:XXXX) ....   ....
Other (Describe:XXXX)  ....  ....
Total  ....  ....
(TABLE END)
3. Loop Resistance
        3.1 Number of non-pay station lines having a loop resistance, including the telephone set as follows:
        3.1.1 For physical trunks between the remote and the office units,
(TABLE START)the loop resistance is to include the resistance of the trunk.
@h1
@h1No. of lines
1200 - 1900 ohms  ....
1901 - 3200 ohms  ....
3201 - 4500 ohms  ....
(TABLE END)
        3.1.2 Number of pay station lines having a loop resistance,
(TABLE START)excluding the telephone set, greater than:
@h1
@h1No. of lines
1200 ohms (Prepay)  ....
1000 ohms (Semi-Postpay)  ....
(TABLE END)
        When physical trunks are used, these resistances include that of the facility between the CO and the remote.
        3.1.3 Range extension equipment, if required, is to be provided:
XXXX By Bidder
XXXX By Owner
(Quantity and Type)
_
4. Traffic Data
        4.1 Average combined originating and terminating hundred call seconds (CCS) per line in the busy hour:
XXX CCS/Line. (Assume originating & terminating equal.)
        4.2 Percent Intra-Calling XXXX
        4.3 Total Busy Hour Calls XXXX
(TABLE START)
5. TYPE or RINGING
@h15.1 Frequency No.
@h11.
@h12.
@h13.
@h14.
Frequency (Hz)  ....  ....  ....  ....
Max. No. of Phones/Freq.  ....  ....  ....  ....
(TABLE END)
        5.2 Minimum ringing generator capacity to be supplied shall be sufficient to serve XXXX lines (each frequency).
6. Central Office Equipment Interface
        6.1 COE will be:
        6.1.1 COE Manufacturer
_
Type
Year
Generic
        6.1.2 XXXX See digital central office specification for the switchboard at XXXXXXXXXX .
        6.2 Interface will be:
6.2.1 XXXX Line Circuit(s)
6.2.2 XXXX Direct Digital Interface
6.2.3 XXXX Other (Describe)
_
_
        6.3 Mounting rack for line concentrator furnished by:
XXXX Bidder
XXXX Owner
(Specify width and height of rack available) (Width) (Height)
        6.4 Equipment to be installed in existing building:
XXXX Yes (Attach detailed plan)
XXXX No
7. Transmission Facilities
        7.1 Transmission facilities between the central office and remote terminals shall be:
        7.1.1 Type:
XXXXVF Carrier Derived Circuits
XXXXDigital Span Line (DS1)
XXXXOther
_
(Attach a layout of the transmission facilities between the central office and the remote terminals describing transmission and signaling parameters, routing and resistance where applicable.)
        7.1.2 Utilizes physical plant
XXXXCable Pairs (Existing/New)
XXXXOther
_
        Note: Unless otherwise stated, physical plant will be supplied by the owner.
        7.1.3 Terminal equipment for transmission facility to be supplied by:
XXXXOwner
XXXXBidder
        7.1.3.1 Carrier e/w voice terminations XXXX Yes XXXX No
Manufacturer and type
Central office voice terminations Equipped XXXX, Wired Only XXXX
        7.1.3.2 Digital span line (DS1) supplied by
XXXXOwner
XXXXBidder
Manufacturer and Type
        7.1.3.3 Number of repeaters (per span line) XXXX
        7.1.3.4 Diverse (alternate) span line routing required
XXXXYes (Describe in Item 11) XXXXNo
        7.1.3.5 Span line terminations only XXXXYes XXXXNo
        7.1.3.6 Span line power required (CO and Remote Terminals) XXXXYes XXXXNo
        7.1.3.7 Physical facility between CO and remote Loop Resistance XXXXohms, Length XXXXmeters
8. Power Equipment Requirements
        8.1 Central Office Terminal
        8.1.1 Owner-furnished 48 volt dc power XXXXYes XXXXNo
        8.1.2 Other (Describe)
_
        8.1.3 Standby power is available XXXXYes XXXXNo
        8.2 Remote Terminal
        8.2.1 Owner-furnished 48 vdc power XXXXYes XXXXNo
        8.2.2 Bidder-furnished power supply XXXXYes XXXXNo
        8.2.3 AC power available at site:
XXXX110 vac, 60 Hz, single-phase
XXXXOther (Describe in Item 11)
        8.2.4 A battery reserve of XXXX busy hours shall be provided for this line concentrator terminal when it reaches XXXX lines at the traffic rates specified.
        8.2.5 Batteries supplied shall be:
XXXXLead Calcium
XXXXStabilized Electrolyte
XXXXSealed Lead Acid
XXXXOther (Describe in item 11)
        8.2.6 Standby power is available XXXXYes XXXXNo
9. Remote Terminal
        9.1 Mounting
        9.1.1 XXXXOutside Housing (To be furnished by bidder)
        9.1.2 XXXXConcrete Slab to be furnished by owner (Bidder to supply construction details after award.)
        9.1.3 XXXXManhole, environmentally controlled (Describe in Item 11)
        9.1.4 XXXXPedestal Mounting
        9.1.5 XXXXPole Mounting (Owner-furnished installed pole)
        9.1.6 XXXXPrefab Building (Owner-furnished site)
        9.2 Equipment is to be installed in an existing building.
XXXXYes XXXXNo
(Attach detailed plan.)
        9.3 Other (Describe)
_
_
10. Alternates
11. Explanatory Notes
Appendix B to _1755.397 -- Specification for Line Concentrators Detailed Requirements; Bidder Supplied Information
Telephone Company (Owner)
Name:
Location:
Line Concentrator Equipment Locations
Central Office Terminal:
Remote Terminal:
1. General
        1.1 The equipment and materials furnished by the bidder must meet the requirements of paragraphs (a) through (p) of this section.
        1.2 Paragraph (a) through (p) of this section cover the minimum general requirements for line concentrator equipment.
        1.3 Paragraph (q) of this section covers requirements for installation, inspection and testing when such service is included as part of the contract.
        1.4 Appendix A of this section covers the technical data for application engineering and detailed equipment requirements insofar as they can be established by the owner. Appendix A of this section is to be filled in by the owner.
        1.5 This appendix B covers detailed information on the line concentrator equipment, information as to system reliability and traffic capacity as proposed by the bidder. This appendix B shall be filled in by the bidder and must be presented with the bid.
2. Performance Objectives
        2.1 Reliability (See paragraph (c) of this section)
_
_
_
_
        2.2 Busy Hour Load Capacity and Traffic Delay (See Paragraph (g) of this section)
_
_
_
3. Equipment Quantities Dependent on System Design
        3.1 Transmission Facilities between the Central Office and Remote
(TABLE START)Terminals
@h1Type
@h1Quantity equipped
@h1Quantity wired only
  ....   ....
  ....   ....
  ....   ....
(TABLE END)
4. Power Requirements
4.1 Central Office Terminal
Voltage
Current Drain (Amps) Normal XXXX, Peak XXXX
Fuse Qty XXXX, Size XXXX, Type XXXX
Heat Dissipation (BTU/Hr.) XXXX
_
4.2 Remote Terminal
AC or DC
Voltage
Current Drain (Amps) Normal XXXX, Peak XXXX
Fuse Qty XXXX, Size XXXX, Type XXXX
Heat Dissipation (BTU/Hr.) XXXX
_
        Power required for heating or cooling equipment in remote bidder-furnished housing
_
_
5. Temperature and Humidity Limitations
(TABLE START)
5.1 Temperature
@h1
@h1Central office
@h1Remote*
Maximum _F (_C)  ....   ....
Minimum _F (_C)  ....   ....
(TABLE END)
(TABLE START)
5.2 Relative Humidity
@h1
@h1Central office
@h1Remote*
Maximum  ....   ....
Minimum  ....   ....
Footnote: *Show conditions outside bidder-furnished housing.
(TABLE END)
6. Explanatory Notes
[60 FR 44729, Aug. 29, 1995]
__1755.398 -- 1755.521 [Reserved]
_1755.522   RUS general specification for digital, stored program controlled central office equipment.
        (a) General. (1) This section covers general requirements for a digital telephone central office switching system, which is fully electronic and controlled by stored program processors. A digital switching system transfers information which is digitally encoded from any input port to a temporarily addressed exit port. The information may enter the system in either analog or digital form and may or may not be converted to analog at the exit port depending on the facility beyond. The switching system shall operate properly as an integral part of the telephone network when connected to physical and carrier derived circuits meeting RUS specifications and other generally accepted telecommunications practices.
        (2) The output of a digital-to-digital port shall be Pulse Code Modulation (PCM), encoded in eight-bit words using the mu-255 encoding law and D3 encoding format, and arranged to interface with a T1 span line.
        (3) American National Standards Institute (ANSI) Standard S1.4 - 1983, Specification for Sound Level Meters, is incorporated by reference by RUS. This includes S1.4A-1985 that is also incorporated by reference. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from ANSI Inc., 11 West 42nd Street, 13th Floor, New York, NY 10036, telephone 212 - 642 - 4900. Copies may be inspected during normal business hours at RUS, room 2838-S, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
        (4) American Society for Testing Materials (ASTM) Specification B 33 - 91, Standard Specification for Tinned Soft or Annealed Copper Wire for Electrical Purposes, is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from ASTM, 1916 Race Street, Philadelphia, PA, telephone 215 - 299 - 5400. Copies may be inspected during normal business hours at RUS, room 2838-S, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
        (5) Bell Communications Research (Bellcore) document SR-TSV-002275, BOC Notes on the LEC Networks -- 1990, March 1991, is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Bellcore Customer Service, 60 New England Avenue, Piscataway, NJ 08854, telephone 1 - 800 - 521 - 2673. Copies may be inspected during normal business hours at RUS, room 2838-S, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
        (6) Bellcore TR-TSY-000508, Automatic Message Accounting, July 1987, is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Bellcore Customer Service, 60 New England Avenue, Piscataway, NJ 08854, telephone 1 - 800 - 521 - 2673. Copies may be inspected during normal business hours at RUS, room 2838-S, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
        (7) Federal Standard H28, Screw-Thread Standards for Federal Services, March 31, 1978, is incorporated by reference by RUS. This includes: Change Notice 1, Federal Standard, Screw-Thread Standards for Federal Services, May 28, 1986; Change Notice 2, Federal Standard, Screw-Thread Standards for Federal Services, January 20, 1989; and Change Notice 3, Federal Standard, Screw-Thread Standards for Federal Services, March 12, 1990. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from the General Services Administration, Specification Section, 490 East L'Enfant Plaza SW, Washington, DC 20407, telephone 202 - 755 - 0325. Copies may be inspected during normal business hours at RUS, room 2838-S, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
        (8) Institute of Electrical and Electronics Engineers (IEEE) Std 455 - 1985, IEEE Standard Test Procedure for Measuring Longitudinal Balance of Telephone Equipment Operating in the Voice Band, is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from IEEE Service Center, 445 Hoes Lane, P. O. Box 1331, Piscataway, NJ 08854, telephone (201) 981 - 0060. Copies may be inspected during normal business hours at RUS, room 2838-S, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
        (9) Institute of Electrical and Electronics Engineers (IEEE) Std 730 - 1989, IEEE Standard for Software Quality Assurance Plans, is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from IEEE Service Center, 445 Hoes Lane, P. O. Box 1331, Piscataway, NJ 08854, telephone (201) 981 - 0060. Copies may be inspected during normal business hours at RUS, room 2838-S, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
        (10) RUS Bulletin 345 - 50, PE-60, RUS Specification for Trunk Carrier Systems, September 1979, is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552 (a) and 1 CFR part 51. Copies may be obtained from the Rural Utilities Service, Administrative Services Division, room 0175-S, Washington, DC 20250. The bulletin may be inspected at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
        (11) RUS Bulletin 345 - 55, PE-61, Central Office Loop Extenders and Loop Extender Voice Frequency Repeater Combinations, December 1973, is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552 (a) and 1 CFR part 51. Copies may be obtained from the Rural Utilities Service, Administrative Services Division, room 0175-S, Washington, DC 20250. The bulletin may be inspected at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
        (12) RUS Bulletin 345 - 87, PE-87, RUS Specification for Terminating (TIP) Cable, December 1983, is incorporated by reference RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552 (a) and 1 CFR part 51. Copies may be obtained from the Rural Utilities Service, Administrative Services Division, room 0175-S, Washington, DC 20250. The bulletin may be inspected at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
        (b) Reliability. (1) Quality control and burn-in procedures shall be sufficient so the failure rate of printed circuit boards does not exceed an average of 1.0 percent per month of all equipped cards in the central office during the first three months after cutover, and an average of 0.5 percent per month of all equipped cards in the central office during any 6-month period thereafter. A failure is considered to be the failure of a component on the PC board which requires it to be repaired or replaced.
        (2) The central office switching system shall be designed such that the expected individual line downtime does not exceed 30 minutes per year. This is the interval that the customer is out of service as a result of all failure types, excluding dispatch and travel time, i.e., hardware, software, and procedural errors.
        (3) The central office switching system shall be designed such that there will be no more than 1 hour of total outages in 20 years, excluding dispatch and travel time for unattended offices.
        (c) System type acceptance tests. (1) System type acceptance tests (general acceptance tests) are performed for the purpose of determining whether or not a type of switching system should be added or retained as an RUS accepted system. While general acceptance tests will be required on each system type, they will not be expected to cover every requirement in this section. However, any installation of a system provided in accordance with this section shall be capable of meeting any requirement in this section on a spot-check basis.
        (2) A ``completed call'' test shall be made part of these system type acceptance tests. There shall be no more than two in 10,000 locally originating and incoming calls misdirected, unsuccessfully terminated, prematurely disconnected or otherwise failing as a result of equipment malfunction and/or equipment failures, or as a result of transients, noise or design deficiencies. This test shall be made with a load box with no less than 10 lines access and 10 subscriber numbers for completion, or equivalent, with no other traffic in the system. If there is a failure in the equipment during this test, the cause shall be repaired and the test restarted at zero calls.
        (3) System type acceptance testing applies basically to factory type testing, and not to owner acceptance testing for individual installations. The overall installed and operating system shall also meet these requirements, except for unusual circumstances or where specifically excluded by this or other RUS requirements.
        (d) Types of requirements. (1) Unless otherwise indicated, the requirements listed in this section are fixed requirements.
        (2) Optional requirements are those which may not be needed for every office and are identifiable by a phrase such as, ``when specified by the owner,'' or, ``as specified by the owner.''
        (3) In some cases where an optional feature specified in paragraph (e) of this section will not be required by an owner, either now or in the future, a system which does not provide this feature will be considered to be in compliance with this section for the specific installation under consideration, but not in compliance with the entire section.
        (4) The owner may request bids from any RUS accepted supplier whose system provides all the features which will be required for a specific installation.
        (5) The Application Guide, RUS TE&CM 322, provides information about the economic and service factors involved in all optional features, as well as instructions for the completion of appendices A and B of this section.
        (e) General requirements. (1) The equipment shall provide for terminating and automatically interconnecting subscriber lines and trunks in response to dial pulses (or pushbutton dialing signals, if specified) without the aid of an operator.
        (2) Complete flexibility shall be provided for assigning any subscriber directory number to any central office line equipment by the use of internal programmed memory. Thus, any subscriber line and/or directory number may be moved to another terminal to distribute traffic loads, if the line equipment hardware is compatible with the service provided.
        (3) The system shall be arranged to interface with interexchange carrier trunks and networks using single digit or multi-digit access codes. The system shall be equipped to handle at least 20-digit subscriber dialed numbers. All subscriber directory numbers in the office shall be seven-digit numbers.
        (4) The network and the control equipment shall be comprised of solid-state and integrated circuitry components. Peripheral equipment shall be comprised of solid-state and integrated circuitry components as far as practical and consistent with the state-of-the-art and economics of the subject system.
        (5) The basic switching system shall include the provision of software programming and necessary hardware, including memory, for optional custom calling services such as call waiting, call forwarding, three-way calling, and abbreviated dialing. It shall be possible to provide these services to any individual line (single-party) subscriber. The addition of these services shall not reduce the anticipated ultimate engineered line, trunk, and traffic capacity of the switching system as specified in appendix A of this section.
        (6) The requirements in this specification apply only to single party lines. Although only single frequency ringing is required, other types may be requested in appendix A of this section.
        (7) Provision shall be made for local automatic message accounting (LAMA), and for traffic service position system (TSPS) trunks, or equivalent, to the operator's office when required either initially or in the future.
        (8) Tandem switching features shall be provided if specified in appendix A of this section.
        (9) The system shall be arranged to serve a minimum of eight All Number Calling (ANC) office codes per office, with discrimination on terminating calls by trunk group, numbering plan, or programmed memory and class mark, if specified in appendix A of this section.
        (10) Busy hour load handling capacity is an important feature when an office approaches capacity. The delays which may occur in call completion during busy hour periods may prove to be excessive in some system designs. Accordingly, each bidder shall provide, in appendix C of this section, data satisfactory to RUS regarding the busy hour load handling capacity and traffic delays of the system.
        (11) Provision shall be made for hotel-motel arrangements, as required by the owner, to permit the operation of message registers at the subscriber's premises to record local outdial calls by guests (see Item 10.5, appendix A of this section).
        (12) Provision shall be made to identify the calling line or incoming trunk on nuisance calls (see paragraph (g)(10) of this section for details).
        (13) Full access from every subscriber line to every interoffice trunk shall be provided.
        (14) Facilities shall be provided to implement service orders, make traffic studies, and perform switching and transmission tests by means of remote control devices if such operations are specified in Items 11.2 and 11.3 of appendix A of this section.
        (15) Provision shall be made for the addition of facilities to record all subscriber originated calls based on dialed directory number, time of day, and duration of conversation. They shall be such that the additional equipment (if any is required) may be added to an in-service system without interruption of service and a minimum of equipment, wiring and software modifications.
        (16) The system shall be capable of distributed switching operation where groups of subscriber lines can be remotely located from the central office. The remotely situated units are known as ``Remote Switching Terminals'' (RST's) (see paragraph (w) of this section). This does not eliminate the use of pair gain devices such as direct digitally connected concentrators, regular concentrators or subscriber carrier equipment, where specifically ordered by the owner and its engineer.
        (17) The switching system shall have means to synchronize its clock with switches above it in the network hierarchy, when specified by the owner in item 3, appendix A of this section (see paragraph (j) of this section).
        (18) Consistent with system arrangements and ease of maintenance, space shall be provided on the floor plan for an orderly layout of future equipment bays that will be required for anticipated traffic when the office reaches its ultimate size. Readily accessible terminals shall be provided for connection to interbay and frame cables to future bays. All cables, interbay and intrabay (excluding power), if technically feasible, shall be terminated at both ends by use of connectors.
        (19) When specified in appendix A of this section, the system shall be capable of processing emergency calls to a 911 service bureau connected either by a group of one-way 911 lines or a trunk group.
        (i) It shall be possible to reach the service bureau by dialing 911, 1+911, or a 7-digit number.
        (ii) The system shall select an idle 911 line or trunk.
        (iii) The system shall provide usual ringing and ringback signal until the called 911 line answers.
        (iv) If the calling line goes on-hook first, the system shall hold the connection from the called 911 line and return steady low tone to the service bureau. The system shall then begin a 45-minute timeout, after which the calling line is disconnected and an alarm message is printed on a TTY. If the calling line goes off-hook before timeout, the system shall reestablish the conversation path.
        (v) If the calling line does not disconnect, the service bureau attendant shall have the ability to force a disconnect of the established connection with the calling party.
        (vi) When the 911 call is answered, the equipment shall be arranged so that coin lines are not charged for the call. Similarly, if some form of local call charging is used, there shall be no charge for the 911 call.
        (vii) If the 911 service bureau is holding a calling line, it shall be possible for the 911 line to cause the equipment to ring back the calling line. This is done by providing a flash of on-hook signal from the 911 line lasting from 200 to 1,100 milliseconds. The signal to the calling line shall be ringing current if the line is on-hook, or receiver off-hook (ROH) tone if the line is off-hook.
        (viii) Calls shall not be originated from the service bureau via the dedicated 911 lines. If an attempt is made to originate a call, it shall receive reorder tone. After 6 minutes, the system shall print an alarm message.
        (ix) If 911 calls pass through intermediate switching, the forced-hold control, emergency ringback, and calling line status monitoring capabilities are lost.
        (f) Line circuit requirements -- (1) General. (i) The range of direct current (dc) resistances of subscriber loops, measured from the main frame in the central office and including the telephone set shall be at least 0 - 1900 ohms without loop extension and 1900 - 3600 ohms with loop extenders, or equivalent. The range when using extension equipment may be significantly reduced for straight line ringers. These limits apply under maximum adverse environmental and manufacturing variation tolerance conditions. Central office voltage shall be stabilized at a value necessary to provide at least a nominal 21 milliamperes current with a nontreated loop of at least 1900 ohms. Minimum loop insulation resistance without loop extenders shall be 25,000 ohms between conductors or from either conductor or both conductors in parallel to ground. Loop insulation resistance for loop extension devices may be 100,000 ohms minimum between conductors or from either conductor or both conductors in parallel to ground.
        (ii) Subscribers on the same party line shall have the ability to call each other. Requirements for revertive call operation are provided in paragraph (g)(8) of this section.
        (iii) In addition to operating on nonloaded cable pairs and subscriber carrier, the equipment shall function properly with D-66 and H-88 loaded cable pairs, including any provisions the equipment must control for the purposes of proper transmission.
        (2) Dialing -- (i) Subscriber dial speed. The line equipment and central office equipment (COE) in tandem shall operate satisfactorily when used with subscriber dials having a speed of operation between eight and twelve impulses per second and a break period of 55 to 65 percent of the total impulse period.
        (ii) Subscriber dial interdigital time. The line equipment and central office equipment shall operate satisfactorily with subscriber rotary dial interdigital times of 200 milliseconds minimum, and with pushbutton dialing interdigital times of 50 milliseconds minimum.
        (iii) Subscriber line pushbutton dialing frequencies. (A) The frequency pairs assigned for pushbutton dialing shall be as follows, with
(TABLE START)an allowable variation of 1B 1.5 percent:
@h1Low Group Frequencies (Hz)
@h1High Group Frequencies (Hz)@h21209@h21336@h21477@h21633
697  .... 1  .... 2  .... 3  .... Spare
770  .... 4  .... 5  .... 6  .... Spare
852  .... 7  .... 8  .... 9  .... Spare
941  .... *  .... 0  .... 1B  .... Spare
(TABLE END)
        (B) The receiver shall comply with the operating parameters of the dual-tone multifrequency (DTMF) central office receiver as described in section 6 of Bell Communications Research (Bellcore) document SR-TSV-002275, BOC Notes on the LEC Networks -- 1990.
        (3) Impedance. For the purpose of this section, the input impedance of all subscriber loops served by the equipment is arbitrarily considered to be 900 ohms at voice frequencies.
        (4) Lockout. (i) All line circuits shall be arranged for line lockout. When a permanent condition occurs prior to placing a line into lockout, a timed low level warning followed by a timed high level receiver off-hook (ROH) tone (see paragraph (i)(2)(xi) of this section) or a howler circuit (see paragraph (o)(2)(iii)(C) of this section) shall be applied to the line.
        (ii) The line on lockout shall be reconnected automatically to the central office when the permanent off-hook condition is cleared.
        (5) Pay stations. Pay stations may be prepay, or semi-postpay, as specified by the owner.
        (6) Loop extension. (i) The number of lines which exceed 1900 ohms will be specified by the owner. When requested by the owner, the bidder shall furnish equipment to guarantee satisfactory operation of all lines.
        (ii) Working limits for subscriber lines with loop extenders are covered in RUS Bulletin 345 - 55, PE-61, Central Office Loop Extenders and Loop Extender Voice Frequency Repeater Combinations.
        (iii) Ringing from RUS accepted loop extenders, or their equivalent, shall be cut off from the called line when the handset at the called station is removed during the ringing or the silent interval.
        (7) Private branch exchange (PBX) lines. PBX trunk hunting shall be available. It will not be necessary to segregate PBX lines to certain line groups.
        (8) Quantity. A sufficient number of terminations shall be provided, in addition to the quantity specified by the owner for subscriber line service, to meet the requirements of the system for equipment testing, alarm checking, tone transfer, loop around test and other features.
        (9) Types. There shall be provisions for types of lines such as ground start, loop start, regular subscriber, pay stations, etc.
        (g) Intraoffice switching requirements. (1) The switching system shall:
        (i) Provide dial tone in response to origination of a call by a subscriber, except on special lines where the application of dial tone is not applicable, such as manual and hot lines;
        (ii) Remove dial tone immediately after the first digit has been dialed;
        (iii) Recognize the class of service of the calling subscriber;
        (iv) Register the digits dialed by the calling subscriber where the rotary dial or pushbutton dialing characteristics and the minimum interdigital times are as specified;
        (v) Perform the necessary translation functions when the required number of digits have been registered, and select a channel to a proper outgoing trunk, if one is available, to the designated interexchange carrier;
        (vi) Provide a transmission path from the calling subscriber line to the selected trunk, if an idle one is found;
        (vii) Provide for more than one alternate route to the desired destination when specified by the owner, select an idle outgoing trunk in the first or second choice alternate route trunk group, if all trunks in the higher choice groups are busy, and provide a reorder signal (see paragraph (i)(2)(iv) of this section) to the subscriber if no trunks are available in the last choice alternate route;
        (viii) Translate the proper part of the registered incoming routing data on tandem calls into an identification of an outgoing trunk group, select an idle trunk in that group, initiate the connection of the incoming trunk to the outgoing trunk, set the trunks in the proper configuration for tandem operation, and transmit information as required to permit completion to the desired destination in the distant office;
        (ix) Transmit the proper stored information over the selected trunk to permit completion of outgoing calls to the desired destination by the distant office or offices, and provide multifrequency (MF) outpulsing when specified;
        (x) Register all the digital information on calls incoming from a distant office, when dial or MF pulsing characteristics and interdigital times are as specified;
        (xi) Translate internally a registered directory number into line equipment location, ringing code and terminating class (such as ``PBX hunting'') on incoming or intraoffice calls;
        (xii) Test the called line for a busy condition;
        (xiii) Connect the incoming trunk or locally originated call to the called line if the called line is idle;
        (xiv) Permit any type of ringing voltage available in the central office to be associated with any Subscriber Directory Number (SDN), cause the proper type of ringing voltage to be connected to the called line, and remove ringing from the line upon answer whether in the ringing or silent period; and
        (xv) Test and monitor the switching system continually during periods of low traffic using the maintenance and diagnostic subsystem.
        (2) The switching system shall offer at least the following originating and terminating class-of-service indications on a per-line basis to subscribers, as specified by the owner:
        (i) Flat rate individual line, bridged ringing;
        (ii) Flat rate two-party, full selective ringing;
        (iii) Flat rate four-party, full selective ringing;
        (iv) Flat rate PBX and trunk hunting numbers, bridged ringing;
        (v) Pay station;
        (vi) Message rate subscriber line;
        (vii) Wide Area Telephone Service (WATS);
        (viii) Extended Area Service (EAS);
        (ix) Data service;
        (x) Hotel-Motel capability;
        (xi) Denied originating;
        (xii) Denied terminating;
        (xiii) Custom calling features;
        (xiv) Special interexchange carrier accesses; and
        (xv) Presubscription to designated interexchange carrier.
        (3) The switching system shall provide PBX hunting.
        (i) At least one trunk hunting group in each 100 SDN's equipped shall be provided. More may be provided as specified by the owner.
        (ii) PBX groups shall be of a reasonable size commensurate with the ultimate size of the switching system.
        (iii) Any available SDN may be used for PBX trunk hunting.
        (iv) Each PBX group shall have the capability of being assigned one or more nonhunting SDN's for night service.
        (v) If the called line is a PBX hunting line, the switching system shall test all assigned lines in the hunting group for a busy condition.
        (vi) If the called PBX group is busy, line busy tone, as specified in paragraph (i)(2)(iii) of this section, shall be returned to the originating end of the connection.
        (4) The switching system shall provide pay stations which may be prepay or semi-postpay. The system shall be arranged so that an operator and emergency service (911) may be reached from prepay or semi-postpay coin lines without the use of a coin, when the proper pay station equipment is provided.
        (5) To meet dialing requirements, the switching system shall:
        (i) Initiate the line lockout function after a delay, as specified in paragraph (r)(3) of this section, if dial or pushbutton dialing pulses are not received after initiation of a call, preferably routing the subscriber line to a holding circuit for tones and then automatically to lockout;
        (ii) Connect 120 interruptions per minute (IPM) paths busy tone, recorded message, or other distinctive tone to the calling subscriber if an interval longer than that specified in paragraph (r)(4) of this section elapses between dialed digits;
        (iii) Register the standard tone calling signals received from a subscriber station arranged for pushbutton dialing if specified by the owner, provide arrangements to function properly with 12-button pushbutton dialing sets, and return a reorder signal to the subscriber upon receipt of signal from the 11th or 12th buttons if neither of these buttons is assigned functions; and
        (iv) Connect the incoming trunk to the digit register equipment within 120 milliseconds after seizure where direct dialing is received on calls from a distant office, cancel the bid for a register, and return reorder tone to the calling end if dial pulses are received before a register is attached.
        (6) The switching system shall provide for appropriate circuit usage.
        (i) To avoid inefficient utilization of the switching network, that portion of the common equipment that establishes the connection on intramachine calls shall not require more than 500 milliseconds, exclusive of ringing and ring trip, to complete its function under no-delay conditions.
        (ii) The switching system shall provide for duplication in a load sharing or redundant configuration any circuit elements or components, the failure of which would reduce the grade of service of 100 or more lines by more than 25 percent of the traffic carrying capacity.
        (iii) The switching system shall ensure that failure of access to a high choice circuit will not prevent subsequent calls from being served by lower choice circuits, wherever possible.
        (iv) Where only two circuits of a type are provided, circuits shall be designed so that failure of one circuit will not permanently block any portion of the system for the duration of the failure.
        (v) Where more than two circuits of a type are provided, successive usages should be on a rotational or random basis rather than the step-up selection with the possible exception of a last choice trunk.
        (vi) The system shall be designed so that, in the event of a network failure, the system shall immediately or simultaneously use a redundant portion of the network to complete the call.
        (7) The switching system shall provide busy verification facilities with the method of access specified by the owner.
        (i) Only an operator or a switchman shall be able to override a busy line condition.
        (ii) If the called line is busy, off-hook supervision shall be given the operator or switchman.
        (iii) The responsibility of restricting subscribers in distant offices from having access to busy verification shall be on the distant office personnel when the toll trunks are used for both toll connecting and verification traffic.
        (iv) When a verification code is used, all digits of the code must be dialed before cut-through to the called line can be accomplished.
        (8) The switching system shall provide revertive call by directory number to permit subscribers on the same party line to call each other.
        (i) A ``don't answer'' disconnect feature shall be provided, which shall operate after an elapsed timing interval as specified in paragraph (r)(6) of this section.
        (ii) The equipment shall be designed to provide a recorded announcement to the calling party when they dial a party on the same line and provide an announcement or a distinctive tone as specified by the owner, in appendix A of this section, to the called party when the called party answers.
        (9) The switching system shall provide intercept facilities.
        (i) All unused numbering plan area codes, home numbering plan area office codes, service codes and subscriber directory numbers (SDN's) shall be routed to intercept. All intercept administration shall be by changes in memory administrable by telephone company personnel. Maximum machine time to place a subscriber on intercept shall be 15 seconds.
        (ii) Unequipped SDN's intercept shall be effective if the processor memory does not have information concerning the SDN in question.
        (iii) The intercept equipment shall be arranged so that specific SDN's can be routed to a separate intercept circuit for changed numbers.
        (iv) When an intercept call is answered, either by an operator or by a recorded announcement, an off-hook or charge supervision signal shall not be returned, even momentarily, to the originating end.
        (v) When intercepting service is to be handled over the regular interoffice toll trunks, a distinctive identifying tone shall be transmitted when the operator answers. This tone shall be of the frequency and duration specified in paragraph (i)(2)(x) of this section.
        (10) The switching system shall provide nuisance call trap facilities which, when activated, provide a permanent record of the calling and called numbers complete with date and time of day. Where the call originates over an interoffice trunk, the actual trunk number shall be recorded. There shall be provision for the called subscriber to hold the connection and for the positive trace of the call from origination to termination within the office.
        (11) The switching system shall follow appropriate release procedures.
        (i) The office shall be arranged so a connection to a terminating channel other than assistance operator shall be released under control of the calling party so that the channel can be reseized, unless the call is to emergency 911 service or other termination arranged for called party control.
        (ii) If the called party disconnects first, the channel used in the originally established connection shall be held until the calling party disconnects or until the timing interval specified in paragraph (r)(7) of this section has elapsed. This feature shall not interfere with the normal operation of calls to intercept, fire alarm, or other special services.
        (12) The switching system shall provide line load control facilities, when specified by the owner, to give preference for originating service to a limited group of subscribers during emergencies.
        (i) These facilities may be activated manually by input-output (I/O) device or automatically after a manual setting of a key (or equivalent) to put line load control into effect, as determined by the bidder. The automatic procedure is preferable.
        (ii) Procedures shall be established to avoid the unauthorized use of the line load control facilities.
        (iii) Where automatic activation is provided, service may be provided to small groups of nonemergency subscribers on limited grade of service whenever the office load becomes low enough to permit this to be done safely.
        (h) Interoffice trunk circuit requirements -- (1) General. (i) The bidder shall supply, as requested by the owner, solid-state technology type trunk and signaling circuits of any of the types described in RUS TE&CM 319, Interoffice Trunking and Signaling, or, with the approval of RUS, any other more recent and desirable types not as yet covered in the manual. For dc signaling, the duplex (DX) and loop types of signaling are preferred.
        (ii) Trunks shall not be directly driven from the subscriber's dial on outward calls.
        (iii) In order to reduce the spares inventory and minimize incidence of improper maintenance replacement of circuit assemblies, the types of trunk circuits shall be kept to a minimum. Variation in assemblies should be mainly limited to variation in signaling modes.
        (iv) Trunk circuits which connect with carrier or 4-wire transmission facilities shall be arranged for 4-wire transmission to avoid an intermediate 2-wire interface between a 4-wire switching system and trunk facilities.
        (2) Quantity. Trunk quantities shall be as specified in appendix A of this section. Sufficient space shall be provided for an orderly layout of trunks. Trunks of a certain type going to the same destination may be grouped together on the original installation.
        (3) Requirements for interoffice connections. (i) When operator trunks are used in common for both coin and noncoin lines, they shall be arranged to provide an indication to the operator by means of a visual signal or tone when calls are from pay stations. When a tone is used, it shall be of the type specified in paragraph (i)(2)(v) of this section and shall be connected to be heard only by the operator upon answer. It shall be possible to repeat the tone signal.
        (ii) There are no requirements for trunks arranged for manual re-ring by a toll operator, either with the receiver on or off the hook, except to coin stations with the receiver on the hook.
        (iii) On calls from subscribers to the assistance operator, the release of the connection shall be under control of the last party to disconnect. An exception is operator control of disconnect that is used on outgoing trunks to a TSP/TSPS system.
        (iv) On calls originated by an operator, the release of the connection shall be under control of the operator.
        (v) Where trunks with E and M lead signaling are used, the trunk circuits for Type I signaling shall be arranged to place ground on the M lead during the on-hook condition and battery on the M lead in the off-hook condition. For E and M Type II, only a make contact between the MA and MB lead will be required. In either type, current limiting shall be provided in the E lead of the trunk circuit itself, as required for proper operation. It shall be assumed that connection equipment in the form of trunk carrier, multiplex, or associated signaling apparatus furnishes only a contact closure to ground (Type I) or to a signal ground lead (Type II) for an off-hook condition on the E lead.
        (vi) Where answer supervision is used to determine the initiation of the charging interval for a call, such answer supervision shall not be effective for charging until after the elapse of the timing interval listed in paragraph (r)(5) of this section.
        (vii) When necessary, provision shall be made for reception of start and stop dial signals on toll trunk equipment.
        (viii) When trunks arranged for automatic message accounting (AMA), toll ticketing, or centralized automatic message accounting (CAMA) are specified by the owner, these trunks shall provide the pertinent features described in paragraph (k) of this section applicable to such functions.
        (4) Requirements for direct digital connections. (i) Interface units which will permit direct digital connection to other digital switches, channel banks and remote line and/or trunk circuits over digital facilities shall be provided when specified by the owner. The digital transmission system shall be compatible with T1 type span lines using a DS1 interface and other digital interfaces that may be specified by the owner. The RUS specification for the span line equipment is Bulletin 345 - 50, PE-60, RUS Specification for Trunk Carrier Systems.
        (ii) Each interface circuit shall connect 24 voice channels to the switching system from a 1.544 megabit per second DS1 bit stream. The DS1 bit stream entering or exiting the system shall be in the D3 format and the voice signals shall be encoded in 8 bit mu-255 PCM. The format and processing of the bit stream must be compatible with characteristics of the D3 channel bank such as alarm and maintenance characteristics. Loss of receive signal (DS1) shall be detected and the equivalent of a carrier group alarm shall be executed in 2.5 1B 0.5 seconds. Loss of synchronization shall be detected by slips, timing jitter, and wander in accordance with industry standards.
        (iii) Signaling shall be by means of MF or dial pulse (DP) and the system which is inherent in the A and B bits of the D3 format. In the case where they are not used for signaling, the A and B bits shall be used only for normal voice and data transmission.
        (i) Tone requirements -- (1) General. Tones shall be provided to indicate the progress of a call through the office. Tone generators should be an integral part of the switching systems. The tones should be introduced digitally by the application of the appropriate bit stream to the line or trunk circuit via the digital switching network. The necessary precautions shall be made to ensure tone sources automatically if the primary sources fail.
        (2) Tone specifications. (i) Dial tone shall consist of 350 Hz plus 440 Hz at a composite level of 10 dBm0 which equates to 13 dBm0 per frequency. This is the precise tone suitable for use with pushbutton dialing.
        (ii) Low tone shall consist of 480 Hz plus 620 Hz at a composite level of 21 dBm0 which equates to 24 dBm0 per frequency.
        (iii) Line busy tone shall be low tone interrupted at 60 IPM, with tone on 0.5 seconds and off 0.5 seconds.
        (iv) Reorder, all paths busy, and no circuit tone shall be low tone interrupted at 120 IPM, with tone on 0.25 seconds and off 0.25 seconds.
        (v) Identifying tone on calls from coin lines shall be uninterrupted low tone.
        (vi) High tone shall consist of 480 Hz at 17 dBm0.
        (vii) Audible ringback tone shall consist of 440 plus 480 Hz at a composite level of 16 dBm0 which equates to 19 dBm0 per frequency.
        (viii) The call progress tones listed in this section are described in Bellcore document SR-TSV-002275, BOC Notes on the LEC Networks -- 1990, section 6. The 350, 440, 480, and 620 Hz tones shall be held at 1B 0.5 percent frequency tolerance and 1B 3 dB amplitude variation. The amplitude levels specified are to be measured at the main distributing frame, excluding cable loss.
        (ix) Distinctive tone, when required for alarm calls, or other features, shall consist of high tone interrupted at 200 IPM with tone on 150 ms and off 150 ms.
        (x) Identifying tone on intercepted calls shall consist of uninterrupted high tone impressed on the trunk circuit 300 to 600 milliseconds following the operator's answer of intercepted calls.
        (xi) An ROH circuit shall have output tones which do not interfere with the pushbutton or multifrequency signaling tones. The ROH tone may be introduced digitally internal to the system near the overload level of +3 dBm0. No power adjustment will be required. The frequency of the output shall be distinctive and urgent in order to attract the subscriber's attention to an off-hook situation. (Warning: In order to determine the signal level, a frequency selective voltmeter must be used to determine the level of each signal component and mathematical power addition used to combine these measurements into a single level value.)
        (xii) During application of tones, office longitudinal balance shall be maintained within 15 dB of that specified in paragraph (q)(8) of this section.
        (j) System clock. (1) The central office clock and network synchronization system shall have the ability to be synchronized with external clocks for network synchronization, including detection of slips, timing, jitter and wander, in a digital-to-digital environment or operate initially in an independent network (refer to Bellcore document SR-TSV-002275, BOC Notes on the LEC Networks -- 1990, section 11).
        (2) The end office central office system clock shall be a Stratum 3 clock with:
        (i) A minimum long-term accuracy of 1B4.6 0A 106 (1B7 Hz @ 1.544 MHz);
        (ii) A minimum stability of 3.7 0A 107/day upon loss of all frequency references; and
        (iii) A ``Pull-In Range'' for the capability of synchronizing to a clock with accuracy of 1B4.6 0A 10 6.
        (3) The access tandem central office system clock shall be a Stratum 2 clock with:
        (i) A minimum long-term accuracy of 1B1.6 0A 108 (1B0.025 Hz @ 1.544 MHz);
        (ii) A minimum stability of 1 0A 1010/day upon loss of all frequency references; and
        (iii) A ``Pull-In Range'' for the capability of synchronization to a clock with accuracy of 1B1.6 0A 108.
        (k) Switched access service arrangements -- (1) General. The equipment shall be capable of providing Feature Group A, Feature Group B, Feature Group C, and Feature Group D switched access service arrangements, as described in Bellcore document SR-TSV-002275, BOC Notes on the LEC Networks -- 1990, section 6 and section 15, including arrangements for automatic number identification (ANI).
        (2) Operation. (i) All equipment shall be arranged for Feature Group A (Line Side Connection).
        (ii) All equipment shall be arranged for Feature Group B given that appendix A of this section requires the equipment of the necessary trunks (Trunk Side Connection).
        (iii) The equipment shall be arranged for Feature Group C on the trunk groups specified in appendix A of this section. Even though appendix A of this section specifies Feature Group D or some other trunk group, it shall be possible through software commands available to the owner to use Feature Group C signaling protocols on a trunk group basis until such time that the trunk group in question converts to Feature Group D signaling protocols.
        (iv) The equipment shall be arranged for Feature Group D on the trunk groups specified in appendix A of this section.
        (v) Calls originating from coin lines toward switched access service shall be arranged either to provide signaling protocols for TSPS, or in the absence of TSPS-type service, such calls shall be blocked.
        (vi) The equipment shall be arranged for forwarding routing information, calling party identification, and called party numbers in the proper feature group protocols, by trunk group as specified in appendix A of this section.
        (vii) The equipment shall be arranged for AMA data collection as specified in appendix A of this section by trunk group. Unless otherwise specified by the owner, the equipment shall be arranged to collect the billing data in the Bellcore AMA format as described in Bellcore document TR-TSY-000508, Automatic Message Accounting.
        (viii) If specified in Item 9.4, appendix A of this section, the equipment shall be arranged to store the billing data in a pollable system. If specified in Item 9.5, appendix A of this section, equipment shall be furnished to poll the pollable systems associated with the contract.
        (l) Fusing and protection requirements -- (1) General. (i) The equipment shall be completely wired and equipped with fuses, trouble signals, and arranged for printout of fault conditions, with all associated equipment for the wired capacity of the frames or cabinets provided.
        (ii) Design precautions shall be taken to prevent the possibility of equipment damage arising from the insertion of an electronic package into the wrong connector, the removal of a package from any connector, or the improper insertion of the correct card in its connector.
        (2) Fuses. Fuses and circuit breakers shall be of an alarm and indicator type, except where the fuses or breaker location is indicated on the alarm printout. Their rating shall be designated by numerals or color code on the fuse panel, where feasible.
        (3) Components. (i) Insofar as possible, all components shall be capable of being continuously energized at rated voltage without injurious results. Insofar as possible, design precautions shall be taken to prevent damage to other equipment and components when a particular component fails.
        (ii) Printed circuit boards or similar equipment employing electronic components shall be self-protecting against external grounds applied to the connector terminals, where feasible. Board components and coatings applied to finished products shall be of such material or treated so they will not support combustion.
        (iii) Every precaution shall be taken to protect electrostatically sensitive components from damage during handling. This shall include written instructions and recommendations (see Item 6.1,h of appendix C of this section).
        (m) Switching network requirements -- (1) The network. (i) All networks shall be comprised of solid-state components.
        (ii) The switching network shall employ time division digital switching and be compatible for connection to D3 type PCM channel banks without conversion to analog.
        (iii) Equipment shall be available as required to connect analog lines and trunks, analog or digital service circuits, digital carriers to RST's, D3 channel banks or other digital switching units.
        (2) Network quantity. Where the number of stages in the switching network and their control varies with the capacity of the system, sufficient equipment and wiring shall be supplied initially in order that there will be no service interruptions when additions are made up to the ultimate capacity as specified in appendix A of this section. This does not imply the necessity of supplying empty cabinets unless this is the only way the necessary wiring can be accomplished.
        (n) Stored program control (SPC) equipment requirements. (1) The system shall provide redundancy in call processing such that the failure of a call processing unit does not degrade the call processing capabilities of the switching system nor result in the loss of established calls.
        (2) Programs shall be modular, flexible and structured. In the interest of more dependable and more easily read programs, it is desirable to use a language which is more person-oriented leaving the detailed machine-oriented problems to a compiler program. Quality assurance of all software programs shall be in accordance with IEEE Std 730 - 1989, IEEE Standard for Software Quality Assurance Plans, or equivalent.
        (3) The office administration program shall have checks within it to prevent failure due to erroneous or inconsistent input data. It shall safeguard against the possibility of upsetting machine performance with improper instructions or information. In addition, modular structure shall allow the use of a variety of human-engineered service order formats. Service changes may be performed remotely if so desired. Average machine time for service change shall be 15 seconds or less. Service changes shall not be registered in permanent memory until verified. The access to the service change shall not have access to generic program.
        (4) The switching system shall be able to offer, by request, at least the following printouts of its routine stored data for administrative purposes:
        (i) A list of all assigned directory numbers, in numerical order, with their assigned class of service and line terminal numbers;
        (ii) A list of all directory numbers, in numerical order, associated with a class of service;
        (iii) A list of all unassigned line terminals;
        (iv) Traffic data in proper form for separation studies in accordance with the revenue separations procedures current at the time of the contract;
        (v) All lines on lockout;
        (vi) All lines assigned to intercept;
        (vii) All available (unassigned) directory numbers in the working thousands group; and
        (viii) A list of equipment busied out for maintenance.
        (5) The printouts in paragraph (n)(4) of this section may be delayed to times of light traffic.
        (6) Maintenance diagnostics shall be performed by a fault recognition system utilizing both software and hardware, each being used where they are most effective for maintenance and reliability. In the economic interests of providing early and efficient fault detection and accurate pinpointing of faulty areas, it is desirable to have a comprehensive person-machine interface supported by extensive automatic fault detection and analysis, involving diagnostic software for fault resolution and automatic recovery mechanisms to maintain continuous service. Maintenance messages may be channeled to a remote maintenance center if so desired.
        (7) Information in memory, having no requirement for changes to be introduced in the maintenance or operation of the system, may be stored in memory devices such as programmable read-only memory (PROM) or other devices that cannot be reprogrammed in the field.
        (o) Maintenance facilities -- (1) Alarm features, including alarm sending. (i) The equipment shall be arranged to provide audible and visual alarms indicating fuse operation or other circuit malfunctions resulting from component failure, crosses or open wiring, or any other conditions affecting service which can be detected economically.
        (ii) The alarms shall be classified in accordance with their effect on the system.
        (A) Catastrophic alarms demand immediate attention and require notification of the highest level of supervisory personnel. Conditions such as loss of service, loss of one or more remote line switches or line concentrators connected through Direct Digital Interface, loss of network control, and loss of computer program in all processors shall produce catastrophic alarms.
        (B) Major alarms demand rapid action. Conditions such as loss of one or more groups of subscribers or trunk ports, blown fuses for common groups of channels, loss of control to groups of channels, failure of one or both redundant units, and total loss of battery charging current for more than 15 minutes shall produce major alarms.
        (C) Minor alarms indicate nonemergency conditions which cause degraded service or fault conditions which causes the system to operate within less-than-optimum performance. Conditions discovered in automatic routining which have not shown in the operation of the equipment but require attention and cumulative line lockout (level adjustable) are examples of minor alarm conditions.
        (iii) When the office is arranged for unattended operation, facilities shall be provided for extending the alarm indications to an attended point.
        (iv) When the use of a separate outside plant facility for alarm sending is specified, the nature of the alarm may be indicated to the distant point by machine printout or other display device.
        (v) When alarm sending is accomplished over a regular operator office trunk, the operator shall be apprised that the call is an alarm indication by a distinctive tone, as specified by the owner in appendix A of this section. It shall be possible for the operator to determine at any time the presence of a trouble condition by dialing a number set aside for that purpose. This number shall also be accessible from lines classmarked for this feature.
        (vi) When the alarm sending circuit seizes an interoffice operator trunk, the operator must dial the alarm checking code over another trunk before the first trunk can be released except where the alarm condition has disappeared first.
        (vii) The alarm sending circuit shall have access to two or more trunks if the trunks are used for subscriber traffic.
        (viii) An alarm indication of higher priority shall supersede an original alarm indication and reseize an interoffice operator trunk.
        (ix) In any group of offices purchased under one contract, the same codes shall be used in each office for alarm checking and test.
        (x) When the alarm checking number is dialed, the alarm indications received shall be as follows:
        (A) Catastrophic alarm -- No tone.
        (B) Major alarm -- Continuous busy tone 60 IPM, unless alarm is overridden.
        (C) Minor alarm -- Continuous 1-ring code ringback tone, unless alarm is overridden._
        (D) No trouble -- Continuous 2-ring code ringback tone, unless alarm is overridden.
        (xi) Audible and visual local alarms and transmitted alarms shall
(TABLE START)be provided as follows:
@h1 @h2Classification
@h1Delay Interval @h2Local Alarms@h2Alarms Transmitted
        Catastrophic  .... 0  .... 0
        Major  .... 0  .... 0\1\
        Minor  .... 0  .... 0 - 30 Min.
Footnote: \1\Except no charge alarm delayed 15 minutes.
(TABLE END)
        (xii) The central office alarm circuits shall be arranged to provide optional wiring to transmit either a minor alarm or a major alarm and a printout to accommodate various types of trunk and subscriber carrier systems, microwave, mobile radio, other transmission systems, and environmental protection systems with different priorities when a set of contacts is closed in the equipment of such systems and the alarm checking code is dialed. The alarm relay shall be furnished by the supplier of the carrier multiplex and/or mobile radio equipment. The option or options shall be specified by the owner.
        (2) Trouble location and test. (i) Equipment. (A) A maintenance center shall be provided with a fault recorder (printer and/or display) for troubles. Here, system and sub-system visual trouble indications are shown for maintenance aid.
        (B) The fault recorder shall provide a permanent or semi-permanent record of the circuit elements involved whenever a trouble is encountered. It shall be arranged to recognize an existing fault condition and not cause multiple printouts of the same fault, except during test routine.
        (ii) Maintenance system. (A) The maintenance system shall monitor and maintain the system operation without interruption of call processing, except for major failures.
        (B) The maintenance system shall provide both specialized maintenance hardware circuits and an extensive software package to enable maintenance to determine trouble to an individual card or functional group of cards.
        (C) Maintenance programs may be both on-line and off-line. On-line maintenance programs are activated by system errors and shall be scheduled to execute call tests during low traffic periods and periodic hardware tests at specific time intervals. Programs shall provide diagnostic tools for the maintenance personnel and be initiated by them.
        (D) Scheduled periodic hardware tests shall automatically detect faults and alert maintenance personnel via alarm or appropriate input/output device(s) at local and/or remote locations.
        (E) Facilities shall be provided so that test calls can be set up using pre-selected items of switching equipment.
        (F) The maintenance personnel shall be able to make tests to determine if every trunk and every item of switching equipment are functioning properly. Also, it shall be possible to make each trunk and each SPC equipment, or part thereof, busy to service calls. Where possible, equipment which is made busy to service calls shall still be accessible for test calls.
        (iii) Outside plant and subscriber stations. (A) A subscriber loop test set or equivalent shall be provided either as a separate set or as a part of the maintenance center, as specified in item 11.2 of appendix A of this section. This circuit shall include a high resistance volt-ohm meter, wiring to tip and ring terminals to permit a portable wheatstone bridge to be used, an operator's telephone circuit, a dial circuit (and pushbutton dialing keys, if specified), outgoing trunks to dial equipment for access to lines under test without use of the main distributing frame (MDF) test shoe and the necessary test keys. No dry cell batteries shall be accepted for test potentials. Circuits shall be designed so that alternating current (ac) induction on the line will have no effect on dc measurements. All functions shall be under control of lever or pushbutton keys. As a minimum the test system shall:
        (1) Test for bridged foreign electromotive force (EMF);
        (2) Test for regular line battery;
        (3) Test for booster battery voltage and polarity using the test shoe;
        (4) Test for open circuits, short, tip ground, and ring ground;
        (5) Test for tip or ring negative potential;
        (6) Test for capacitance of a subscriber's line;
        (7) Supply talking battery to the line with and without booster battery;
        (8) Ring the subscriber through the test access circuit or through a test shoe;
        (9) Test in and out of the central office; and
        (10) Supply a reverse polarity key for voltage readings, except when positive or negative values are displayed directly.
        (B) An acceptable arrangement for making the tests shown in paragraph (o)(2)(iii)(A) of this section is to have them under software control with results displayed at one of the system's I/O ports.
        (C) A howler circuit for maintenance purposes, if ordered by the owner, shall have output tones which do not interfere with the pushbutton or multifrequency signaling tones. The harmonics of the output tones shall be attenuated at least 26 dB below the fundamental frequency for all load conditions. The frequency stability shall be 2 percent or less for all output tones when the unit is operated in the specified load and environmental range. It shall be possible to vary the output voltage (power) of the howler circuit. It shall remove tone and restore the line to service when the telephone instrument receiver is placed on-hook. The frequency of the output shall be chosen to be distinctive and urgent in order to attract the subscriber's attention to an off-hook situation.
        (D) When a dial speed test facility is specified by the owner, it shall be accessed by dialing a special code and shall return to the calling station readily identifiable signals to indicate that the dial speed is slow, normal, or fast.
        (E) When the office is arranged for pushbutton dialing, optional facilities shall be provided for testing the pushbutton dialing equipment at the subscriber station.
        (F) When a system for testing subscriber lines in remote offices from a test position in a centrally located office is specified by the owner, it shall be capable of working with all the central offices and RST's in the remote areas. This testing equipment shall preferably be solid-state with a minimum of electromechanical devices and shall operate from central office battery. It shall be capable of working over any voice grade telephone circuit and shall not require a dedicated trunk. There shall be no interference to or from ``in-band'' voice channel tones. When used over a network, the verification or access shall be guarded to prevent unauthorized access by subscribers. Access to this system shall only be available to the test operator in all cases.
        (3) Transmission testing. (i) When transmission test circuits are specified in Item 11.3 of appendix A of this section, they shall permit testing of trunks by a distant office without any assistance in the local dial office. Analog test ports shall meet appropriate trunk requirements. If Centralized Automatic Reporting on Trunks (CAROT), or equivalent, is to be used, the equipment at the end office shall comply with Bellcore document SR-TSV-002275, BOC Notes on the LEC Networks -- 1990, section 8, Item 2.
        (ii) Transmission test circuits are available with a variety of options. These include single frequency and multifrequency tone generators with one or more generator output terminals, quiet terminations, and loop around test arrangements for both one-way and two-way trunks.
        (iii) Where multifrequency generators are used, they are usually arranged to provide a minimum of three frequencies. With some equipment, up to seven additional frequencies may be provided if needed. No industry standardization of test frequencies is as yet provided. Therefore, it is important that the selection of frequencies, the order in which they are applied and the time interval for application of each frequency be agreed upon by the connecting company and the RUS borrower and listed in appendix A of this section in those situations where connecting companies request the installation of multifrequency generators in borrowers' central offices.
        (iv) The milliwatt generator shall be solid-state and generate the analog or digital equivalent of 1004 Hz. The milliwatt generator shall be assigned to a 4-wire analog test port or be digitally generated. All 2-wire and 4-wire voice frequency ports are at a nominal 0 dBm0 level. The level of the 1004 Hz tone generator shall appear at outgoing 2-wire and 4-wire ports at 0 dBm 1B 0.5 dB. For direct digital connections, the encoded output shall be the digital equivalent of a 0 dBm0 1B 0.5 dB signal.
        (v) Reference tone generators can be used individually or they can be part of a loop around test arrangement. If both single frequency and multifrequency reference tone generators are to be provided, only one can be arranged as part of a loop around test. Where a loop around arrangement is provided, the generator output can be obtained by dialing singly one of the two line terminals. By dialing the other line terminal singly, usually a 900 ohm resistor in series with a 2.16 microfarad capacitor is connected to the circuit under test to act as a ``quiet termination'' for noise measurements and other tests. Whenever both line terminals are held simultaneously, both the milliwatt supply and the quiet termination shall be lifted off and a ``loop around'' condition established. This permits the overall loss to be determined from the distant office by going out over one trunk, looping around in the end office and returning over the other trunk. The insertion loss of this test arrangement when used in a loop around configuration should not exceed 0.1 dB at the frequencies specified for the milliwatt supply. Unless otherwise specified, continuous off-hook supervision is to be provided on both line terminals to prevent collusive calling without charge. It will be permissible to accomplish the quiet termination by opening the 4-wire path internally and to accomplish the loop around by digital switching.
        (vi) Provision shall be made so that the milliwatt supply can be manually patched to circuits.
        (vii) Test jack access shall be provided for all interoffice trunks of the voice frequency type. The jack access shall be properly designated for line, drop, monitor, and signaling leads plus any other jacks as requested by the owner. This may be accomplished by a set of jacks located at the maintenance center which have access to each trunk on a switching basis.
        (p) Traffic -- (1) General engineering guidelines. (i) The Traffic Table, based on the Erlang Lost-Calls-Cleared Formula, shall be used for determining the quantity of intraoffice paths, registers, and senders where full availability conditions apply. The following table shows the
(TABLE START)traffic capacity in CCS for 1 to 200 trunks at nine grades of service.
Traffic Table
Full Availability for Random Traffic
Lost-Calls-Cleared
Offered Traffic Expressed in CCS
@h1Number of Trunks
@h1B-.001
@h1.002
@h1.005
@h1.01
@h1.02
@h1.05
@h1.1
@h1.2
@h1.5
@h1Number of Trunks
1  .... 0  .... 0  .... 0  .... 0  .... 1  .... 2  .... 4  .... 9  .... 36  .... 1
2  .... 2  .... 3  .... 4  .... 5  .... 8  .... 14  .... 22  .... 36  .... 98  .... 2
3  .... 7  .... 9  .... 13  .... 17  .... 22  .... 32  .... 46  .... 69  .... 165  .... 3
4  .... 16  .... 19  .... 25  .... 31  .... 39  .... 55  .... 74  .... 106  .... 234  .... 4
5  .... 27  .... 32  .... 41  .... 49  .... 60  .... 80  .... 104  .... 144  .... 304  .... 5
6  .... 41  .... 48  .... 58  .... 69  .... 82  .... 107  .... 135  .... 184  .... 374  .... 6
7  .... 57  .... 65  .... 78  .... 90  .... 106  .... 135  .... 168  .... 224  .... 445  .... 7
8  .... 74  .... 83  .... 98  .... 113  .... 131  .... 163  .... 202  .... 265  .... 516  .... 8
9  .... 92  .... 103  .... 120  .... 136  .... 156  .... 193  .... 236  .... 307  .... 586  .... 9
10  .... 111  .... 123  .... 143  .... 161  .... 183  .... 224  .... 270  .... 348  .... 656  .... 10
11  .... 131  .... 145  .... 166  .... 186  .... 210  .... 255  .... 306  .... 391  .... 729  .... 11
12  .... 152  .... 167  .... 190  .... 212  .... 238  .... 286  .... 341  .... 433  .... 801  .... 12
13  .... 174  .... 190  .... 215  .... 238  .... 266  .... 318  .... 377  .... 476  .... 872  .... 13
14  .... 196  .... 213  .... 240  .... 265  .... 295  .... 350  .... 413  .... 519  .... 944  .... 14
15  .... 219  .... 237  .... 266  .... 292  .... 324  .... 383  .... 449  .... 562  .... 1015  .... 15
16  .... 242  .... 261  .... 292  .... 320  .... 354  .... 415  .... 486  .... 605  .... 1087  .... 16
17  .... 266  .... 286  .... 318  .... 347  .... 384  .... 449  .... 523  .... 648  .... 1158  .... 17
18  .... 290  .... 311  .... 345  .... 376  .... 414  .... 482  .... 560  .... 692  .... 1230  .... 18
19  .... 314  .... 337  .... 372  .... 404  .... 444  .... 515  .... 597  .... 735  .... 1302  .... 19
20  .... 339  .... 363  .... 399  .... 433  .... 474  .... 549  .... 634  .... 779  .... 1374  .... 20
21  .... 364  .... 388  .... 427  .... 462  .... 505  .... 583  .... 671  .... 823  .... 1445  .... 21
22  .... 389  .... 415  .... 455  .... 491  .... 536  .... 617  .... 709  .... 866  .... 1517  .... 22
23  .... 415  .... 441  .... 483  .... 521  .... 567  .... 651  .... 747  .... 910  .... 1589  .... 23
24  .... 441  .... 468  .... 511  .... 551  .... 599  .... 685  .... 784  .... 954  .... 1661  .... 24
25  .... 467  .... 495  .... 540  .... 580  .... 630  .... 720  .... 822  .... 998  .... 1733  .... 25
26  .... 493  .... 523  .... 568  .... 611  .... 662  .... 754  .... 860  .... 1042  .... 1805  .... 26
27  .... 520  .... 550  .... 598  .... 641  .... 693  .... 788  .... 898  .... 1086  .... 1876  .... 27
28  .... 546  .... 578  .... 627  .... 671  .... 725  .... 823  .... 936  .... 1130  .... 1948  .... 28
29  .... 573  .... 606  .... 656  .... 702  .... 757  .... 858  .... 974  .... 1174  .... 2020  .... 29
30  .... 600  .... 634  .... 685  .... 732  .... 789  .... 893  .... 1012  .... 1218  .... 2092  .... 30
31  .... 628  .... 662  .... 715  .... 763  .... 822  .... 928  .... 1050  .... 1263  .... 2164  .... 31
32  .... 655  .... 690  .... 744  .... 794  .... 854  .... 963  .... 1089  .... 1307  .... 2236  .... 32
33  .... 683  .... 719  .... 774  .... 825  .... 887  .... 998  .... 1127  .... 1351  .... 2308  .... 33
34  .... 711  .... 747  .... 804  .... 856  .... 919  .... 1033  .... 1165  .... 1395  .... 2380  .... 34
35  .... 739  .... 776  .... 834  .... 887  .... 951  .... 1068  .... 1203  .... 1439  .... 2452  .... 35
36  .... 767  .... 805  .... 864  .... 918  .... 984  .... 1104  .... 1242  .... 1484  .... 2524  .... 36
37  .... 795  .... 834  .... 895  .... 950  .... 1017  .... 1139  .... 1281  .... 1528  .... 2595  .... 37
38  .... 823  .... 863  .... 925  .... 981  .... 1050  .... 1174  .... 1319  .... 1572  .... 2667  .... 38
39  .... 851  .... 892  .... 955  .... 1013  .... 1083  .... 1210  .... 1358  .... 1617  .... 2739  .... 39
40  .... 880  .... 922  .... 986  .... 1044  .... 1116  .... 1246  .... 1396  .... 1661  .... 2811  .... 40
41  .... 909  .... 951  .... 1016  .... 1076  .... 1149  .... 1281  .... 1435  .... 1706  .... 2883  .... 41
42  .... 937  .... 980  .... 1047  .... 1108  .... 1182  .... 1317  .... 1474  .... 1750  .... 2955  .... 42
43  .... 966  .... 1010  .... 1078  .... 1140  .... 1215  .... 1352  .... 1512  .... 1795  .... 3027  .... 43
44  .... 995  .... 1040  .... 1109  .... 1171  .... 1248  .... 1388  .... 1551  .... 1839  .... 3099  .... 44
45  .... 1024  .... 1070  .... 1140  .... 1203  .... 1282  .... 1424  .... 1590  .... 1884  .... 3171  .... 45
46  .... 1053  .... 1099  .... 1171  .... 1236  .... 1315  .... 1459  .... 1629  .... 1928  .... 3243  .... 46
47  .... 1083  .... 1129  .... 1202  .... 1268  .... 1349  .... 1495  .... 1668  .... 1973  .... 3315  .... 47
48  .... 1112  .... 1159  .... 1233  .... 1300  .... 1382  .... 1531  .... 1706  .... 2017  .... 3387  .... 48
49  .... 1141  .... 1189  .... 1264  .... 1332  .... 1416  .... 1567  .... 1745  .... 2062  .... 3459  .... 49
50  .... 1170  .... 1220  .... 1295  .... 1364  .... 1449  .... 1603  .... 1784  .... 2106  .... 3531  .... 50
51  .... 1200  .... 1250  .... 1327  .... 1397  .... 1483  .... 1639  .... 1823  .... 2151  .... 3603  .... 51
52  .... 1229  .... 1280  .... 1358  .... 1429  .... 1516  .... 1675  .... 1862  .... 2195  .... 3675  .... 52
53  .... 1259  .... 1310  .... 1390  .... 1462  .... 1550  .... 1711  .... 1901  .... 2240  .... 3747  .... 53
54  .... 1289  .... 1341  .... 1421  .... 1494  .... 1584  .... 1747  .... 1940  .... 2285  .... 3819  .... 54
55  .... 1319  .... 1371  .... 1453  .... 1527  .... 1618  .... 1783  .... 1979  .... 2329  .... 3891  .... 55
56  .... 1349  .... 1402  .... 1484  .... 1559  .... 1652  .... 1819  .... 2018  .... 2374  .... 3962  .... 56
57  .... 1378  .... 1432  .... 1516  .... 1592  .... 1686  .... 1856  .... 2057  .... 2418  .... 4034  .... 57
58  .... 1408  .... 1463  .... 1548  .... 1625  .... 1719  .... 1892  .... 2096  .... 2463  .... 4106  .... 58
59  .... 1439  .... 1494  .... 1579  .... 1657  .... 1753  .... 1928  .... 2136  .... 2508  .... 4178  .... 59
60  .... 1468  .... 1525  .... 1611  .... 1690  .... 1787  .... 1965  .... 2174  .... 2552  .... 4250  .... 60
61  .... 1499  .... 1556  .... 1643  .... 1723  .... 1821  .... 2001  .... 2214  .... 2597  .... 4322  .... 61
62  .... 1529  .... 1587  .... 1675  .... 1756  .... 1855  .... 2037  .... 2253  .... 2642  .... 4394  .... 62
63  .... 1559  .... 1617  .... 1707  .... 1789  .... 1889  .... 2073  .... 2292  .... 2687  .... 4466  .... 63
64  .... 1590  .... 1648  .... 1739  .... 1822  .... 1923  .... 2110  .... 2331  .... 2731  .... 4538  .... 64
65  .... 1620  .... 1679  .... 1771  .... 1855  .... 1958  .... 2146  .... 2370  .... 2776  .... 4610  .... 65
66  .... 1650  .... 1710  .... 1803  .... 1888  .... 1992  .... 2182  .... 2409  .... 2821  .... 4682  .... 66
67  .... 1681  .... 1742  .... 1835  .... 1921  .... 2026  .... 2219  .... 2449  .... 2865  .... 4754  .... 67
68  .... 1711  .... 1773  .... 1867  .... 1954  .... 2060  .... 2255  .... 2488  .... 2910  .... 4826  .... 68
69  .... 1742  .... 1804  .... 1900  .... 1987  .... 2094  .... 2291  .... 2527  .... 2955  .... 4898  .... 69
70  .... 1773  .... 1835  .... 1932  .... 2020  .... 2129  .... 2328  .... 2566  .... 3000  .... 4970  .... 70
71  .... 1803  .... 1867  .... 1964  .... 2053  .... 2163  .... 2364  .... 2606  .... 3044  .... 5042  .... 71
72  .... 1834  .... 1898  .... 1997  .... 2087  .... 2197  .... 2401  .... 2645  .... 3089  .... 5114  .... 72
73  .... 1865  .... 1929  .... 2029  .... 2120  .... 2232  .... 2438  .... 2684  .... 3134  .... 5186  .... 73
74  .... 1895  .... 1961  .... 2061  .... 2153  .... 2266  .... 2474  .... 2723  .... 3178  .... 5258  .... 74
75  .... 1926  .... 1992  .... 2093  .... 2186  .... 2300  .... 2511  .... 2763  .... 3223  .... 5330  .... 75
76  .... 1957  .... 2024  .... 2126  .... 2219  .... 2335  .... 2547  .... 2802  .... 3268  .... 5402  .... 76
77  .... 1988  .... 2055  .... 2159  .... 2253  .... 2369  .... 2584  .... 2841  .... 3313  .... 5474  .... 77
78  .... 2019  .... 2087  .... 2191  .... 2286  .... 2404  .... 2620  .... 2881  .... 3357  .... 5546  .... 78
79  .... 2050  .... 2118  .... 2223  .... 2319  .... 2438  .... 2657  .... 2920  .... 3402  .... 5618  .... 79
80  .... 2081  .... 2150  .... 2256  .... 2353  .... 2473  .... 2694  .... 2959  .... 3447  .... 5690  .... 80
81  .... 2112  .... 2182  .... 2289  .... 2386  .... 2507  .... 2730  .... 2999  .... 3492  .... 5762  .... 81
82  .... 2143  .... 2213  .... 2321  .... 2420  .... 2542  .... 2767  .... 3038  .... 3537  .... 5834  .... 82
83  .... 2174  .... 2245  .... 2354  .... 2453  .... 2577  .... 2803  .... 3077  .... 3581  .... 5906  .... 83
84  .... 2206  .... 2277  .... 2386  .... 2487  .... 2611  .... 2840  .... 3117  .... 3626  .... 5977  .... 84
85  .... 2237  .... 2309  .... 2419  .... 2521  .... 2646  .... 2877  .... 3156  .... 3671  .... 6049  .... 85
86  .... 2268  .... 2340  .... 2452  .... 2554  .... 2680  .... 2913  .... 3196  .... 3716  .... 6121  .... 86
87  .... 2299  .... 2372  .... 2485  .... 2588  .... 2715  .... 2950  .... 3235  .... 3761  .... 6193  .... 87
88  .... 2331  .... 2404  .... 2517  .... 2621  .... 2750  .... 2987  .... 3275  .... 3805  .... 6265  .... 88
89  .... 2362  .... 2436  .... 2550  .... 2655  .... 2784  .... 3024  .... 3314  .... 3850  .... 6337  .... 89
90  .... 2393  .... 2468  .... 2583  .... 2688  .... 2819  .... 3060  .... 3353  .... 3895  .... 6409  .... 90
91  .... 2425  .... 2500  .... 2616  .... 2722  .... 2854  .... 3097  .... 3393  .... 3940  .... 6481  .... 91
92  .... 2456  .... 2532  .... 2649  .... 2756  .... 2889  .... 3134  .... 3432  .... 3984  .... 6553  .... 92
93  .... 2488  .... 2564  .... 2682  .... 2790  .... 2923  .... 3171  .... 3471  .... 4029  .... 6625  .... 93
94  .... 2519  .... 2596  .... 2715  .... 2823  .... 2958  .... 3208  .... 3511  .... 4074  .... 6697  .... 94
95  .... 2551  .... 2628  .... 2748  .... 2857  .... 2993  .... 3244  .... 3551  .... 4119  .... 6769  .... 95
96  .... 2582  .... 2660  .... 2781  .... 2891  .... 3028  .... 3281  .... 3590  .... 4164  .... 6841  .... 96
97  .... 2614  .... 2692  .... 2814  .... 2925  .... 3063  .... 3318  .... 3630  .... 4209  .... 6913  .... 97
98  .... 2645  .... 2724  .... 2847  .... 2958  .... 3097  .... 3355  .... 3669  .... 4253  .... 6985  .... 98
99  .... 2677  .... 2757  .... 2880  .... 2992  .... 3132  .... 3392  .... 3708  .... 4298  .... 7057  .... 99
100  .... 2709  .... 2789  .... 2913  .... 3026  .... 3167  .... 3429  .... 3748  .... 4343  .... 7129  .... 100
105  .... 2867  .... 2950  .... 3078  .... 3196  .... 3342  .... 3613  .... 3946  .... 4567  .... 7489  .... 105
110  .... 3027  .... 3112  .... 3244  .... 3366  .... 3516  .... 3798  .... 4143  .... 4792  .... 7849  .... 110
115  .... 3186  .... 3275  .... 3411  .... 3536  .... 3691  .... 3983  .... 4341  .... 5016  .... 8209  .... 115
120  .... 3347  .... 3437  .... 3578  .... 3707  .... 3867  .... 4168  .... 4539  .... 5241  .... 8569  .... 120
125  .... 3507  .... 3601  .... 3745  .... 3878  .... 4043  .... 4353  .... 4737  .... 5465  .... 8929  .... 125
130  .... 3669  .... 3765  .... 3912  .... 4049  .... 4219  .... 4539  .... 4935  .... 5689  .... 9289  .... 130
135  .... 3830  .... 3929  .... 4081  .... 4221  .... 4395  .... 4724  .... 5133  .... 5914  .... 9649  .... 135
140  .... 3992  .... 4093  .... 4249  .... 4392  .... 4571  .... 4910  .... 5332  .... 6138  .... 10009  .... 140
145  .... 4155  .... 4258  .... 4418  .... 4564  .... 4748  .... 5095  .... 5530  .... 6363  .... 10369  .... 145
150  .... 4318  .... 4423  .... 4586  .... 4737  .... 4925  .... 5282  .... 5728  .... 6587  .... 10729  .... 150
155  .... 4481  .... 4589  .... 4755  .... 4909  .... 5102  .... 5467  .... 5927  .... 6812  .... 11089  .... 155
160  .... 4644  .... 4755  .... 4925  .... 5082  .... 5279  .... 5654  .... 6125  .... 7037  .... 11449  .... 160
165  .... 4808  .... 4920  .... 5094  .... 5255  .... 5457  .... 5840  .... 6324  .... 7261  .... 11809  .... 165
170  .... 4972  .... 5087  .... 5264  .... 5428  .... 5634  .... 6026  .... 6523  .... 7486  .... 12169  .... 170
175  .... 5137  .... 5253  .... 5434  .... 5602  .... 5811  .... 6213  .... 6722  .... 7710  .... 12529  .... 175
180  .... 5301  .... 5420  .... 5604  .... 5775  .... 5989  .... 6399  .... 6920  .... 7935  .... 12889  .... 180
185  .... 5466  .... 5587  .... 5775  .... 5949  .... 6167  .... 6586  .... 7119  .... 8160  .... 13249  .... 185
190  .... 5631  .... 5754  .... 5945  .... 6123  .... 6345  .... 6773  .... 7318  .... 8384  .... 13609  .... 190
195  .... 5797  .... 5922  .... 6116  .... 6296  .... 6524  .... 6960  .... 7517  .... 8609  .... 13969  .... 195
200  .... 5962  .... 6089  .... 6287  .... 6471  .... 6702  .... 7146  .... 7716  .... 8834  .... 14329  .... 200
(TABLE END)
        (ii) The traffic capacity for all interoffice trunks shall be based on full availability, even though the distant office itself is not engineered to provide full availability access.
        (iii) The Traffic Table may also be used to determine the approximate traffic capacity of high-usage intertoll trunks. The traffic offered to high-usage groups may be read at B.10, signifying that 10 percent of the traffic overflows to the alternate route. This approximates the HU12 table used by AT&T.
        (iv) In reading the trunk quantity from the table, the higher quantity shall be used when the CCS load is three or more CCS over the lower quantity. For example, the number of trunks justified for 294 CCS at B.005 is 16, but for 295 CCS 17 trunks are justified.
        (v) Limited availability is not permitted.
        (vi) The traffic capacity in the following table should be used for small trunk groups such as pay station, special service trunks, intercept,
(TABLE START)and PBX trunks, unless otherwise specified in appendix A of this section:
@h1Number of Circuits
@h1Permissible CCS
        1  .... 10
        2  .... 20
        3  .... 30
        4  .... 40
(TABLE END)
        (vii) The percentage of lines equipped for pushbutton dialing is to be used to determine the number of tone receivers. Local registers, if required, shall be supplied on the basis of all dial pulse.
        (2) Grade of service. (i) Grade of service specifies the expected performance when there are adequate service facilities for an assumed volume of traffic. It is expressed as a portion of the total traffic during a busy hour that cannot be terminated immediately or within a predetermined time period due to congestion. This places responsibility on the traffic engineers to specify facilities which will be entirely satisfactory to the users and which can be equipped at a price which will be accepted as reasonable.
        (ii) The number of calls encountering dial tone delay in excess of 3 seconds, measured over the busy hour of the four high-consecutive week (4HW) period, shall not be more than 1.5 percent.
        (iii) The average post dialing delay objective for an intraoffice call shall not exceed 1 second. This includes all connect, operate, and translation time.
        (iv) The line to line (intraoffice) network matching loss objective shall be 0.02 or less.
        (v) The blocking probabilities related to trunks include both ``mismatch'' probability and probability of ``all trunks busy.'' It is likely that the ``mismatch'' will be negligible in that many digital central offices have essentially nonblocking switching characteristics. The objectives for trunk connections are as follows:
        (A) Subscriber to outgoing trunk objective 0.01 or less;
        (B) Incoming trunk to subscriber objective 0.02 or less; and
        (C) Local trunk tandem objective 0.01 or less.
        (vi) Groups of common service circuits are to be engineered utilizing the full availability traffic tables that appear in paragraph (p)(1)(i) of this section at the following stipulated probabilities:
        (A) Outgoing trunks to 2/6 MF or dial pulse senders at B.001;
        (B) Incoming trunks to 2/6 MF receivers at B.001;
        (C) Incoming nondelay dial trunks to receivers at B.001; and
        (D) Incoming trunks with start dial at B.01.
        (vii) Remote Switching Terminals (RST's) shall meet the same grade of service objectives as the host.
        (3) Holding times. For the purpose of estimating the quantity of common control circuits, the following average holding times may be used. These holding times are conservative and represent the average effective and ineffective call. If these holding times are to be used, it must be so stated in appendix A of this section.
(TABLE START)
        (i) The following average call holding times (HT) may be used.
@h1Type of Call
@h1HT -- Seconds
        Intraoffice  .... 120
        Revertive  .... 150
        EAS  .... 150
        Special Service, Intercept, Verification  .... 60
        Toll, CLR  .... 300
        Toll, S-S  .... 24
        Toll, PPCS  .... 270
(TABLE END)
        (ii) The following average subscriber dialing holding times may be
(TABLE START)used (times used to dial digits do not include machine time).
@h1
@h1Digits Dialed
@h1DP Sec.
@h1Pushbutton Sec.
        Operator, Non-Pay Station  .... 1  .... 4.7  .... 3.4
        Special Service  .... 3  .... 7.7  .... 5.0
        Local  .... 7  .... 13.7  .... 8.2
        EAS  .... 7  .... 13.7  .... 8.2
        DDD: 1/0+7  .... 8  .... 15.2  .... 9.0
        DDD: 1/0+10  .... 11  .... 19.7  .... 11.4
        Dialing Time Per Digit  .... -  .... 1.5  .... 0.8
        Dial Tone Response  .... -  .... 3.2  .... 2.6
(TABLE END)
        (iii) The following average incoming register holding times may be
(TABLE START)used (times for digit registrations do not include machine time).
@h1
@h1Basic@h2 Holding Time (Sec.)@h2Digits
@h1Additional Per Digit
        MF Receiver from:
No. 5 Crossbar -- Non-LAMA  .... 1.4  .... 4  .... 0.14
No. 5 Crossbar -- LAMA  .... 2.3  .... 4  .... 0.14
Crossbar Tandem & 4A Toll  .... 3.1  .... 4  .... 0.14
No. 1 ESS  .... 1.4  .... 4  .... 0.14
        Key Pulsing Switchboard  .... 5.2  .... 4  .... 0.60
        DP Receivers -- 10 PPS from:
SxS  .... 6.0  .... 4  .... 1.5
Dialing Switchboard  .... 6.6  .... 4  .... 1.3
4A Toll  .... 5.6  .... 5\1\  .... -
Crossbar Tandem  .... 4.9  .... 4  .... 1.2
Footnote: \1\No reduction for fewer digits.
(TABLE END)
        (iv) The following average sender holding times may be used (does
(TABLE START)not include machine setup and release time).
@h1
@h1Basic@h2 Holding Time (Sec.)@h2Digits
@h1Additional Per Digit
        MF Senders:
No. 5 Crossbar  .... 1.5  .... 4  .... 0.14
Crossbar Tandem & 4A Toll\1\  .... 2.0  .... 4  .... 0.14
TSP/TSPS  .... 2.4  .... 7  .... 0.14
SxS -- CAMA, Called Number  .... 3.7  .... 7  .... 0.14
SxS -- CAMA, Calling Number  .... 1.3  .... 7  .... -
        DP Senders -- 10 PPS:
With Overlap Pulsing\2\  .... 9.1  .... Up to 6  .... 1.8
Without Overlap Pulsing  .... 4.6  .... 4  .... 1.2
Footnote: \1\Add 1.3 seconds for ANI outpulsing on special toll (0+) calls and on DDD calls if AMA is not provided.
Footnote: \2\Assumes overlap outpulsing starting on receiving of third digit; applies only to calls handled on direct trunk groups.
(TABLE END)
        (4) Traffic data requirements. (i) Traffic measurements are composed of primarily two types -- counts and usage. The following types of traffic data recording are required:
        (A) Peg count registers shall be incremented when a successful network connection is established to a particular circuit group such as trunks, senders, digital receivers, etc.
        (B) Overflow count registers shall be incremented when access to a particular circuit group is denied due to all resource busy condition.
        (C) Network blockage count registers shall be incremented due to an unavailability of a path in an access or switching matrix network.
        (D) Usage measurements of the length of time associated with a particular setup event or network connection shall be made. Usage data measurements are normally collected by scanning circuit groups resources every 10 or 100 seconds to determine busy/idle states. Measurements are accumulated and read directly in CCS (hundred call seconds).
        (E) Service delay measurements shall provide percentage counts of the calls for a particular service that are delayed beyond a specified interval of time, e.g., calls not receiving dial tone within 3 seconds after call origination.
        (ii) Traffic data shall be stored in electronic storage registers or block of memory consisting of one or more traffic counters for each item to be measured. The registers listed in paragraph (p)(4)(i) of this section shall be associated with the interoffice trunks, switching network and central control equipment in such a manner that the register readings can be used to determine the traffic load and flow to, from and within the system. Two-way trunks shall be metered to indicate inward and outward seizures. The bidder shall indicate what registers are to be supplied and their purpose.
        (iii) The measured data shall be shown on a printout. It should be possible to have local or remote printout, or both. Arrangement shall be made for automatic data printout on command for 15-, 30-, or 60-minute intervals as required, and be arranged for automatic start-stop and in accordance with revenue separation procedures current at the time of contract.
        (iv) All traffic records shall have dates and times and office identification.
        (q) Transmission -- (1) General. The transmission characteristics will be governed by the fact that the switching matrix will be based on digital operation. Unless otherwise stated, the requirements are in terms of analog measurements made from Main Distributing Frame (MDF) to MDF terminals, excluding cabling loss.
        (2) Impedance. For the purpose of this section, the nominal input impedance of analog ports in an end office shall be 900 ohms for 2-wire ports and 600 ohms for 4-wire ports. Where the connecting facility or equipment is other than this impedance, suitable impedance matching shall be provided by the bidder when specified by the owner.
        (3) Insertion loss. The insertion loss in both directions of transmission at 1004 Hz shall meet the following requirements when measured with a 0 dBm input signal at 900 ohms (or 600 ohms, when required) at a temperature of 77F 1B 9F (25C 1B 5C).
        (i) Trunk-to-trunk or trunk-to-line. The loss shall be set between 0 and 0.5 dB for 2-wire to 2-wire, 2-wire to 4-wire, or 4-wire to 4-wire voice frequency connections.
        (ii) Line-to-line. The loss shall be set between 0 and 2 dB.
        (iii) Direct digital interface. On a direct digital interface, the loss through the office shall be adjusted to the proper level in the receive side.
        (iv) Stability. The long-term allowable variation in loss through the office shall be 1B 0.5 dB from the loss specified by the bidder.
        (4) Frequency response (loss relative to 1004 hz) shall meet the following requirements.
(TABLE START)
        (i) Trunk-to-trunk.
@h1 @h2Frequency (Hz)
@h1Loss at 0 dBm0 Input\1\@h22-Wire to 2-Wire@h24-Wire to 4-Wire
        60  .... 20 dB Min.\2\  .... 16 dB Min.\2\
        200  .... 0 to 5 dB  .... 0 to 3 dB
        300 - 3000  .... 0.5 dB to 1 dB  .... 0.3 to +0.3 dB
        3300  .... 1.5 dB Max.  .... 1.5 dB Max.
        3400  .... 0 to 3 dB  .... 0 to 3 dB
Footnote: \1\() means less loss and (+) means more loss.
Footnote: \2\Transmit End
(TABLE END)
(TABLE START)
        (ii) Line-to-line.
@h1Frequency (Hz)
@h1Loss at 0 dBm0 Input\1\
        60  .... 20 dB Min.\2\
        300  .... 1 to +3 dB
        600 - 2400  .... 1B1 dB
        3200  .... 1 to +3 dB
Footnote: \1\() means less loss and (+) means more loss.
Footnote: \2\Transmit End
(TABLE END)
        (iii) Trunk-to-line. The trunk-to-line frequency response requirements shall be a compromise between those values specified in paragraphs (q)(4)(i) and (q)(4)(ii) of this section.
        (5) Overload level. The overload level at 900 ohm impedance shall be +3 dBm0.
        (6) Gain tracking (linearity) shall meet the following
(TABLE START)requirements.
@h1Input Signal Level\1\
@h1Maximum Gain Deviation
        +3 to 37 dBm0  .... 1B0.5 dB
        37 to 50 dBm0  .... 1B1 dB
Footnote: \1\1004 Hz reference at 0 dBm0.
(TABLE END)
        (7) Return loss. (i) The specified return loss values are determined by the service and type of port at the measuring (near) end. Two-wire ports are measured (near end) at 900 ohms in series with 2.16 microfarads and 4-wire ports are measured at 600 ohms resistive.
        (ii) Far end test terminations shall be as follows:
        (A) Loaded line circuit -- 1650 ohms in parallel with the series combination of .005 microfarads and 100 ohms;
        (B) Nonloaded line circuit -- 800 ohms in parallel with the series combination of .05 microfarads and 100 ohms;
        (C) Special service line circuit including electronic lines and carrier lines -- 900 ohms in series with 2.16 microfarads;
        (D) Two-wire trunk -- 900 ohms in series with 2.16 microfarads; and
        (E) Four-wire trunk -- 600 ohms.
        (iii) For trunk-to-trunk (2-wire or 4-wire) connections the echo return loss (ERL) shall be 27 dB, minimum and the singing return loss (SRL) shall be 20 dB, minimum low and 23 dB, minimum high.
        (iv) For trunk-to-line (2-wire or 4-wire) connections the ERL shall be 24 dB, minimum and the SRL shall be 17 dB, minimum low and 20 dB, minimum high.
        (v) For line-to-line or line-to-trunk (2-wire or 4-wire) connections the ERL shall be 18 dB, minimum and the SRL shall be 12 dB, minimum low and 15 dB, minimum high.
        (8) Longitudinal balance. The minimum longitudinal balance, with dc loop currents of 20 to 70 mA, shall be 60 dB at all frequencies between 60 and 2000 Hz, 55 dB at 2700 Hz and 50 dB at 3400 Hz. The method of measurement shall be as specified in the IEEE Std 455 - 1985, IEEE Standard Test Procedure for Measuring Longitudinal Balance of Telephone Equipment Operating in the Voice Band. Source voltage level shall be 10 volts root-mean-square (rms).
        (9) 60 hz longitudinal current immunity. Under test conditions with 60 Hz, the system noise shall be no greater than 23 dBrnC0 as measured using the configuration in Figure 1.
Figure 1 -- Measuring the Effects of Low Frequency Induction
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11030 l 11125 11129 s m11092 11079 l 11142 11129 s m11092 11096 l 11175 11129 s m11092 11112 l 11274 11129 s m11357 11112 l 11307 11129 s m11357 11096 l 11324 11129 s m11357 11079 l 11340 11129 s m11357 11030 l 11208 10798 s m11175 10782 l 11208 10815 s m11191 10782 l 11241 10815 s m11258 10782 l 11241 10798 s m11274 10782 l 11473 11013 s m11473 10782 l 11489 10997 s m11489 10798 l 11423 11013 s m11506 11013 l 11506 10782 l 11622 10980 s m11622 10997 l 11605 10997 l 11605 10964 l 11638 10964 l 11638 10997 l 11622 11013 l 11589 11013 l 11555 10997 l 11522 10964 l 11506 10914 l 11423 10782 s m11555 10782 l 11440 11013 s m11473 10997 l 11456 11013 s m11473 10980 l 11473 10798 s m11440 10782 l 11473 10815 s m11456 10782 l 11506 10815 s m11522 10782 l 11506 10798 s m11539 10782 l 11754 10964 s m11754 10980 l 11770 10980 l 11770 10947 l 11737 10947 l 11737 10980 l 11754 10997 l 11787 11013 l 11853 11013 l 11886 10997 l 11903 10980 l 11919 10947 l 11919 10831 l 11936 10798 l 11952 10782 l 11886 10980 s m11903 10947 l 11903 10831 l 11919 10798 l 11853 11013 s m11870 10997 l 11886 10964 l 11886 10831 l 11903 10798 l 11952 10782 l 11969 10782 l 11886 10930 s m11870 10914 l 11787 10897 l 11737 10881 l 11721 10848 l 11721 10831 l 11737 10798 l 11787 10782 l 11836 10782 l 11870 10798 l 11886 10831 l 11754 10881 s m11737 10848 l 11737 10831 l 11754 10798 l 11870 10914 s m11803 10897 l 11770 10881 l 11754 10848 l 11754 10831 l 11770 10798 l 11787 10782 l 12085 11013 s m12085 10782 l 12101 10997 s m12101 10798 l 12035 11013 s m12118 11013 l 12118 10782 l 12118 10947 s m12134 10980 l 12151 10997 l 12184 11013 l 12234 11013 l 12267 10997 l 12283 10980 l 12300 10930 l 12300 10782 l 12267 10980 s m12283 10930 l 12283 10798 l 12234 11013 s m12250 10997 l 12267 10947 l 12267 10782 l 12035 10782 s m12167 10782 l 12217 10782 s m12349 10782 l 12052 11013 s m12085 10997 l 12068 11013 s m12085 10980 l 12085 10798 s m12052 10782 l 12085 10815 s m12068 10782 l 12118 10815 s m12134 10782 l 12118 10798 s m12151 10782 l 12267 10798 s m12234 10782 l 12267 10815 s m12250 10782 l 12300 10815 s m12316 10782 l 12300 10798 s m12333 10782 l 12598 10980 s m12615 11013 l 12615 10947 l 12598 10980 l 12582 10997 l 12548 11013 l 12482 11013 l 12449 10997 l 12433 10980 l 12433 10947 l 12449 10914 l 12482 10897 l 12565 10881 l 12598 10864 l 12615 10815 l 12449 10997 s m12433 10947 l 12449 10930 s m12482 10914 l 12565 10897 l 12598 10881 l 12615 10864 s m12598 10798 l 12433 10980 s m12449 10947 l 12482 10930 l 12565 10914 l 12598 10897 l 12615 10864 l 12615 10815 l 12598 10798 l 12565 10782 l 12499 10782 l 12466 10798 l 12449 10815 l 12433 10848 l 12433 10782 l 12449 10815 l 12747 11013 s m12747 10782 l 12763 10997 s m12763 10798 l 12697 11013 s m12780 11013 l 12780 10782 l 12780 10947 s m12796 10980 l 12813 10997 l 12846 11013 l 12896 11013 l 12929 10997 l 12945 10980 l 12962 10930 l 12962 10782 l 12929 10980 s m12945 10930 l 12945 10798 l 12896 11013 s m12912 10997 l 12929 10947 l 12929 10782 l 12962 10947 s m12978 10980 l 12995 10997 l 13028 11013 l 13078 11013 l 13111 10997 l 13127 10980 l 13144 10930 l 13144 10782 l 13111 10980 s m13127 10930 l 13127 10798 l 13078 11013 s m13094 10997 l 13111 10947 l 13111 10782 l 12697 10782 s m12829 10782 l 12879 10782 s m13011 10782 l 13061 10782 s m13193 10782 l 12714 11013 s m12747 10997 l 12730 11013 s m12747 10980 l 12747 10798 s m12714 10782 l 12747 10815 s m12730 10782 l 12780 10815 s m12796 10782 l 12780 10798 s m12813 10782 l 12929 10798 s m12896 10782 l 12929 10815 s m12912 10782 l 12962 10815 s m12978 10782 l 12962 10798 s m12995 10782 l 13111 10798 s m13078 10782 l 13111 10815 s m13094 10782 l 13144 10815 s m13160 10782 l 13144 10798 s m13177 10782 l 13310 11129 s m13310 11096 l 13343 11096 l 13343 11129 l 13310 11129 l 13326 11129 s m13326 11096 l 13310 11112 s m13343 11112 l 13310 11013 s m13310 10782 l 13326 10997 s m13326 10798 l 13260 11013 s m13343 11013 l 13343 10782 l 13260 10782 s m13392 10782 l 13277 11013 s m13310 10997 l 13293 11013 s m13310 10980 l 13310 10798 s m13277 10782 l 13310 10815 s m13293 10782 l 13343 10815 s m13359 10782 l 13343 10798 s m13376 10782 l 13641 10980 s m13658 11013 l 13658 10947 l 13641 10980 l 13625 10997 l 13591 11013 l 13525 11013 l 13492 10997 l 13476 10980 l 13476 10947 l 13492 10914 l 13525 10897 l 13608 10881 l 13641 10864 l 13658 10815 l 13492 10997 s m13476 10947 l 13492 10930 s m13525 10914 l 13608 10897 l 13641 10881 l 13658 10864 s m13641 10798 l 13476 10980 s m13492 10947 l 13525 10930 l 13608 10914 l 13641 10897 l 13658 10864 l 13658 10815 l 13641 10798 l 13608 10782 l 13542 10782 l 13509 10798 l 13492 10815 l 13476 10848 l 13476 10782 l 13492 10815 l 13922 10980 s m13939 11013 l 13939 10947 l 13922 10980 l 13906 10997 l 13872 11013 l 13806 11013 l 13773 10997 l 13757 10980 l 13757 10947 l 13773 10914 l 13806 10897 l 13889 10881 l 13922 10864 l 13939 10815 l 13773 10997 s m13757 10947 l 13773 10930 s m13806 10914 l 13889 10897 l 13922 10881 l 13939 10864 s m13922 10798 l 13757 10980 s m13773 10947 l 13806 10930 l 13889 10914 l 13922 10897 l 13939 10864 l 13939 10815 l 13922 10798 l 13889 10782 l 13823 10782 l 13790 10798 l 13773 10815 l 13757 10848 l 13757 10782 l 13773 10815 l 14072 11129 s m14072 11096 l 14105 11096 l 14105 11129 l 14072 11129 l 14088 11129 s m14088 11096 l 14072 11112 s m14105 11112 l 14072 11013 s m14072 10782 l 14088 10997 s m14088 10798 l 14022 11013 s m14105 11013 l 14105 10782 l 14022 10782 s m14154 10782 l 14039 11013 s m14072 10997 l 14055 11013 s m14072 10980 l 14072 10798 s m14039 10782 l 14072 10815 s m14055 10782 l 14105 10815 s m14121 10782 l 14105 10798 s m14138 10782 l 14337 11013 s m14287 10997 l 14254 10964 l 14238 10914 l 14238 10881 l 14254 10831 l 14287 10798 l 14337 10782 l 14370 10782 l 14420 10798 l 14453 10831 l 14469 10881 l 14469 10914 l 14453 10964 l 14420 10997 l 14370 11013 l 14337 11013 l 14271 10964 s m14254 10930 l 14254 10864 l 14271 10831 l 14436 10831 s m14453 10864 l 14453 10930 l 14436 10964 l 14337 11013 s m14304 10997 l 14287 10980 l 14271 10930 l 14271 10864 l 14287 10815 l 14304 10798 l 14337 10782 l 14370 10782 s m14403 10798 l 14420 10815 l 14436 10864 l 14436 10930 l 14420 10980 l 14403 10997 l 14370 11013 l 14601 11013 s m14601 10782 l 14617 10997 s m14617 10798 l 14551 11013 s m14634 11013 l 14634 10782 l 14634 10947 s m14650 10980 l 14667 10997 l 14700 11013 l 14750 11013 l 14783 10997 l 14799 10980 l 14816 10930 l 14816 10782 l 14783 10980 s m14799 10930 l 14799 10798 l 14750 11013 s m14766 10997 l 14783 10947 l 14783 10782 l 14551 10782 s m14683 10782 l 14733 10782 s m14865 10782 l 14568 11013 s m14601 10997 l 14584 11013 s m14601 10980 l 14601 10798 s m14568 10782 l 14601 10815 s m14584 10782 l 14634 10815 s m14650 10782 l 14634 10798 s m14667 10782 l 14783 10798 s m14750 10782 l 14783 10815 s m14766 10782 l 14816 10815 s m14832 10782 l 14816 10798 s m14849 10782 l 11247 10385 s m11247 10286 l 11363 10385 s m11363 10038 l 11379 10368 s m11379 10054 l 11396 10385 s m11396 10038 l 11512 10385 s m11512 10286 l 11247 10385 s m11512 10385 l 11313 10038 s m11446 10038 l 11264 10385 s m11247 10286 l 11280 10385 s m11247 10335 l 11297 10385 s m11247 10352 l 11330 10385 s m11247 10368 l 11429 10385 s m11512 10368 l 11462 10385 s m11512 10352 l 11479 10385 s m11512 10335 l 11495 10385 s m11512 10286 l 11363 10054 s m11330 10038 l 11363 10071 s m11346 10038 l 11396 10071 s m11413 10038 l 11396 10054 s m11429 10038 l 11627 10170 s m11809 10170 l 11809 10203 l 11792 10236 l 11776 10253 l 11726 10269 l 11693 10269 l 11643 10253 l 11610 10220 l 11594 10170 l 11594 10137 l 11610 10087 l 11643 10054 l 11693 10038 l 11726 10038 l 11776 10054 l 11809 10087 l 11792 10186 s m11792 10203 l 11776 10236 l 11627 10220 s m11610 10186 l 11610 10120 l 11627 10087 l 11776 10170 s m11776 10220 l 11759 10253 l 11726 10269 l 11693 10269 s m11660 10253 l 11643 10236 l 11627 10186 l 11627 10120 l 11643 10071 l 11660 10054 l 11693 10038 l 12074 10236 s m12091 10269 l 12091 10203 l 12074 10236 l 12058 10253 l 12024 10269 l 11958 10269 l 11925 10253 l 11909 10236 l 11909 10203 l 11925 10170 l 11958 10153 l 12041 10137 l 12074 10120 l 12091 10071 l 11925 10253 s m11909 10203 l 11925 10186 s m11958 10170 l 12041 10153 l 12074 10137 l 12091 10120 s m12074 10054 l 11909 10236 s m11925 10203 l 11958 10186 l 12041 10170 l 12074 10153 l 12091 10120 l 12091 10071 l 12074 10054 l 12041 10038 l 11975 10038 l 11942 10054 l 11925 10071 l 11909 10104 l 11909 10038 l 11925 10071 l 12223 10352 s m12223 10120 l 12239 10071 l 12256 10054 l 12289 10038 l 12322 10038 l 12355 10054 l 12372 10087 l 12239 10352 s m12239 10104 l 12256 10071 l 12223 10352 s m12256 10385 l 12256 10104 l 12272 10054 l 12289 10038 l 12173 10269 s m12322 10269 l 12918 10335 s m12934 10385 l 12934 10286 l 12918 10335 l 12885 10368 l 12835 10385 l 12785 10385 l 12736 10368 l 12703 10335 l 12703 10286 l 12719 10253 l 12769 10220 l 12868 10186 l 12901 10170 l 12918 10137 l 12918 10087 l 12901 10054 l 12719 10286 s m12736 10253 l 12769 10236 l 12868 10203 l 12901 10186 l 12918 10153 l 12736 10368 s m12719 10335 l 12719 10302 l 12736 10269 l 12769 10253 l 12868 10220 l 12918 10186 l 12934 10153 l 12934 10104 l 12918 10071 l 12901 10054 l 12852 10038 l 12802 10038 l 12752 10054 l 12719 10087 l 12703 10137 l 12703 10038 l 12719 10087 l 13066 10170 s m13248 10170 l 13248 10203 l 13231 10236 l 13215 10253 l 13165 10269 l 13132 10269 l 13082 10253 l 13049 10220 l 13033 10170 l 13033 10137 l 13049 10087 l 13082 10054 l 13132 10038 l 13165 10038 l 13215 10054 l 13248 10087 l 13231 10186 s m13231 10203 l 13215 10236 l 13066 10220 s m13049 10186 l 13049 10120 l 13066 10087 l 13215 10170 s m13215 10220 l 13198 10253 l 13165 10269 l 13132 10269 s m13099 10253 l 13082 10236 l 13066 10186 l 13066 10120 l 13082 10071 l 13099 10054 l 13132 10038 l 13381 10352 s m13381 10120 l 13397 10071 l 13414 10054 l 13447 10038 l 13480 10038 l 13513 10054 l 13530 10087 l 13397 10352 s m13397 10104 l 13414 10071 l 13381 10352 s m13414 10385 l 13414 10104 l 13430 10054 l 13447 10038 l 13331 10269 s m13480 10269 l 11321 9640 s m11321 9309 l 11321 9640 s m11552 9293 l 11337 9640 s m11536 9342 l 11354 9640 s m11552 9342 l 11552 9623 s m11552 9293 l 11271 9640 s m11354 9640 l 11503 9640 s m11602 9640 l 11271 9293 s m11370 9293 l 11288 9640 s m11321 9623 l 11519 9640 s m11552 9623 l 11585 9640 s m11552 9623 l 11321 9309 s m11288 9293 l 11321 9309 s m11354 9293 l 11784 9524 s m11734 9508 l 11701 9475 l 11685 9425 l 11685 9392 l 11701 9342 l 11734 9309 l 11784 9293 l 11817 9293 l 11867 9309 l 11900 9342 l 11916 9392 l 11916 9425 l 11900 9475 l 11867 9508 l 11817 9524 l 11784 9524 l 11718 9475 s m11701 9441 l 11701 9375 l 11718 9342 l 11883 9342 s m11900 9375 l 11900 9441 l 11883 9475 l 11784 9524 s m11751 9508 l 11734 9491 l 11718 9441 l 11718 9375 l 11734 9326 l 11751 9309 l 11784 9293 l 11817 9293 s m11850 9309 l 11867 9326 l 11883 9375 l 11883 9441 l 11867 9491 l 11850 9508 l 11817 9524 l 12049 9607 s m12049 9375 l 12065 9326 l 12082 9309 l 12115 9293 l 12148 9293 l 12181 9309 l 12198 9342 l 12065 9607 s m12065 9359 l 12082 9326 l 12049 9607 s m12082 9640 l 12082 9359 l 12098 9309 l 12115 9293 l 11999 9524 s m12148 9524 l 12297 9425 s m12479 9425 l 12479 9458 l 12462 9491 l 12446 9508 l 12396 9524 l 12363 9524 l 12313 9508 l 12280 9475 l 12264 9425 l 12264 9392 l 12280 9342 l 12313 9309 l 12363 9293 l 12396 9293 l 12446 9309 l 12479 9342 l 12462 9441 s m12462 9458 l 12446 9491 l 12297 9475 s m12280 9441 l 12280 9375 l 12297 9342 l 12446 9425 s m12446 9475 l 12429 9508 l 12396 9524 l 12363 9524 s m12330 9508 l 12313 9491 l 12297 9441 l 12297 9375 l 12313 9326 l 12330 9309 l 12363 9293 l 12941 9607 s m12941 9293 l 12957 9607 s m12957 9309 l 12974 9640 s m12974 9293 l 12974 9640 s m12924 9590 l 12891 9574 l 12875 9293 s m13040 9293 l 12941 9309 s m12908 9293 l 12941 9326 s m12924 9293 l 12974 9326 s m12991 9293 l 12974 9309 s m13007 9293 l 10107 4740 s m10074 4575 l 10107 4608 l 10156 4624 l 10206 4624 l 10256 4608 l 10289 4575 l 10305 4525 l 10305 4492 l 10289 4442 l 10256 4409 l 10206 4393 l 10156 4393 l 10107 4409 l 10090 4426 l 10074 4459 l 10074 4475 l 10090 4492 l 10107 4492 l 10123 4475 l 10123 4459 l 10107 4442 l 10090 4442 l 10272 4575 s m10289 4541 l 10289 4475 l 10272 4442 l 10206 4624 s m10239 4608 l 10256 4591 l 10272 4541 l 10272 4475 l 10256 4426 l 10239 4409 l 10206 4393 l 10090 4475 s m10090 4459 l 10107 4459 l 10107 4475 l 10090 4475 l 10107 4740 s m10272 4740 l 10107 4723 s m10239 4723 l 10107 4707 s m10173 4707 l 10239 4723 l 10272 4740 l 10504 4740 s m10454 4723 l 10421 4674 l 10405 4591 l 10405 4541 l 10421 4459 l 10454 4409 l 10504 4393 l 10537 4393 l 10587 4409 l 10620 4459 l 10636 4541 l 10636 4591 l 10620 4674 l 10587 4723 l 10537 4740 l 10504 4740 l 10454 4707 s m10438 4674 l 10421 4608 l 10421 4525 l 10438 4459 l 10454 4426 l 10587 4426 s m10603 4459 l 10620 4525 l 10620 4608 l 10603 4674 l 10587 4707 l 10504 4740 s m10471 4723 l 10454 4690 l 10438 4608 l 10438 4525 l 10454 4442 l 10471 4409 l 10504 4393 l 10537 4393 s m10570 4409 l 10587 4442 l 10603 4525 l 10603 4608 l 10587 4690 l 10570 4723 l 10537 4740 l 10835 4740 s m10785 4723 l 10752 4674 l 10736 4591 l 10736 4541 l 10752 4459 l 10785 4409 l 10835 4393 l 10868 4393 l 10918 4409 l 10951 4459 l 10967 4541 l 10967 4591 l 10951 4674 l 10918 4723 l 10868 4740 l 10835 4740 l 10785 4707 s m10769 4674 l 10752 4608 l 10752 4525 l 10769 4459 l 10785 4426 l 10918 4426 s m10934 4459 l 10951 4525 l 10951 4608 l 10934 4674 l 10918 4707 l 10835 4740 s m10802 4723 l 10785 4690 l 10769 4608 l 10769 4525 l 10785 4442 l 10802 4409 l 10835 4393 l 10868 4393 s m10901 4409 l 10918 4442 l 10934 4525 l 10934 4608 l 10918 4690 l 10901 4723 l 10868 4740 l 11446 4740 s m11397 4723 l 11364 4690 l 11347 4657 l 11331 4591 l 11331 4541 l 11347 4475 l 11364 4442 l 11397 4409 l 11446 4393 l 11480 4393 l 11529 4409 l 11562 4442 l 11579 4475 l 11595 4541 l 11595 4591 l 11579 4657 l 11562 4690 l 11529 4723 l 11480 4740 l 11446 4740 l 11380 4690 s m11364 4657 l 11347 4608 l 11347 4525 l 11364 4475 l 11380 4442 l 11546 4442 s m11562 4475 l 11579 4525 l 11579 4608 l 11562 4657 l 11546 4690 l 11446 4740 s m11413 4723 l 11380 4674 l 11364 4608 l 11364 4525 l 11380 4459 l 11413 4409 l 11446 4393 l 11480 4393 s m11513 4409 l 11546 4459 l 11562 4525 l 11562 4608 l 11546 4674 l 11513 4723 l 11480 4740 l 11728 4740 s m11728 4393 l 11744 4723 s m11744 4409 l 11678 4740 s m11761 4740 l 11761 4393 l 11761 4558 s m11777 4591 l 11794 4608 l 11827 4624 l 11877 4624 l 11910 4608 l 11926 4591 l 11943 4541 l 11943 4393 l 11910 4591 s m11926 4541 l 11926 4409 l 11877 4624 s m11893 4608 l 11910 4558 l 11910 4393 l 11678 4393 s m11810 4393 l 11860 4393 s m11992 4393 l 11695 4740 s m11728 4723 l 11711 4740 s m11728 4707 l 11728 4409 s m11695 4393 l 11728 4426 s m11711 4393 l 11761 4426 s m11777 4393 l 11761 4409 s m11794 4393 l 11910 4409 s m11877 4393 l 11910 4426 s m11893 4393 l 11943 4426 s m11959 4393 l 11943 4409 s m11976 4393 l 12109 4624 s m12109 4393 l 12125 4608 s m12125 4409 l 12059 4624 s m12142 4624 l 12142 4393 l 12142 4558 s m12158 4591 l 12175 4608 l 12208 4624 l 12258 4624 l 12291 4608 l 12307 4591 l 12324 4541 l 12324 4393 l 12291 4591 s m12307 4541 l 12307 4409 l 12258 4624 s m12274 4608 l 12291 4558 l 12291 4393 l 12324 4558 s m12340 4591 l 12357 4608 l 12390 4624 l 12440 4624 l 12473 4608 l 12489 4591 l 12506 4541 l 12506 4393 l 12473 4591 s m12489 4541 l 12489 4409 l 12440 4624 s m12456 4608 l 12473 4558 l 12473 4393 l 12059 4393 s m12191 4393 l 12241 4393 s m12373 4393 l 12423 4393 s m12555 4393 l 12076 4624 s m12109 4608 l 12092 4624 s m12109 4591 l 12109 4409 s m12076 4393 l 12109 4426 s m12092 4393 l 12142 4426 s m12158 4393 l 12142 4409 s m12175 4393 l 12291 4409 s m12258 4393 l 12291 4426 s m12274 4393 l 12324 4426 s m12340 4393 l 12324 4409 s m12357 4393 l 12473 4409 s m12440 4393 l 12473 4426 s m12456 4393 l 12506 4426 s m12522 4393 l 12506 4409 s m12539 4393 l 12803 4591 s m12820 4624 l 12820 4558 l 12803 4591 l 12787 4608 l 12753 4624 l 12687 4624 l 12654 4608 l 12638 4591 l 12638 4558 l 12654 4525 l 12687 4508 l 12770 4492 l 12803 4475 l 12820 4426 l 12654 4608 s m12638 4558 l 12654 4541 s m12687 4525 l 12770 4508 l 12803 4492 l 12820 4475 s m12803 4409 l 12638 4591 s m12654 4558 l 12687 4541 l 12770 4525 l 12803 4508 l 12820 4475 l 12820 4426 l 12803 4409 l 12770 4393 l 12704 4393 l 12671 4409 l 12654 4426 l 12638 4459 l 12638 4393 l 12654 4426 l 12986 4409 s m12969 4393 l 12953 4393 l 12936 4409 l 12936 4426 l 12953 4442 l 12969 4442 l 12986 4426 l 12986 4376 l 12969 4343 l 12936 4326 l 12953 4426 s m12953 4409 l 12969 4409 l 12969 4426 l 12953 4426 l 12969 4393 s m12986 4376 l 12986 4409 s m12969 4343 l 13399 4740 s m13366 4575 l 13399 4608 l 13448 4624 l 13498 4624 l 13548 4608 l 13581 4575 l 13597 4525 l 13597 4492 l 13581 4442 l 13548 4409 l 13498 4393 l 13448 4393 l 13399 4409 l 13382 4426 l 13366 4459 l 13366 4475 l 13382 4492 l 13399 4492 l 13415 4475 l 13415 4459 l 13399 4442 l 13382 4442 l 13564 4575 s m13581 4541 l 13581 4475 l 13564 4442 l 13498 4624 s m13531 4608 l 13548 4591 l 13564 4541 l 13564 4475 l 13548 4426 l 13531 4409 l 13498 4393 l 13382 4475 s m13382 4459 l 13399 4459 l 13399 4475 l 13382 4475 l 13399 4740 s m13564 4740 l 13399 4723 s m13531 4723 l 13399 4707 s m13465 4707 l 13531 4723 l 13564 4740 l 13977 4624 s m14043 4393 l 13994 4624 s m14043 4442 l 14010 4624 s m14060 4442 l 14110 4624 s m14060 4442 l 14043 4393 l 14110 4624 s m14176 4393 l 14126 4624 s m14176 4442 l 14110 4624 s m14143 4624 l 14192 4442 l 14242 4608 s m14192 4442 l 14176 4393 l 13928 4624 s m14060 4624 l 14192 4624 s m14292 4624 l 13944 4624 s m13994 4608 l 14043 4624 s m14010 4608 l 14209 4624 s m14242 4608 l 14275 4624 s m14242 4608 l 14391 4575 s m14391 4591 l 14407 4591 l 14407 4558 l 14374 4558 l 14374 4591 l 14391 4608 l 14424 4624 l 14490 4624 l 14523 4608 l 14540 4591 l 14556 4558 l 14556 4442 l 14573 4409 l 14589 4393 l 14523 4591 s m14540 4558 l 14540 4442 l 14556 4409 l 14490 4624 s m14507 4608 l 14523 4575 l 14523 4442 l 14540 4409 l 14589 4393 l 14606 4393 l 14523 4541 s m14507 4525 l 14424 4508 l 14374 4492 l 14358 4459 l 14358 4442 l 14374 4409 l 14424 4393 l 14473 4393 l 14507 4409 l 14523 4442 l 14391 4492 s m14374 4459 l 14374 4442 l 14391 4409 l 14507 4525 s m14440 4508 l 14407 4492 l 14391 4459 l 14391 4442 l 14407 4409 l 14424 4393 l 14721 4707 s m14721 4475 l 14737 4426 l 14754 4409 l 14787 4393 l 14820 4393 l 14853 4409 l 14870 4442 l 14737 4707 s m14737 4459 l 14754 4426 l 14721 4707 s m14754 4740 l 14754 4459 l 14770 4409 l 14787 4393 l 14671 4624 s m14820 4624 l 14969 4707 s m14969 4475 l 14985 4426 l 15002 4409 l 15035 4393 l 15068 4393 l 15101 4409 l 15118 4442 l 14985 4707 s m14985 4459 l 15002 4426 l 14969 4707 s m15002 4740 l 15002 4459 l 15018 4409 l 15035 4393 l 14919 4624 s m15068 4624 l 400 5391 s m799 5990 l 1 5791 l 1198 7188 l s end restore%%Trailer@!_
Notes:
1. 900 ohm termination, C-message weighting, hold coil off
2. SNC Noise Choke 35 W, or equivalent
3. Test at 0.020 Adc and 0.070 Adc
4. 2 1B 0.001 microfarad, 150 Vdc
        (10) Steady noise (idle channel at 900 ohms impedance) measured on a terminated call shall be 23 dBrnC0 maximum and average 18 dBrnC0 or less. The 3K Hz Flat noise should be less than 35 dBrnC0 as an objective.
        (11) Impulse noise. The central office switching equipment shall be capable of meeting an impulse noise limit of not more than five counts exceeding 54 dBrnC0 voice band weighted in a 5-minute period on six such measurements made during the busy hour. A Northeast Electronics Company TTS 4002 Impulse Noise Counter, Wilcom T194C, Hewlett Packard 4945, or equivalent, should be used for the measurements. The measurement shall be made by establishing a normal connection from the noise counter through the switching equipment in its off-hook condition to a quiet termination of 900 ohms impedance. Office battery and signaling circuit wiring shall be suitably segregated from voice and carrier circuit wiring, and frame talking battery filters provided, if and as required, in order to meet these impulse noise limits.
        (12) Crosstalk coupling. Worst case equal level crosstalk is to be 75 dB minimum in the range 200 - 3400 Hz. This is to be measured between any two paths through the system connecting a 0 dBm0 level tone to the disturbing pair.
        (13) Quantizing distortion. (i) The switching system shall
(TABLE START)meet the following requirements.
@h1Input Level (dBm0) 1004 or 1020 Hz
@h1Minimum Signal to Distortion with C-Message Weighting
        0 to 30  .... 33 dB
         30 to 40  .... 27 dB
         40 to 45  .... 22 dB
(TABLE END)
        (ii) Due to the possible loss of the least significant bit on direct digital connections, a signal to distortion degradation of up to 2 dB may be allowed where adequately justified by the bidder.
        (14) Absolute delay. The absolute one-way delay through the switching system, excluding delays associated with RST switching, shall not exceed 1000 microseconds analog-to-analog measured at 1800 Hz.
        (15) Envelope delay distortion. On any properly established connection, the envelope delay distortion shall not exceed the following
(TABLE START)limits.
@h1Frequency Range (Hz)
@h1Microseconds
        1000 to 2600  .... 190
        800 to 2800  .... 350
        600 to 3000  .... 500
        400 to 3200  .... 700
(TABLE END)
        (16) Digital error rate. The digital switching system shall not introduce an error into digital connections which is worse than one error in 108 bits averaged over a 5-minute period.
        (17) Battery noise. Noise across battery at power board distribution bus terminals shall not exceed 35 dBrnC during the busy hour.
        (18) Radio and television interference. The central office switching equipment shall be designed and installed so that radiation of high frequency noise will be limited so as not to interfere with radio and television receivers.
        (r) Timing intervals -- (1) Type of equipment required. The equipment for providing the specified timing intervals shall be solid-state.
        (2) Tolerance. Where a range of time is specified as minimum and maximum, the lower limits shall be considered as controlling and the variation between this minimum and the actual maximum shall be kept as small as practicable. In no case shall the quoted upper limit be exceeded.
        (3) Permanent signal timing. Lockout shall occur after an interval of 20 to 30 seconds after receipt of dial tone if a ``permanent'' condition occurs prior to the transmission of dial pulses or pushbutton dialing signals. This interval may be reduced appreciably during periods of heavy traffic.
        (4) Partial dial timing. Partial dial timing shall be within 15 to 37 seconds. This timing may be reduced appreciably during periods of heavy traffic.
        (5) Charge delay timing. Charge delay timing shall be within 2 seconds.
        (6) ``Don't answer'' disconnect timing. On revertive calls, a ``don't answer'' disconnect feature shall be provided which shall operate within a period of 2 to 4 minutes should the called party not answer.
        (7) Called party disconnect timing. Timed disconnect of a terminating path under control of the called party shall be 10 to 32 seconds.
        (8) Timing intervals for signals involved in distance dialing. Timing intervals shall be provided to meet the requirements for distance dialing equipment, which have been established in Bellcore document SR-TSV-002275, BOC Notes on the LEC Networks -- 1990. Some of the more important times which this document specifies are for:
        (i) Disconnect signal;
        (ii) Wink signal;
        (iii) Start dialing signal;
        (iv) Pulse delay signal;
        (v) Go signal;
        (vi) Digit timing; and
        (vii) Sender, register, and link attachment timing.
        (s) Power requirements and equipment -- (1) Operating voltage. The nominal operating voltage of the central office shall be 48 volts dc, provided by a battery with the positive side tied to system ground.
        (2) Batteries. (i) When battery cells of the lead antimony type are specified, the pasted plate type shall be considered adequate.
        (ii) When lead calcium cells are specified, no cell shall differ from the average voltage of the string of fully charged cells by more than 1B0.03 volt when measured at a charging rate in amperes equivalent to 10 percent of the ampere hour capacity of the cells. Similarly, when cells are fully charged and floating between 2.30 and 2.33 volts per cell, the cell voltage of any cell in a given string shall not differ more than 1B0.03 volt from the average. These requirements are for test purposes only and do not apply to operating conditions.
        (iii) Voltage readings shall be corrected by a temperature coefficient of 0.0033 volt per degree F (0.006 per degree C), whenever temperature variations exist between cells in a given string. This correction factor shall also be applied when comparing cell voltages taken at different times and at different temperatures. The correction factor shall be added to the measured voltage when the temperature is above 77_F (25_C) and subtracted when the temperature is below 77_F (25_C).
        (iv) The specific gravity readings of lead antimony cells at full charge shall be 1.210 1B .010 at 77_F (25_C) at maximum electrolyte height.
        (v) When counter cells are supplied by the bidder, they shall be the dry counter electromotive force (CEMF) type.
        (vi) When lead antimony batteries are specified, they shall be designed to last a minimum of 10 years when maintained on a full float operation between 2.15 and 2.17 volts per cell. When lead calcium batteries are specified, they shall be designed to last a minimum of 20 years when maintained on full float operation between 2.17 and 2.25 volts per cell. The battery shall be clearly designated as ``antimony'' or ``calcium'' by means of stencils, decals or other devices.
        (vii) Each battery cell shall be equipped with an explosion control device.
        (viii) The battery size shall be calculated in accordance with standard procedures. The battery in no case shall have a reserve capacity in ampere hours less than four times the current capacity of the largest charger.
        (3) Charging equipment. (i) Charging shall be on a full float basis. The rectifiers shall be of the full wave, self-regulating, constant voltage, solid-state type and shall be capable of being turned on and off manually.
        (ii) When charging batteries, the voltage at the battery terminals shall be adjustable and shall be set at the value recommended for the particular battery being charged, providing it is not above the maximum operating voltage of the switching system equipment. The voltage shall not vary more than plus or minus 0.02 volt per cell between 10 percent load and 100 percent load. Between 3 percent and 10 percent load, the output voltage shall not vary more than plus or minus 0.04 volt per cell. Beyond full load current, the output voltage shall drop sharply. The output voltage shall be maintained with the line voltage variations of plus or minus 10 percent. Provision shall be made to change the output voltage of the rectifier manually to 2.25 volts per cell to provide an equalization charge on the battery.
        (iii) The charger noise shall not exceed 22 dBrnC when measured with a suitable noise measuring set and under the rated battery capacitance and load conditions as determined in Figure 2.
Figure 2 -- Charger Noise Test
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The manufacturer may elect to eliminate the capacitor C from the measurement.
A. Capacitance in mF = 30,000 mF per ampere-hour per cell. For example, 25 cells at 100 ampere-hour would be equivalent to a capacitance of:
        (30,000 0A 100)/25 = 120,000 mF
B. The value of the resistive load R is determined by the nominal battery voltage in volts divided by the full load rating in amperes. For example, for a 48 volt battery and a full load current of 24 amperes, the load resistance R is 48/24 = 2 ohms of appropriate power handling capacity.
        (iv) The charging equipment shall indicate a failure of charging current, whether due to ac power failure, an internal failure in the charger, or to other circumstances which might cause the output voltage of the charger to drop below the battery voltage. Where a supplementary constant current charger is used, an alarm shall be provided to indicate a failure of the charger.
        (v) Audible noise developed by the charging equipment shall be kept to a minimum. Acoustic noise resulting from operation of the rectifier shall be expressed in terms of dB indicated on a sound level meter conforming to ANSI S1.4 - 1983, Specification for Sound Level Meters, and shall not exceed 65 dB (A-weighting) measured at any point 5 feet (152.4 cm) from any vertical surface of the rectifier.
        (vi) The charging equipment shall be designed so that neither the charger nor the central office switching equipment is subject to damage in case the battery circuit is opened for any value of load within the normal limits.
        (vii) The charging equipment shall have a capacity to meet the requirements of central office size and special requirements of the owner in appendix A of this section.
        (viii) Minimum equipment requirement for chargers is one of the following:
        (A) Two chargers either capable of carrying the full office load as specified in Item 12 of appendix A of this section; or
        (B) Three chargers each capable of carrying half the office load as specified in Item 12 of appendix A of this section.
        (4) Miscellaneous voltage supplies. (i) Any power supply required for voltages other than the primary battery voltage shall be provided by either a solid-state dc-to-dc converter or dc-to-ac inverter, operating from the central office battery or from a separate battery and charger. These power supplies shall meet the noise limit specified for chargers in paragraph (s)(3)(iii) of this section, except the capacitor ``C'' shall be eliminated and the resistive load ``R'' shall be determined by the nominal output voltage in volts divided by the full load current rating in amperes. This requirement does not preclude the use of commercial ac power to operate input/output devices.
        (ii) Power converters required for the purpose of providing various operating voltages to printed circuit boards or similar equipment employing electronic components shall be provided in duplicate with each unit capable of immediately assuming the full operating load upon failure of a unit. An exception to the duplicate power converter requirement permits nonduplicated power converter(s) to be utilized where there is full compliance with the following criteria.
        (A) The failure of any single nonduplicated power converter shall not reduce the grade of service of common control and service circuits to any individual line or trunk by more than 50 percent.
        (B) The failure of any single nonduplicated power converter shall not reduce the traffic carrying capacity of any interoffice trunk group by more than 50 percent.
        (C) In central office switching systems of 400 or more equipped lines, any single nonduplicated power converter failure shall not cause a complete loss of service to more than 100 equipped lines.
        (D) In central office switching systems of less than 400 equipped lines, any single nonduplicated power converter failure shall not cause a complete loss of service to more than 25 percent of the total equipped lines.
        (5) Ringing generators. Ringing generators supplied on an ancillary basis shall be selected from RUS Bulletin 1755I-100, List of Materials Acceptable for Use on Telephone Systems of RUS Borrowers. Regardless of whether the ringing is generated on an ancillary basis or is generated integrally to the switching system, the ringing equipment shall meet the requirements of this section.
        (i) Ringing equipment provisioning. (A) Redundant ringing equipment shall be provided. There shall be automatic transfer to the redundant equipment within the period of one ringing cycle, in case of failure of the equipment in use (either regular or standby). Automatic transfer shall not take place under any other conditions. Manual transfer in each direction shall be provided.
        (B) An exception to the redundant ringing equipment requirement permits nonredundant ringing equipment to be utilized where there is full compliance with the following service criteria.
        (1) In a central office switching system of 400 or more equipped lines, a single nonduplicated ringing source failure shall not cause the complete loss of ringing capability to more than 100 lines.
        (2) In a central office switching system of less than 400 equipped lines, a single nonredundant ringing source failure shall not cause the complete loss of ringing capability to more than 25 percent of the total equipped lines.
        (ii) Output voltage. (A) The ringing generators shall have an output voltage which approximates a sine wave and, as a minimum, shall be suitable for ringing straight-line ringers. Although not a requirement for RUS listing, decimonic, synchromonic, or harmonic ringing may also be specified in appendix A of this section.
        (B) The ringing generator shall obtain its energy from the nominal 48-volt office battery.
        (C) The output of each generator shall have three or more voltage taps or a single tap with associated variable control. Taps or control shall be easily accessible as installed in the field. Software control of ringing generator outputs via I/O devices may be provided in lieu of taps. The taps, or equivalent, shall be designated L, M, and H. The variable control shall have a locking device to prevent accidental readjustment. The outputs at the terminals of the generators with a voltage input of 52.1 volts and rated full resistive load shall be as follows for the ringing frequencies provided:
(TABLE START)
@h1Frequency Range (Hz)
@h1Output Volts rms (Tolerance 3 Volts)@h2L@h2M@h2H
16 2/3 through 20  .... 90  .... 105  .... 120
21 through 30  .... 95  .... 110  .... 120
31 through 42  .... 100  .... 115  .... 130
43 through 54  .... 110  .... 125  .... 140
(TABLE END)
        (D) No voltages in excess of the values in column H of the table in paragraph (s)(5)(ii)(C) of this section shall be provided at the output taps. Additional intermediate and/or lower taps may be provided without restriction.
        (iii) Voltage regulation. (A) The output voltage for resistive, capacitive power factor of 0.8, and inductive power factor of 0.5 loads from no load to full rated output with 52.1 volts input battery shall not vary more than 1B3 percent from the output voltage measured at 1/2 rated output, 1.0 power factor with 52.1 volts dc input applied.
        (B) The output voltage for resistive, capacitive power factor of 0.8, and inductive power factor of 0.5 from no load to full rated output with input battery variations between 48 - 56 volts dc shall not vary more than 1B 10 percent from the output voltage measured at 1/2 rated output and 1.0 power factor with 52.1 volts dc input applied.
        (C) The output voltage for resistive, capacitive power factor of 0.8, and inductive power factor of 0.5 loads from no load to full rated output and with input battery variations between 44 - 56 volts dc shall not vary more than +10/15 percent from the output voltage measured at 1/2 rated output and 1.0 power factor with 52.1 volts dc input applied.
        (iv) Cross ringing. Unwanted voltage caused by harmonic distortion or intermodulation distortion shall not exceed 15 volts rms when measured within 1B5 Hz of any other assigned ringing frequency under any condition of load or input battery specified by paragraph (s)(5)(iii) of this section.
        (v) Frequency stability. At ambient temperature of 70_ 1B5_F (21_ 1B0.3_C), for any combination of capacitive power factor of 0.8, inductive power factor of 0.5, and resistive loads with variations in input battery ranging from 44 to 56 volts, the output frequency shall not vary more than 1B1/3 Hz or 1B1 percent, whichever is less stringent. At temperatures between 15_F (4_C) to 130_F (54_C), and for any combination of resistive load and variations in input battery ranging from 44 - 56 volts, the output frequency shall not vary more than 1B1/3 Hz or 1B1 percent, whichever is less stringent.
        (vi) Self-protection on overloads. The ringing generator equipment shall be capable of withstanding a short circuit across any pair of output terminals for a period of 5 minutes without fuse operation or damage.
        (6) Interrupter equipment. (i) The interrupter shall be an integral part of the switching system and shall be controlled by any call processor or equivalent.
        (ii) The ringing cycle provided by the interrupter equipment shall not exceed 6 seconds in length. The ringing period shall be 2 seconds.
        (7) Power panels. (i) Battery and charger control switches, dc voltmeters, dc ammeters, fuses and circuit breakers, supervisory and timer circuits shall be provided as required. Voltmeters shall be provided as specified by the owner.
        (ii) Portable or panel mounted frequency meters shall be provided as specified by the owner unless the system is equipped to measure actual ringing generator voltage and frequency outputs internally. If the system is equipped to make such measurements and print the results, the bidder is not required to provide a frequency meter.
        (iii) Power panels, cabinets and shelves, and associated wiring shall be designed initially to handle the exchange when it reaches its ultimate capacity as specified by the owner.
        (iv) The power panel shall be of the ``dead front'' type.
        (t) Main distributing frames. (1) The main distributing frame shall provide terminals for terminating all incoming cable pairs. Arresters shall be provided for all incoming cable pairs, or for a smaller number of pairs if specified, provided an acceptable means of temporarily grounding all terminated pairs which are not equipped with arresters is furnished.
        (2) The current carrying capacity of each arrester and its associated mounting shall coordinate with a 1B22 gauge copper conductor without causing a self-sustaining fire or permanently damaging other arrester positions. Where all cable pairs entering the central office are 1B24 gauge or finer, the arresters and mountings need only coordinate with 1B24 gauge cable conductors. Item 13 of appendix A of this section designates the gauge of the cable conductors serving the host office. Item 7 of appendix B of this section designates the gauge of the cable conductors serving the RST(s).
        (3) Central office protectors shall be mounted and arranged so that outside cable pairs may be terminated on the left side of protectors (when facing the vertical side of the MDF) or on the back surface of the protectors. Means for easy identification of pairs shall be provided.
        (4) Protectors shall have a ``dead front'' (either insulated or grounded) whereby live metal parts are not readily accessible.
        (5) Protectors shall be provided with an accessible terminal of each incoming conductor which is suitable for the attachment of a temporary test lead. They shall also be constructed so that auxiliary test fixtures may be applied to open and test the subscriber's circuit in either direction. Terminals shall be tinned or plated and shall be suitable for wire wrapped, insulation displacement or connectorized connections.
        (6) If specified in appendix A of this section, each protector group shall be furnished with a factory assembled tip cable for splicing to the entrance cable; the tip cable to be 20 feet (610 cm) in length unless otherwise specified. Factory assembled tip cable shall be 1B22 gauge and selected from RUS Bulletin 1755I-100, List of Materials Acceptable for Use on Telephone Systems of RUS Borrowers. Tip cable requirements are provided in RUS Bulletin 345 - 87, PE-87, RUS Specification for Terminating (TIP) Cable. Cables having other kinds of insulation and jackets which have equivalent resistance to fire and which produce less smoke and toxic fumes may be used if specifically approved by RUS.
        (7) Protectors shall be mounted on vertical supports, with centers not exceeding 9 inches (22.9 cm). The space between protector units shall be adequate for terminating conductors.
        (8) Cable supporting framework shall be provided between the cable entrance and the MDF when overhead cable entrance is specified in Item 14.3.3 of appendix A of this section.
        (9) The main distributing frame shall be equipped with a copper ground bus bar having the conductivity of a 1B6 American Wire Gauge (AWG) copper conductor or a greater conductivity, or may consist of another metal if specifically approved, provided it has adequate cross-sectional area to provide conductivity equivalent to, or better than, bare copper. A guardrail or equivalent shall also be furnished.
        (10) Other features not specified in paragraph (t) of this section may be required at the option of the owner, if checked in Item 13.4 of appendix A of this section.
        (11) Main frame protector makes and types shall be selected only from RUS Bulletin 1755I-100, List of Materials Acceptable for Use on Telephone Systems of RUS Borrowers. Protectors shall be capable of easy removal.
        (u) Electrical protection -- (1) Surge protection. (i) Adequate electrical protection of central office switching equipment shall be included in the design of the system. The characteristics and application of protection devices shall be such that they enable the central office switching equipment to withstand, without damage or excessive protector maintenance, the dielectric stresses and currents that are produced in line-to-ground and tip-to-ring circuits through the equipment as a result of induced or conducted lightning or power system fault-related surges. All wire terminals connected to outside plant wire or cable pairs shall be protected from voltage and current surges.
        (ii) Central office switching equipment shall pass laboratory tests, simulating the hostile electrical environment, before being placed in the field for the purpose of obtaining field experience. There are five basic types of laboratory tests which shall be applied to exposed terminals in an effort to determine if the equipment will survive. Figure 3 summarizes these tests and the minimum acceptable levels of protection for equipment to pass
(TABLE START)them.
Figure 3 -- Summary of Electrical Requirements and Tests
@h1Test
@h1Application Criteria
@h1Peak Voltage or Current
@h1Surge Waveshape
@h1No. of Applications & Max. Time Between
@h1Comments
        Current Surge .... Low Impedance Paths Exposed to Surges .... 500A or Lesser Current (See Fig. 5) .... 10x1000 ms .... 5 each Polarity at 1 minute intervals
        60 Hz Current Carrying .... High or Low Impedance paths Exposed to Surges .... 10A rms or Lesser Current (See Fig. 6) .... 11 Cycles of 60 Hz (0.183 Sec.) .... 3 each Polarity at 1 minute intervals
        AC Power Service Surge Voltage .... AC Power Service Connection .... 2500V or +3 s clamping V of arrester employed at 10kV/ms .... 1.2x50 ms .... 5 each Polarity at 1 minute intervals .... AC arrester, if used, must be removed. Communications line arresters, if used, remain in place.
        Voltage Surge .... High Impedance Paths Exposed to Surges .... 1000V or +3 s dc breakdown of arrester employed .... 10x1000 ms .... Same .... All primary arresters, if used, must be removed.
        Arrester Response Delay .... Paths protected by arresters, such as gas tubes, with breakdown dependent on V. rate of rise. .... +3 s breakdown of arrester employed at 100V/ms of rise  .... 100V/ms rise decay to 1/2 V. in tube's delay time .... Same .... Same
(TABLE END)
        (iii) Two categories of surge tests. (A) Current surge tests simulate the stress to which a relatively low impedance path may be subjected before main frame protectors break down. Paths with a 100 Hz impedance of 50 ohms or less shall be subjected to current surges, employing a 10 0A 1000 microseconds waveshape as defined in Figure 4. For the purpose of determining this impedance, arresters which are mounted within the equipment are to be considered zero impedance. The crest current shall not exceed 500A; however, depending on the impedance of the test specimen this value of current may be lower. The crest current through the sample, multiplied by the sample's 100 Hz impedance, shall not exceed 1000 volts (V). Where sample impedance is less than two ohms, crest current shall be limited to 500A as shown in Figure 5.
Figure 4 -- Explanation of Surge Waveshape
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1598 l 18680 1928 s m18680 1614 l 18697 1945 s m18697 1598 l 18813 1945 s m18813 1846 l 18548 1945 s m18813 1945 l 18614 1598 s m18747 1598 l 18565 1945 s m18548 1846 l 18581 1945 s m18548 1895 l 18598 1945 s m18548 1912 l 18631 1945 s m18548 1928 l 18730 1945 s m18813 1928 l 18763 1945 s m18813 1912 l 18780 1945 s m18813 1895 l 18796 1945 s m18813 1846 l 18664 1614 s m18631 1598 l 18664 1631 s m18647 1598 l 18697 1631 s m18714 1598 l 18697 1614 s m18730 1598 l 18929 1945 s m18929 1598 l 18945 1928 s m18945 1614 l 18962 1945 s m18962 1598 l 18879 1945 s m19011 1945 l 18879 1598 s m19011 1598 l 18896 1945 s m18929 1928 l 18912 1945 s m18929 1912 l 18978 1945 s m18962 1912 l 18995 1945 s m18962 1928 l 18929 1614 s m18896 1598 l 18929 1631 s m18912 1598 l 18962 1631 s m18978 1598 l 18962 1614 s m18995 1598 l 19127 1945 s m19127 1614 l 19127 1945 s m19243 1598 l 19143 1945 s m19243 1647 l 19160 1945 s m19259 1647 l 19358 1945 s m19243 1598 l 19358 1945 s m19358 1598 l 19375 1928 s m19375 1614 l 19391 1945 s m19391 1598 l 19077 1945 s m19160 1945 l 19358 1945 s m19441 1945 l 19077 1598 s m19176 1598 l 19309 1598 s m19441 1598 l 19094 1945 s m19127 1928 l 19408 1945 s m19391 1912 l 19425 1945 s m19391 1928 l 19127 1614 s m19094 1598 l 19127 1614 s m19160 1598 l 19358 1614 s m19325 1598 l 19358 1631 s m19342 1598 l 19391 1631 s m19408 1598 l 19391 1614 s m19425 1598 l 19558 1945 s m19558 1598 l 19574 1928 s m19574 1614 l 19591 1945 s m19591 1598 l 19508 1945 s m19773 1945 l 19773 1846 l 19591 1780 s m19690 1780 l 19690 1846 s m19690 1713 l 19508 1598 s m19773 1598 l 19773 1697 l 19525 1945 s m19558 1928 l 19541 1945 s m19558 1912 l 19607 1945 s m19591 1912 l 19624 1945 s m19591 1928 l 19690 1945 s m19773 1928 l 19723 1945 s m19773 1912 l 19740 1945 s m19773 1895 l 19756 1945 s m19773 1846 l 19690 1846 s m19674 1780 l 19690 1713 l 19690 1813 s m19657 1780 l 19690 1746 l 19690 1796 s m19624 1780 l 19690 1763 l 19558 1614 s m19525 1598 l 19558 1631 s m19541 1598 l 19591 1631 s m19607 1598 l 19591 1614 s m19624 1598 l 19690 1598 s m19773 1614 l 19723 1598 s m19773 1631 l 19740 1598 s m19773 1647 l 19756 1598 s m19773 1697 l s end restore%%Trailer@!_
        Surge Waveshape is defined as follows:
        Rise Time 0A Time to Decay to Half Crest Value
        (For example, 10 0A 1000 ms)
Notes:
T1 = Time to determine the rate of rise. The rate of rise is determined as the slope between 10% and 90% of peak voltage or current.
T2 = Time to 50% of peak voltage (decay to half value).
Figure 5 -- Explanation of Surge Waveshape
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/FID ne{ dup /Encoding eq{ exch dup length array copy newfont 3 1 roll put }{ exch newfont 3 1 roll put }ifelse }{pop pop }ifelse }forallnewfont /FontName newfontname putnewcodesandnames aload popnewcodesandnames length 2 idiv{ newfont /Encoding get 3 1 roll put}repeat newfontname newfont definefont popend }def/spanvec [8#200 /Ccedilla8#201 /udieresis8#202 /eacute8#203 /acircumflex8#204 /adieresis8#205 /agrave8#206 /aring8#207 /ccedilla8#210 /ecircumflex8#211 /edieresis8#212 /egrave8#213 /idieresis8#214 /icircumflex8#215 /igrave8#216 /Adieresis8#217 /Aring8#220 /Eacute8#221 /ae8#222 /AE8#223 /ocircumflex8#224 /odieresis8#225 /ograve8#226 /ucircumflex8#227 /ugrave8#230 /ydieresis8#231 /Odieresis8#232 /Udieresis8#233 /oslash8#234 /sterling8#235 /Oslash8#240 /aacute8#241 /iacute8#242 /oacute8#243 /uacute8#244 /ntilde8#245 /Nacute8#246 /ordfeminine8#247 /ordmasculine8#250 /questiondown8#251 /endash8#255 /exclamdown8#256 /guillemotleft8#257 /guillemotright8#341 /germandbls8#345 /space8#346 /u8#347 /space8#350 /space8#351 /space%%8#365 /section8#370 /ring8#376 /endash] defend %pop HGdict off the dictionary stack%%EndProlog%%BeginSetupsaveHGdict begin72 2400 div dup scale1 setlinewidth 0 setlinecap 0 setlinejoin[] 0 setdash 0 setgray 10 setmiterlimit%%BeginFont: IntlHelvetica/Helvetica /IntlHelvetica spanvec ReEncodeSmall%%EndFont%%BeginFont: IntlTimes-Roman/Times-Roman /IntlTimes-Roman spanvec ReEncodeSmall%%EndFont%%BeginFont: IntlTimes-Italic/Times-Italic /IntlTimes-Italic spanvec ReEncodeSmall%%EndFont%%EndSetup%%Page: one 1newpath3000 2400 translatel4s s 0 setgray381 12779 m381 7987 l 420 7987 l 420 12779 l 381 12779 l eofill381 12779 s m381 7987 l 420 7987 l 420 12779 l 381 12779 l s 400 7958 m30 7958 l 30 8016 l 400 8016 l 400 7958 l eofill400 7958 s m30 7958 l 30 8016 l 400 8016 l 400 7958 l s 400 7958 m800 7958 l 800 8016 l 400 8016 l 400 7958 l eofill400 7958 s m800 7958 l 800 8016 l 400 8016 l 400 7958 l s 800 7559 m30 7559 l 30 7616 l 800 7616 l 800 7559 l 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l 9891 14903 l 9872 14922 l 9815 14941 l 9777 14941 l 9720 14922 l 9683 14884 l 9664 14827 l 9664 14789 l 9683 14733 l 9720 14695 l 9777 14676 l 9815 14676 l 9872 14695 l 9910 14733 l 9891 14846 s m9891 14865 l 9872 14903 l 9702 14884 s m9683 14846 l 9683 14770 l 9702 14733 l 9872 14827 s m9872 14884 l 9853 14922 l 9815 14941 l 9777 14941 s m9739 14922 l 9720 14903 l 9702 14846 l 9702 14770 l 9720 14714 l 9739 14695 l 9777 14676 l 948 8707 s m948 8688 l 967 8688 l 967 8707 l 948 8707 l 948 8726 s m967 8726 l 985 8707 l 985 8688 l 967 8670 l 948 8670 l 929 8688 l 929 8707 l 948 8745 l 967 8764 l 1023 8783 l 1099 8783 l 1156 8764 l 1175 8726 l 1175 8670 l 1156 8632 l 1099 8613 l 1137 8764 s m1156 8726 l 1156 8670 l 1137 8632 l 1080 8783 s m1118 8764 l 1137 8726 l 1137 8670 l 1118 8632 l 1080 8613 l 1042 8613 s m1099 8613 l 1137 8594 l 1175 8556 l 1193 8518 l 1193 8462 l 1175 8424 l 1156 8405 l 1099 8386 l 1023 8386 l 967 8405 l 948 8424 l 929 8462 l 929 8480 l 948 8499 l 967 8499 l 985 8480 l 985 8462 l 967 8443 l 948 8443 l 1156 8556 s m1175 8518 l 1175 8462 l 1156 8424 l 1080 8613 s m1118 8594 l 1137 8575 l 1156 8518 l 1156 8462 l 1137 8405 l 1099 8386 l 948 8480 s m948 8462 l 967 8462 l 967 8480 l 948 8480 l 1420 8783 s m1363 8764 l 1326 8707 l 1307 8613 l 1307 8556 l 1326 8462 l 1363 8405 l 1420 8386 l 1458 8386 l 1515 8405 l 1553 8462 l 1571 8556 l 1571 8613 l 1553 8707 l 1515 8764 l 1458 8783 l 1420 8783 l 1363 8745 s m1345 8707 l 1326 8632 l 1326 8537 l 1345 8462 l 1363 8424 l 1515 8424 s m1534 8462 l 1553 8537 l 1553 8632 l 1534 8707 l 1515 8745 l 1420 8783 s m1382 8764 l 1363 8726 l 1345 8632 l 1345 8537 l 1363 8443 l 1382 8405 l 1420 8386 l 1458 8386 s m1496 8405 l 1515 8443 l 1534 8537 l 1534 8632 l 1515 8726 l 1496 8764 l 1458 8783 l 1799 8783 s m1742 8764 l 1705 8707 l 1686 8613 l 1686 8556 l 1705 8462 l 1742 8405 l 1799 8386 l 1837 8386 l 1894 8405 l 1932 8462 l 1950 8556 l 1950 8613 l 1932 8707 l 1894 8764 l 1837 8783 l 1799 8783 l 1742 8745 s m1724 8707 l 1705 8632 l 1705 8537 l 1724 8462 l 1742 8424 l 1894 8424 s m1913 8462 l 1932 8537 l 1932 8632 l 1913 8707 l 1894 8745 l 1799 8783 s m1761 8764 l 1742 8726 l 1724 8632 l 1724 8537 l 1742 8443 l 1761 8405 l 1799 8386 l 1837 8386 s m1875 8405 l 1894 8443 l 1913 8537 l 1913 8632 l 1894 8726 l 1875 8764 l 1837 8783 l 2405 8651 s m2405 8480 l 2423 8424 l 2442 8405 l 2480 8386 l 2537 8386 l 2575 8405 l 2594 8424 l 2613 8462 l 2423 8632 s m2423 8462 l 2442 8424 l 2348 8651 s m2442 8651 l 2442 8462 l 2461 8405 l 2480 8386 l 2613 8651 s m2613 8386 l 2707 8386 l 2631 8632 s m2631 8405 l 2556 8651 s m2650 8651 l 2650 8386 l 2367 8651 s m2405 8632 l 2386 8651 s m2405 8613 l 2650 8424 s m2669 8386 l 2650 8405 s m2688 8386 l 2840 8783 s m2840 8386 l 2858 8764 s m2858 8405 l 2877 8783 s m2877 8386 l 2783 8783 s m3085 8783 l 3085 8670 l 2877 8594 s m2991 8594 l 2991 8670 s m2991 8518 l 2783 8386 s m2934 8386 l 2802 8783 s m2840 8764 l 2821 8783 s m2840 8745 l 2896 8783 s m2877 8745 l 2915 8783 s m2877 8764 l 2991 8783 s m3085 8764 l 3029 8783 s m3085 8745 l 3048 8783 s m3085 8726 l 3066 8783 s m3085 8670 l 2991 8670 s m2972 8594 l 2991 8518 l 2991 8632 s m2953 8594 l 2991 8556 l 2991 8613 s m2915 8594 l 2991 8575 l 2840 8405 s m2802 8386 l 2840 8424 s m2821 8386 l 2877 8424 s m2896 8386 l 2877 8405 s m2915 8386 l 1342 7781 s m1323 7819 l 1286 7837 l 1229 7837 l 1191 7819 l 1172 7800 l 1153 7743 l 1153 7686 l 1172 7648 l 1210 7629 l 1267 7629 l 1305 7648 l 1323 7686 l 1229 7837 s m1191 7800 l 1172 7743 l 1172 7686 l 1191 7648 l 1210 7629 l 1342 7837 s m1323 7686 l 1323 7648 l 1361 7629 l 1399 7629 l 1437 7667 l 1456 7724 l 1456 7762 l 1437 7819 l 1418 7856 l 1380 7894 l 1342 7913 l 1286 7932 l 1229 7932 l 1172 7913 l 1134 7894 l 1097 7856 l 1078 7819 l 1059 7762 l 1059 7705 l 1078 7648 l 1097 7611 l 1134 7573 l 1172 7554 l 1229 7535 l 1286 7535 l 1342 7554 l 1380 7573 l 1399 7592 l 1361 7837 s m1342 7686 l 1342 7648 l 1361 7629 l 1873 7932 s m2005 7535 l 1892 7932 s m2005 7592 l 2005 7535 l 1911 7932 s m2024 7592 l 2137 7913 s m2005 7535 l 1835 7932 s m1967 7932 l 2062 7932 s m2175 7932 l 1854 7932 s m1892 7894 l 1929 7932 s m1911 7894 l 1948 7932 s m1911 7913 l 2100 7932 s m2137 7913 l 2156 7932 s m2137 7913 l 2285 7585 s m2285 7188 l 2303 7566 s m2303 7207 l 2322 7585 s m2322 7188 l 2228 7585 s m2455 7585 l 2511 7566 l 2530 7547 l 2549 7509 l 2549 7472 l 2530 7434 l 2511 7415 l 2455 7396 l 2511 7547 s m2530 7509 l 2530 7472 l 2511 7434 l 2455 7585 s m2493 7566 l 2511 7528 l 2511 7453 l 2493 7415 l 2455 7396 l 2322 7396 s m2455 7396 l 2511 7377 l 2530 7358 l 2549 7320 l 2549 7264 l 2530 7226 l 2511 7207 l 2455 7188 l 2228 7188 l 2511 7358 s m2530 7320 l 2530 7264 l 2511 7226 l 2455 7396 s m2493 7377 l 2511 7339 l 2511 7245 l 2493 7207 l 2455 7188 l 2247 7585 s m2285 7566 l 2266 7585 s m2285 7547 l 2341 7585 s m2322 7547 l 2360 7585 s m2322 7566 l 2285 7207 s m2247 7188 l 2285 7226 s m2266 7188 l 2322 7226 s m2341 7188 l 2322 7207 s m2360 7188 l 6677 7985 s m6677 7588 l 6695 7966 s m6695 7607 l 6714 7985 s m6714 7588 l 6620 7985 s m6847 7985 l 6903 7966 l 6922 7947 l 6941 7909 l 6941 7872 l 6922 7834 l 6903 7815 l 6847 7796 l 6714 7796 l 6903 7947 s m6922 7909 l 6922 7872 l 6903 7834 l 6847 7985 s m6885 7966 l 6903 7928 l 6903 7853 l 6885 7815 l 6847 7796 l 6790 7796 s m6828 7777 l 6847 7739 l 6885 7626 l 6903 7588 l 6941 7588 l 6960 7626 l 6960 7664 l 6885 7664 s m6903 7626 l 6922 7607 l 6941 7607 l 6828 7777 s m6847 7758 l 6903 7645 l 6922 7626 l 6941 7626 l 6960 7645 l 6620 7588 s m6771 7588 l 6639 7985 s m6677 7966 l 6658 7985 s m6677 7947 l 6733 7985 s m6714 7947 l 6752 7985 s m6714 7966 l 6677 7607 s m6639 7588 l 6677 7626 s m6658 7588 l 6714 7626 s m6733 7588 l 6714 7607 s m6752 7588 l 7077 7585 s m7077 7188 l 7095 7566 s m7095 7207 l 7114 7585 s m7114 7188 l 7020 7585 s m7247 7585 l 7303 7566 l 7322 7547 l 7341 7509 l 7341 7453 l 7322 7415 l 7303 7396 l 7247 7377 l 7114 7377 l 7303 7547 s m7322 7509 l 7322 7453 l 7303 7415 l 7247 7585 s m7285 7566 l 7303 7528 l 7303 7434 l 7285 7396 l 7247 7377 l 7020 7188 s m7171 7188 l 7039 7585 s m7077 7566 l 7058 7585 s m7077 7547 l 7133 7585 s m7114 7547 l 7152 7585 s m7114 7566 l 7077 7207 s m7039 7188 l 7077 7226 s m7058 7188 l 7114 7226 s m7133 7188 l 7114 7207 s m7152 7188 l 11070 11579 s m11070 11182 l 11088 11560 s m11088 11201 l 11107 11579 s m11107 11182 l 11013 11579 s m11240 11579 l 11296 11560 l 11315 11541 l 11334 11503 l 11334 11466 l 11315 11428 l 11296 11409 l 11240 11390 l 11107 11390 l 11296 11541 s m11315 11503 l 11315 11466 l 11296 11428 l 11240 11579 s m11278 11560 l 11296 11522 l 11296 11447 l 11278 11409 l 11240 11390 l 11183 11390 s m11221 11371 l 11240 11333 l 11278 11220 l 11296 11182 l 11334 11182 l 11353 11220 l 11353 11258 l 11278 11258 s m11296 11220 l 11315 11201 l 11334 11201 l 11221 11371 s m11240 11352 l 11296 11239 l 11315 11220 l 11334 11220 l 11353 11239 l 11013 11182 s m11164 11182 l 11032 11579 s m11070 11560 l 11051 11579 s m11070 11541 l 11126 11579 s m11107 11541 l 11145 11579 s m11107 11560 l 11070 11201 s m11032 11182 l 11070 11220 s m11051 11182 l 11107 11220 s m11126 11182 l 11107 11201 s m11145 11182 l 11896 11222 s m11914 11279 l 11914 11166 l 11896 11222 l 11858 11260 l 11801 11279 l 11744 11279 l 11688 11260 l 11650 11222 l 11650 11166 l 11669 11128 l 11725 11090 l 11839 11052 l 11877 11033 l 11896 10995 l 11896 10939 l 11877 10901 l 11669 11166 s m11688 11128 l 11725 11109 l 11839 11071 l 11877 11052 l 11896 11014 l 11688 11260 s m11669 11222 l 11669 11184 l 11688 11147 l 11725 11128 l 11839 11090 l 11896 11052 l 11914 11014 l 11914 10958 l 11896 10920 l 11877 10901 l 11820 10882 l 11763 10882 l 11706 10901 l 11669 10939 l 11650 10995 l 11650 10882 l 11669 10939 l 13946 7585 s m14078 7188 l 13965 7585 s m14078 7245 l 14078 7188 l 13984 7585 s m14097 7245 l 14210 7566 s m14078 7188 l 13908 7585 s m14040 7585 l 14135 7585 s m14248 7585 l 13927 7585 s m13965 7547 l 14002 7585 s m13984 7547 l 14021 7585 s m13984 7566 l 14173 7585 s m14210 7566 l 14229 7585 s m14210 7566 l 14402 7186 s m14402 6789 l 14420 7167 s m14420 6808 l 14439 7186 s m14439 6789 l 14345 7186 s m14496 7186 l 14345 6789 s m14628 6789 l 14628 6902 l 14364 7186 s m14402 7167 l 14383 7186 s m14402 7148 l 14458 7186 s m14439 7148 l 14477 7186 s m14439 7167 l 14402 6808 s m14364 6789 l 14402 6827 s m14383 6789 l 14439 6827 s m14458 6789 l 14439 6808 s m14477 6789 l 14534 6789 s m14628 6808 l 14572 6789 s m14628 6827 l 14591 6789 s m14628 6846 l 14610 6789 s m14628 6902 l 19201 8184 s m18937 8184 l 18937 8071 l 19164 8184 s m18937 7787 l 19183 8184 s m18956 7787 l 19201 8184 s m18975 7787 l 18937 7787 s m19201 7787 l 19201 7900 l 18956 8184 s m18937 8071 l 18975 8184 s m18937 8127 l 18993 8184 s m18937 8146 l 19031 8184 s m18937 8165 l 19107 7787 s m19201 7806 l 19145 7787 s m19201 7825 l 19164 7787 s m19201 7844 l 19183 7787 s m19201 7900 l 19434 7947 s m19434 7588 l 19453 7947 s m19453 7607 l 19472 7985 s m19472 7588 l 19472 7985 s m19415 7928 l 19377 7909 l 19359 7588 s m19548 7588 l 19434 7607 s m19396 7588 l 19434 7626 s m19415 7588 l 19472 7626 s m19491 7588 l 19472 7607 s m19510 7588 l 19813 7985 s m19756 7966 l 19719 7909 l 19700 7815 l 19700 7758 l 19719 7664 l 19756 7607 l 19813 7588 l 19851 7588 l 19908 7607 l 19946 7664 l 19964 7758 l 19964 7815 l 19946 7909 l 19908 7966 l 19851 7985 l 19813 7985 l 19756 7947 s m19738 7909 l 19719 7834 l 19719 7739 l 19738 7664 l 19756 7626 l 19908 7626 s m19927 7664 l 19946 7739 l 19946 7834 l 19927 7909 l 19908 7947 l 19813 7985 s m19775 7966 l 19756 7928 l 19738 7834 l 19738 7739 l 19756 7645 l 19775 7607 l 19813 7588 l 19851 7588 s m19889 7607 l 19908 7645 l 19927 7739 l 19927 7834 l 19908 7928 l 19889 7966 l 19851 7985 l 20191 7985 s m20134 7966 l 20097 7909 l 20078 7815 l 20078 7758 l 20097 7664 l 20134 7607 l 20191 7588 l 20229 7588 l 20286 7607 l 20324 7664 l 20342 7758 l 20342 7815 l 20324 7909 l 20286 7966 l 20229 7985 l 20191 7985 l 20134 7947 s m20116 7909 l 20097 7834 l 20097 7739 l 20116 7664 l 20134 7626 l 20286 7626 s m20305 7664 l 20324 7739 l 20324 7834 l 20305 7909 l 20286 7947 l 20191 7985 s m20153 7966 l 20134 7928 l 20116 7834 l 20116 7739 l 20134 7645 l 20153 7607 l 20191 7588 l 20229 7588 s m20267 7607 l 20286 7645 l 20305 7739 l 20305 7834 l 20286 7928 l 20267 7966 l 20229 7985 l s end restore%%Trailer@!
VL = Not to exceed 1000V
VB = Charging Voltage
Z100 = Test Specimen Impedance to be measured at 100 Hz.
RP = Parallel Resistance (Waveshape)
(TABLE START)
RS = Series Resistance (Current Limiting)
@h1Z100
@h1RS
@h1RP
@h1VB
        0  .... 5  ....   .... 2500
        1  .... 4  ....   .... 2500
        2  .... 3  ....   .... 2500
        3  .... 2  ....   .... 1670
        4  .... 1  ....   .... 1250
        5  .... 0  ....   .... 1000
        7.5  .... 0  .... 15  .... 1000
        10  .... 0  .... 10  .... 1000
        15  .... 0  .... 7.5  .... 1000
        20  .... 0  .... 6.7  .... 1000
        25  .... 0  .... 6.25  .... 1000
        30  .... 0  .... 6  .... 1000
        40  .... 0  .... 5.7  .... 1000
        50  .... 0  .... 5.5  .... 1000
(TABLE END)
         (B) Sixty Hertz (60 Hz) current-carrying tests should be applied to simulate an ac power fault which is conducted to the unit over the cable pairs. The test should be limited to 10 amperes rms at 60 Hz for a period of 11 cycles (0.1835 seconds) and should be applied longitudinally from line to ground (see Figures 3 and 6 of this section).
Figure 6 -- 60 Hz Current Surge Test
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/u8#347 /space8#350 /space8#351 /space%%8#365 /section8#370 /ring8#376 /endash] defend %pop HGdict off the dictionary stack%%EndProlog%%BeginSetupsaveHGdict begin72 2400 div dup scale1 setlinewidth 0 setlinecap 0 setlinejoin[] 0 setdash 0 setgray 10 setmiterlimit%%BeginFont: IntlHelvetica/Helvetica /IntlHelvetica spanvec ReEncodeSmall%%EndFont%%BeginFont: IntlTimes-Roman/Times-Roman /IntlTimes-Roman spanvec ReEncodeSmall%%EndFont%%BeginFont: IntlTimes-Italic/Times-Italic /IntlTimes-Italic spanvec ReEncodeSmall%%EndFont%%EndSetup%%Page: one 1newpath3000 2400 translatel4s 0 setgray1450 5619 s m1450 5625 l 1449 5651 l 1448 5676 l 1445 5701 l 1442 5726 l 1438 5751 l 1433 5776 l 1427 5801 l 1421 5825 l 1413 5849 l 1404 5872 l 1395 5897 l 1385 5919 l 1374 5943 l 1362 5964 l 1350 5987 l 1336 6008 l 1323 6029 l 1308 6050 l 1293 6070 l 1276 6089 l 1260 6109 l 1243 6127 l 1224 6145 l 1206 6162 l 1187 6178 l 1167 6194 l 1146 6209 l 1126 6223 l 1104 6237 l 1082 6250 l 1060 6262 l 1038 6273 l 1014 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V -- 700 Volts RMS (Approximately 1000V Peak).
Z60 -- Test specimen impedance to be measured at 60 Hz.
RS -- Series Resistance (current limiting) in each side of line.
(TABLE START)(Source impedance never less than 50 V longitudinal.)
@h1Z60 Hz
@h1RS
        0  .... 140
        10  .... 120
        20  .... 100
        50  .... 100
        Over 50  .... 100
(TABLE END)
        (C) AC power service surge voltage tests should be applied to the power input terminals of ac powered devices to simulate switching surges or lightning-induced transients on the ac power system. The test shall employ a 1.2 0A 50 microseconds waveshape with a crest voltage of 2500V. Communications line protectors may be left in place for this test. Borrowers are urged to install commercially available surge protectors at the ac service entrance as part of their COE building program.
         (D) Voltage surge tests simulate the voltage stress to which a relatively high impedance path may be subjected before primary protectors break down and protect the circuit. To assure coordination with the primary protection while reducing testing to the minimum, voltage surge tests should be conducted at a 1000 volts with primary arresters removed for devices protected by carbon blocks, or the +3 sigma dc breakdown of other primary arresters. Surge waveshape should be 10 0A 1000 microseconds.
        (E) Arrester response delay tests are designed to stress the equipment in a manner similar to that caused by the delayed breakdown of gap type arresters when subjected to rapidly rising voltages. Arresters shall be removed for these tests, the peak surge voltage should be the +3 sigma breakdown of the arrester in question on a voltage rising at 100V per microsecond and the time for the surge to decay to half voltage shall equal at least the delay time of the tube, as explained in Figure 7.
Figure 7 -- Explanation of Arrester Response Delay Time
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The delay time is that period of time when the potential across an arrester exceeds its dc firing level.
        (iv) Five applications of each polarity for the surge tests and three for the 60 Hz Current Carrying Test are the minimum required. All tests should be conducted with not more than 1 minute between consecutive applications in each series of three or five to a specific configuration so that heating effects will be cumulative. As not all tests are required in every application, nonapplicable tests should be omitted. Tests should be conducted in the following sequence.
        (A) Current Impulse Test.
        (B) Sixty Hertz (60 Hz) Current Carrying Test.
        (C) AC Power Service Impulse Voltage Test.
        (D) Voltage Impulse Test.
        (E) Arrester Response Delay Test.
        (v) Tests should be applied between each of the following terminal combinations for all line operating conditions.
        (A) Line tip to ring.
        (B) Line ring to ground.
        (C) Line tip to ground.
        (D) Line tip to ring tied together to ground.
        (2) Extraordinary surge protection. A central office or RST may be located in an area where ground conditions prevent the reasonable economic achievement of a low resistance to ground and/or there exists a greater than average probability of surge damage. Such an unusually hostile operating environment shall be recognized and taken into consideration by the bidder in the engineering and specification of the central office switching system and line protection. This subject of operating environment, ground conditions, etc., should be discussed at the time of technical presentation to assure the owner that adequate system protection will be provided by the bidder.
        (3) Dielectric strength. Arresters shall be removed for all dielectric strength tests. The duration of all dielectric strength tests shall be at least 1 second. The applied potential shall equal or exceed the +3 sigma dc breakdown voltage of the arrester, provided by the COE manufacturer. Direct current potentials shall be applied between all line terminals and equipment chassis and between these terminals and grounded equipment housings in all instances where the circuitry is dc open circuit from the chassis, or connected to the chassis through a capacitor.
        (4) Insulation resistance. Following the dielectric tests, the insulation resistance of the installed electrical circuits between wires and ground, with the normal equipment grounds removed, shall not be less than 10 megohms at 500 volts dc at approximately room temperature (68_F (20_C)) and at a relative humidity of approximately 50 percent. The measurement shall be made after the meter stabilizes, unless the requirement is met sooner. Arresters shall be removed for these tests.
        (5) Self-protection. (i) All components shall be of the self-protecting type, capable of being continuously energized at rated voltage without injurious results.
        (ii) The unit equipment shall not be permanently damaged by accidental short circuits of any duration across either the central office side tip and ring or the line side tip and ring. A test is to be made with the unit energized at the highest recommended voltages.
        (6) Static discharge. Assemblies subject to damage by static discharge shall be identified and special handling instructions shall be supplied.
        (v) Miscellaneous -- (1) Office wire. All office wire shall be of soft annealed tinned copper wire meeting the requirements of ASTM Specification B 33 - 91, Standard Specification for Tinned Soft or Annealed Copper Wire for Electrical Purposes, and of suitable cross-section to provide safe current carrying capacity and mechanical strength. The insulation of installed wire, connected to its equipment and frames, shall be capable of withstanding the same insulation resistance and dielectric strength requirements as given in paragraphs (u)(3) and (u)(4) of this section at a temperature of 120_F (49_C) and a relative humidity of 90 percent.
        (2) Wire wrapped terminals. These terminals are preferred and where used shall be of a material suitable for wire wrapping. The connections to them shall be made with a wire wrapping tool with the following minimum number of successive nonoverlapping turns of bare tinned copper wire in contact with each terminal.
        (i) 6 Turns of 30 Gauge.
        (ii) 6 Turns of 26 Gauge.
        (iii) 6 Turns of 24 Gauge.
        (iv) 5 Turns of 22 Gauge.
        (3) Protection against corrosion. All metal parts of equipment frames, distributing frames, cable supporting framework, and other exposed metal parts shall be constructed of corrosion resistant materials or materials plated or painted to render them adequately corrosion resistant.
        (4) Screws and bolts. Screw threads for all threaded securing devices shall be of American National Standard form in accordance with Federal Standard H28, Screw-Thread Standards for Federal Services, unless exceptions are granted to the manufacturer of the switching equipment. All bolts, nuts, screws, and washers shall be of nickel-copper alloy, steel, brass or bronze.
        (5) Temperature and humidity range. The supplier shall furnish the operating temperature and humidity ranges of the equipment being provided in order that adequate heating and cooling may be supplied (see Items 5.2.1 and 5.2.2 of appendix C of this section).
        (6) Stenciling. Equipment units and terminal jacks shall be adequately designated and numbered. They shall be stenciled so that identification of equipment units and leads for testing or traffic analysis can be made without unnecessary reference to prints or descriptive literature.
        (7) Equipment frame design. For newly designed systems, consideration should be given to the desirability of providing frames which can be installed in rooms of normal ceiling height [up to 10 feet (305 cm)]. Where feasible, frames and equipment units shall be designed for ready portability and high salvage value.
        (8) Quantity of equipment bays. Consistent with system arrangements and ease of maintenance, space shall be provided on the floor plan for an orderly layout of future equipment bays that will be required for anticipated traffic when the office reaches its ultimate size. Readily accessible terminals shall be provided for connection to interbay and frame cables to future bays. All cables, interbay and intrabay (excluding power), if technically feasible, shall be terminated at both ends by use of connectors.
        (w) Remote switching terminal (RST) -- (1) General. The RST is a remotely located digital switching terminal which is placed at a subordinate wire center for subscriber lines and is a part of the host central office from a switching standpoint, and has hardware interchangeable with the host office, except for items that are applicable only to RST control and associated peripheral equipment. This does not preclude the use of existing in-service remote units on a new or upgraded host central office of the latest series generic or release.
        (2) Span line. The RST is to be connected to the host central office via a means compatible with T1 type span lines using a DS-1 interface. This connection will be for control supervision and subscriber communication. The RUS equipment specification for a span line is PE-60.
        (3) Switching. (i) The RST may have its switching functions controlled either by the host central office stored program control processors or by local subordinate processors which communicate with the host office processors.
        (ii) As long as the connecting span line is intact, the subscribers served by the RST shall have all features, traffic capacity, and services including busy verification, available to all other subscribers in the system.
        (iii) The RST shall have available an emergency call processing option which permits calling among all subscribers and from subscribers to emergency numbers within the RST if control link connections to the host central office are severed or otherwise disabled. The RST shall be capable of rerouting normally used emergency numbers, such as 911, to predetermined line terminations in this emergency stand-alone operating condition. This RST emergency call processing option shall be provided only when specified by the owner in Item 6.1 of appendix B of this section.
        (4) Subscriber line test. (i) Means shall be available on an optional basis to the maintenance personnel to make subscriber line tests from a common location for all subscriber lines including the RST.
        (ii) If tests in paragraph (w)(4)(i) of this section are not requested by the owner for a particular installation, a subscriber loop test set (see paragraph (o)(2)(iii)(A) of this section) shall be supplied at the RST with a means to access all lines.
        (5) Housing. When housed in a building supplied by the owner, a complete floor plan including ceiling height, power outlets, cable entrances, equipment entry and travel, type of construction, and other pertinent dimensions shall be supplied with this section.
        (6) Power -- (i) Chargers. A single charger meeting the requirements of paragraph (s)(3) of this section (with the exception of paragraph (s)(3)(viii) of this section) is required. An additional charger capable of carrying the full load or a combination of three chargers each capable of carrying half the load shall be supplied if redundant chargers are specified in appendix B of this section.
        (ii) Ringing equipment provisioning. (A) Ringing sources shall be supplied in duplicate.
        (B) An exception to the duplicated ringing source requirement permits nonduplicated ringing source(s) to be utilized where there is full compliance with the following service criteria.
        (1) In a remote switching terminal (RST) of 400 or more equipped lines, a single nonduplicated ringing source failure shall not cause the complete loss of ringing capability to more than 100 lines.
        (2) In a remote switching terminal (RST) of less than 400 equipped lines, a single nonredundant ringing source failure shall not cause the complete loss of ringing capability to more than 25 percent of the total equipped lines.
        (iii) Power converter. (A) Power converters required for the purpose of providing various operating voltages to printed circuit boards or similar equipment employing electronic components shall be provided in duplicate with each unit capable of immediately assuming the full operating load upon failure of a unit.
        (B) An exception to the duplicate power converter requirement permits nonduplicated power converter(s) to be utilized where there is full compliance with the following criteria.
        (1) The failure of any single nonduplicated power converter shall not reduce the grade of service of common control and service circuits to any individual line or trunk by more than 50 percent.
        (2) The failure of any single nonduplicated power converter shall not reduce the traffic carrying capacity of any trunk group or service links to a host office by more than 50 percent.
        (3) In a remote switching terminal (RST) of 400 or more equipped lines, any single nonduplicated power converter failure shall not cause a complete loss of service to more than 100 equipped lines.
        (4) In a remote switching terminal (RST) of less than 400 equipped lines, any single nonduplicated power converter failure shall not cause a complete loss of service to more than 25 percent of the total equipped lines.
        (7) Alarm. Sufficient system alarm points shall be provided from the RST to report conditions to the host alarm system.
        (x) Responsibilities of the bidder -- (1) Central office layout. (i) The successful bidder shall furnish tentative floor plan layout drawings showing the arrangement of the equipment and the dimensions of major equipment units. These drawings shall include minimum door dimensions and ceiling heights required for installation, maintenance and ventilation. If requested by the owner, the floor plan shall be such that the battery, charger, power board, main distributing frame and wire chief's test equipment are isolated from the other equipment by a partition.
        (ii) The layout drawings shall also show provision for the ultimate capacity of the central office as specified by the owner.
        (iii) After approval by the owner of the tentative floor plan, and within 10 calendar days after approval of the contract by the Administrator, the owner shall furnish the bidder the necessary data on the actual floor plan. Within 20 calendar days after receiving the necessary building data, the bidder shall then supply floor plan drawings showing exact locations of all equipment, both initial and ultimate, including points where connection to commercial power are required, with voltage and wattage indicated at each point. Within 20 calendar days after receiving the floor plan drawings from the bidder, the owner shall approve these drawings or take the necessary steps to have the drawings changed to meet his approval. The layout planning must be so coordinated between the owner and the bidder as not to delay the scheduled equipment installation date.
        (2) Shipment of main distributing frame (MDF). The bidder shall ship the MDF equipment, with all necessary instructions to permit its installation by the owner, at the time requested by the owner in writing, provided such time is not earlier than 90 days prior to the date specified for the shipment of the rest of the central office equipment. If the owner or the owner's agent installs the main distributing frame, the owner shall assume the responsibility and the expense of proper installation according to information furnished by the bidder.
        (3) Drawings and printed material. (i) The bidder shall supply instructional material for each exchange involved at the time of delivery of the equipment. It is not the intent of this section to require system documentation necessary for the repair of individual circuit boards. The bidder shall supply three complete sets of legible drawings, each set to include all of the following drawings and documentation:
        (A) A floor plan showing exact dimensions and location of each equipment frame or item to a convenient scale;
        (B) A block schematic drawing showing the various equipment components in the system, and their identifying circuit number (e.g., MDF, line circuits, memory, trunks, etc.);
        (C) Drawings of major equipment items such as frames, with the location of major component items of equipment shown;
        (D) Individual functional drawings for electrical circuits in the system;
        (E) A detailed description of the operation of each circuit down to a circuit package level;
        (F) Wiring diagrams indicating the specific method of wiring used on each item of equipment and interconnection wiring between items of equipment;
        (G) Sufficient software documentation to maintain and service the system, including drawings showing principal aspects of the software architecture;
        (H) Individual maintenance drawings covering each equipment item that contains replaceable parts, appropriately identifying each part by name and part number, or, complete ordering instructions for all replaceable parts if individual item drawings are not provided; and
        (I) Job drawings including all drawings that are individual to the particular office involved, such as main frame, power panel, test board, etc.
        (ii) The following information shall also be furnished:
        (A) Complete index of the required drawings;
        (B) Explanation of electrical principles of operation of the overall switching system;
        (C) List of tests which can be performed with each piece of test equipment furnished, and explanation of the method of performing each test;
        (D) Sample of each form recommended for use in keeping records of tests;
        (E) Criteria for analyzing results of tests and determining appropriate corrective action;
        (F) General notes on the methods of isolating equipment faults to specific printed circuit cards in the equipment;
        (G) List of typical troubles which might be encountered, together with general indications as to the probable location of each trouble;
        (H) Special office grounding requirements;
        (I) A site specific central office ground system acceptance checklist that is consistent with industry practice; and
        (J) A site specific layout of the master ground bar (MGB) showing assignment of P, A, N, and I equipment areas.
        (4) Distributing frame wire. The bidder shall provide sufficient tinned copper conductor distributing frame wire for the initial installation. The insulation of this wire shall be such that it will not support combustion. The insulation shall have good abrasion resistance and cut-through properties, exhibit good solder heat resistance, and be suitable for wire wrap connections or insulation displacement connections.
        (5) Technical assistance service. A technical assistance service shall be made available to assist the owner and its maintenance personnel on a 24-hour, 7 days a week basis. There is to be assistance available for both hardware and software problems. The necessary interface devices shall be supplied by the bidder.
        (6) Spare parts. (i) The spare parts bid price shall be based upon the required quantities of spares shown in Item 6.2 of appendix C of this section, and shall be added to the base bid for comparison purposes in awarding the bid. It is the supplier's responsibility to provide all spares required by this section. If the supplier neglects to list certain spare parts in Item 6.2 of appendix C of this section, but they are necessary to comply with this section, they shall be provided by the supplier at no additional cost to the owner.
        (A) ``Units'' are defined as user replaceable components used in the central office equipment. ``Spare Parts'' are direct replacements for units. Spare parts are necessary for the maintenance and diagnostic operations where the suspected faulty unit may be removed and a spare part substituted in anticipation that the trouble will be cleared.
        (B) Examples of units for which spare parts should be furnished are printed circuit cards; circuit pack assemblies; fuses; and power supplies.
        (C) Spare parts are not required as part of this addendum for items such as connectorized cables, nuts, bolts, and similar hardware; nor for items which can be obtained from sources other than the bidder such as battery cells, chargers, powerboards, magnetic tape transport assemblies, disk drives, ringing machines, recorded announcement machines, loop extenders and voice frequency repeaters, fire bars, teletypewriters, and video monitors.
        (D) When 100 or more like units are used in the hosts and RST's to be bid, the quantity of spares to be furnished is determined by multiplying the total number of like units in the contract by .05 or .03, as applicable, and rounding off to the next lowest integer. For example, 119 Class 1 units require five spares; 120 require six.
        (E) When alternates are required, the price of the spare parts for the alternates shall be included with the price of the alternate.
        (F) For equipment in which the line cards consist of a number of plug-in ``daughter'' boards on a ``mother'' board, the line card is defined as the ``daughter'' board unit. In a similar manner for those designs which have line cards backed up by a ``control card,'' the ``control card'' is not, by definition, a line card.
        (G) The quantities of spare parts determined in paragraph (x)(6)(vi) of this section are a minimum quantity. The bidder may add quantities of spare parts to bring the number of spare parts up to the bidder's list of spare parts necessary for proper operation in the field.
        (ii) A Class 1 unit does not have automatic transfer to a redundant or standby pool of identical units, and provides any function for 24 or more lines or trunks or for all trunks in a group. Nonredundant digital trunk interfaces are included in this category.
        (iii) A Class 2 unit has automatic transfer to a redundant or standby pool of identical units, and provides any function for 24 or more lines or trunks or for all trunks in a group. Redundant digital trunk interfaces and units of a redundant stored program processor are included in this category.
        (iv) A Class 3 unit does not have automatic transfer to a redundant or standby pool of identical units and provides any function for no more than 23 lines or trunks or for less than all trunks in a group. Nonredundant analog trunks are included in this category. Excluded from this category are line cards, which are in Class 4.
        (v) A Class 4 unit has automatic transfer to a redundant or standby pool of identical units and provides any function for no more than 23 lines or trunks or for less than all trunks in a group. Also, any line cards are in Class 4.
        (vi) The spare parts for all of the hosts and the RST's included
(TABLE START)in this contract shall be provided as follows:
@h1Quantity of Units used in the CO's & RST's To Be Bid@h2Class  -  -  -
@h1Required Quantity of Spares By Class of Unit@h21@h22@h23@h24
        1 through 9  .... 1  .... 1  .... 0  .... 0
        10 through 24  .... 2  .... 2  .... 1  .... 0
        25 through 49  .... 3  .... 2  .... 2  .... 0
        50 through 99  .... 4  .... 3  .... 2  .... 0
        100 or More  .... 5%  .... 3%  .... 3%  .... 0
(TABLE END)
        (vii) As a part of the response to the bid, the supplier shall furnish a list of units used by class and a list of spare parts to be furnished with this contract. This list shall be placed in Item 6.2 of appendix C of this section for only one of the host specifications included in the entire contract.
        (7) Environmental requirements. The bidder shall specify the environmental conditions necessary for safe storage and satisfactory operation of the equipment being bid. If requested, the bidder shall assist the owner in planning how to provide the necessary environment for the equipment.
        (8) Unit costs for cost separation purposes. The successful bidder shall present a cost breakdown of the central office equipment on a discrete element basis 90 days after installation completion. This shall include the various frames, switching and transmission components, and software.
        (9) Single-point grounding system acceptance. Qualified representatives of the central office system supplier and the owner are to conduct a thorough joint acceptance audit of the grounding system prior to the central office being placed into service. A grounding system acceptance checklist provided by RUS, which is consistent with standard industry practice, will be used in conducting this audit. All required grounding system corrections are to be made prior to placing the central office system into full service operation. The successful completion of this grounding system audit will constitute an acceptance on the part of both parties, the owner and the central office supplier (refer to paragraph (y)(5) of this section, and appendix D of this section).
        (y) Installation. The following responsibilities apply to the central office equipment installation and Remote Switching Terminal (RST) installations, unless otherwise noted.
        (1) Responsibilities of owner. The owner shall:
        (i) Allow the bidder and its employees free access to the premises and facilities at all hours during the progress of the installation;
        (ii) Take such action as necessary to ensure that the premises are dry and free from dust and in such condition as not to be hazardous to the installation personnel or the material to be installed (not required for an RST installed in a self-contained environmentally controlled cabinet);
        (iii) Provide heat or air conditioning when required and general illumination in rooms in which work is to be performed or materials stored (not required for an RST installed in a self-contained environmentally controlled cabinet);
        (iv) Provide suitable openings in buildings to allow material to be placed in position (not required for an RST installed in a self-contained environmentally controlled cabinet);
        (v) Provide the necessary conduit and commercial and dc-ac inverter output power to the locations shown on the approved floor plan drawings; provide 120 volts, 60 Hz commercial power equipped with a secondary arrester and a reasonable number of outlets for test, maintenance and installation equipment; provide suitable openings or channels and ducts for cables and conductors, from floor to floor and from room to room; provide an acceptable central office grounding system and at a ground resistance level that is reasonable for office site conditions (not required for an RST installed in a self-contained environmentally controlled cabinet);
        (vi) Provide the necessary wiring, central office grade ground and commercial power service, with a secondary arrester, to the location of an exterior RST installation based on the voltage and load requirements furnished by the bidder;
        (vii) Test at the owner's own expense all lines and trunks for continuity, leakage and loop resistance and ensure that all lines and trunks are suitable for operation with the central office equipment specified;
        (viii) Make alterations and repairs to buildings necessary for proper installation of material, except to repair damage for which the bidder or its employees are responsible;
        (ix) Connect outside cable pairs on the distributing frame and run all line and trunk jumpers (those connected to protectors);
        (x) Furnish all trunk, line, and party assignment information to permit the bidder to program the data base memory within a reasonable time prior to final testing;
        (xi) Release for the bidder's use such portions of the existing plant as are necessary for the proper completion of such tests as require coordination with existing facilities including facilities for T1 span lines with properly installed repeaters between the central office and the RST installations;
        (xii) Make prompt inspections as it deems necessary when notified by the bidder that the equipment, or any part of the equipment, is ready for acceptance;
        (xiii) Provide and install adequate fire protection apparatus, including one or more fire extinguishers or fire extinguishing systems of the gaseous type that has low toxicity and effect on equipment; and
        (xiv) Provide necessary access ports for cable, if underfloor cable is selected.
        (2) Responsibilities of bidder. The bidder shall:
        (i) Allow the owner and its representatives access to all parts of the buildings at all times during the installation;
        (ii) Obtain the owner's permission before cutting into or through any part of the building structure such as girders, beams, concrete or tile floors, partitions or ceilings (not applicable to the installation of lag screws, expansion bolts, and similar devices used for fastening equipment to floors, columns, walls and ceilings);
        (iii) Be responsible for reporting to the owner any damage to the building which may exist or may occur during its occupancy of the building, repairing all damage to the building due to carelessness of the bidder's workforce, and exercising reasonable care to avoid any damage to the owner's property;
        (iv) Consult with the owner before cutting into or through any part of the building structure where the fireproofing or moisture proofing may be impaired;
        (v) Take necessary steps to ensure that all fire fighting apparatus is accessible at all times and all flammable materials are kept in suitable places outside the building;
        (vi) Not use gasoline, benzene, alcohol, naphtha, carbon tetrachloride or turpentine for cleaning any part of the equipment;
        (vii) Install the equipment in accordance with the specifications for the office;
        (viii) Run all jumpers, except line and trunk jumpers (those connected to protectors);
        (ix) Establish and update all data base memories with subscriber and trunk information as supplied by the owner until an agreed turnover time;
        (x) Give the owner notice of completion of the installation at least 1 week prior to completion;
        (xi) Permit the owner or its representative to conduct tests and inspections after installation has been completed in order that the owner may be assured that the requirements for installation are met;
        (xii) Allow access, before turnover, by the owner or its representative, upon request, to the test equipment which is to be turned over as a part of the office equipment, to permit the checking of the circuit features which are being tested and to permit the checking of the amount of connected equipment to which the test circuits have access;
        (xiii) Make final charger adjustments using the manufacturer's recommended procedure;
        (xiv) Notify the owner promptly of the completion of work of the central office, or such portions as are ready for inspection;
        (xv) Correct promptly all defects for which the bidder is responsible;
        (xvi) Provide the owner with one set of marked prints, or strapping prints, showing which of the various options and figures are in use on each switching system as specified in paragraph (x)(3)(i) of this section;
        (xvii) Place the battery in service in compliance with the recommendations of the battery manufacturer; and
        (xviii) Furnish the owner with a record of the cell voltages and specific gravity readings made at the completion of the installation of the switching system and before it is placed in commercial service.
        (3) Installation requirements. (i) All work shall be done in a neat, workmanlike manner. Equipment frames or cabinets shall be correctly located, carefully aligned, anchored and firmly braced. Cables shall be carefully laid with sufficient radius of curvature and protected at corners and bends to ensure against damage from handling or vibration. Exterior cabinet installations for RST's shall be made in a permanent, eye-pleasing manner.
        (ii) All multiple and associated wiring shall be continuous, free from crosses, reverses and grounds and shall be correctly wired at all points.
        (iii) An inspection shall be made by the owner or its representatives prior to performing operational and performance tests on the equipment. However, this inspection shall be made after all installing operations which might disturb apparatus adjustments have been completed. The inspection shall be of such character and extent as to disclose with reasonable certainty any unsatisfactory condition of apparatus or equipment. During these inspections, or inspections for apparatus adjustments, or soldering, or in testing of equipment, a sufficiently detailed examination shall be made throughout the portion of the equipment within which such condition is observed, or is likely to occur, to disclose the full extent of its existence, where any of the following conditions are observed:
        (A) Apparatus or equipment units failing to compare in quantity and code with that specified for the installation;
        (B) Apparatus or equipment units damaged or incomplete;
        (C) Apparatus or equipment affected by rust, corrosion or marred finish; or
        (D) Other adverse conditions resulting from failure to meet generally accepted standards of good workmanship.
        (4) Operational test requirements. (i) Operational tests shall be performed on all circuits and circuit components to ensure their proper functioning in accordance with appropriate applicable documents supplied by the bidder.
        (ii) A sufficient quantity of overall tests shall be made to ensure proper operation of all specified features.
        (iii) A sufficient quantity of locally originating and incoming calls shall be made to prove the switching system can accept and process calls to completion.
        (5) Grounding system audit. (i) A grounding system audit shall be performed to ensure that a viable single-point grounding system is in place prior to the time the switching system is placed into full service operation. It is suggested that such an audit be conducted at the time the switching system is ready for turnover to the owner.
        (ii) This single-point grounding system audit is to be conducted by authorized representatives of the supplier and owner, and with the RUS general field representative participating at his discretion.
        (iii) The single-point grounding system audit is to be conducted using the checklist contained in appendix D of this section.
        (iv) Appendix D of this section shall be the principal single-point grounding system audit guideline document. A supplemental checklist may be prepared and provided by the switching system supplier which recognizes unique grounding requirements related to their particular switching system. The scope of this supplier checklist is to be confined to unique and specific switching system requirements only. Acceptable supplier supplemental grounding checklist must have prior approval of and be on file with the Central Office Equipment Branch of the Telecommunications Standards Division of RUS.
        (v) It is the responsibility of the central office supplier to ensure that the grounding system evaluation criteria contained in the combination of the appendix D checklist of this section and their optional supplemental checklist adequately fulfill requirements for warranty coverage.
        (vi) All deficiencies in the single-point grounding system are to be corrected prior to the switching system being placed into full service operation. Exceptions are permitted only by mutual agreement of the owner and supplier and with written approval of the RUS general field representative.
        (vii) The acceptance statement facesheet of the audit checklist in appendix D of this section shall be signed by authorized representatives of the supplier and owner to indicate mutual approval of the single-point grounding system. Copies of all completed grounding system audit documents are to be provided to the supplier, owner and appropriate RUS telephone program regional offices.
(The information and recordkeeping requirements of this section have been approved by the Office of Management and Budget (OMB) under the control number 0572 - 0059)
Appendix A to 7 CFR 1755.522 -- Specification for Digital, Stored Program Controlled Central Office Equipment Detailed Requirements (Host)
(Information To Be Supplied by Owner)
Telephone Company Name
_
Location
_
Central Office Name (By Location)
Town
County
State
XXXXAttended
XXXXUnattended
XXXXRemotes
1. General
        1.1 Notwithstanding the bidder's equipment lists, the equipment and materials furnished by the bidder must meet the requirements of paragraphs (a) through (x), Appendix A and Appendix B of _1755.522.
        1.2 Paragraphs (a) through (x) of _1755.522 cover the minimum general requirements for digital, stored program controlled central office switching equipment.
        1.3 Paragraph (y) of _1755.522 covers requirements for installation, inspection, and testing when such service is included as part of the contract.
        1.4 Appendices A and B of _1755.522 cover the technical data for application engineering and detailed equipment requirements insofar as they can be established by the owner. These appendices are to be filled in by the owner.
        1.5 Appendix C of _1755.522 covers detailed information on the switching network equipment and the common control equipment, and information as to system reliability and heavy traffic delays as proposed by the bidder. This appendix is to be filled in by the bidder and must be presented with the bid.
        1.6 Appendix D of _1755.522 is the single-point grounding system audit checklist.
2. Numbering Scheme
        2.1 This office shall be arranged to serve the following area and office code(s):
_
_
_
_
        If more than one code is to be served, discrimination shall be determined by the following:
Number Translation XX
Separate Trunk Groups XX
Both (Explain in Item 16, Appendix A) XX
        2.2 This office shall be arranged to provide EAS service to the
(TABLE START)following:
@h1Connecting office
@h1Code
@h1Connecting office
@h1Code
 @rs_
 @rs_
 @rs_
 @rs_
(TABLE END)
        2.2.1 Seven digits shall be dialed for all local and EAS calls.
        2.3 Additional dialing procedures to be provided include the
(TABLE START)following:
@h1Feature
@h1Required
        Station Paid Toll (Including Coin):
        Home Numbering Plan Area (HNPA):
``1'' + 7 Digits  .... XXXXXXX
``1'' + 10 Digits  .... XXXXXXX
Other (Explain in Item 16, Appendix A)  .... XXXXXXX
Foreign Numbering Plan Area (FNPA):
``1'' + 10 Digits  .... XXXXXXX
Other (Explain in Item 16, Appendix A)  .... XXXXXXX
(TABLE END)
(TABLE START)
        10XXX Dialing to Interexchange Carriers:
@h1Name
@h1Access code
 @rs_
 @rs_
 @rs_
(TABLE START)
 @rs_
(TABLE END)
@h1Feature
@h1Required
        Person, Special (Including Coin):
HNPA -- ``0'' + 7 Digits  ....  @rn,s
``0'' + 10 Digits  ....  @rn,s
FNPA ``0'' + 10 Digits  ....  @rn,s
Other (Explain in Item 16, Appendix A)  ....  @rn,s
        Directory Assistance:
HNPA Local -- 411  ....  @rn,s
``1'' + 411  ....  @rn,s
HNPA Toll ``1'' + 555 - 1212  ....  @rn,s
FNPA Toll ``1'' + NPA + 555 - 1212  ....  @rn,s
        IDDD:
Operator Serviced 01  ....  @rn,s
(TABLE START)
Station-Station 011  ....  @rn,s
(TABLE END)
@h1Other service codes
@h1No. to be dialed
Wire Chief  ....  @rn,s
Repair Service  ....  @rn,s
Business Office  ....  @rn,s
Emergency Calls to 911 Lines  ....  @rn,s
Emergency Calls to 911 Trunks  ....  @rn,s
Time  ....  @rn,s
Weather  ....  @rn,s
100 Test Line  ....  @rn,s
102 Test Line  ....  @rn,s
105 Test Line  ....  @rn,s
Other (Explain in Item 16, Appendix A)  ....  @rn,s
(TABLE END)
        2.4 Assistance calls are answered: (Check appropriate items)
        2.4.1 At the operator office in XXXXXXXX
        2.4.1.1 By means of the regular interoffice toll trunks XXXX
        2.4.1.2 By means of the regular interoffice EAS trunks XXXX
        2.4.1.3 By means of a separate special service trunk group XXXX
        2.4.1.4 Locally XXXX
        Explain:
3. Office Clock
        3.1 This office is to be slave clock synchronized with another office:
  XXXX Yes  XXXXNo
(Explain details in Appendix A, Item 16 if ``Yes''.)
        3.2 This office is to be a master clock office to provide synchronization timing for other offices:
  XXXX Yes  XXXXNo
(Explain details in Appendix A, Item 16 if ``Yes''.)
4. Interoffice Trunking Diagram
        4.1 A sketch showing relative location of exchanges, RST's, and number of circuits shall be included, also the office and area codes of the direct trunk points. The diagram should indicate whether toll or EAS trunk groups are ``High Usage'' or ``Final.'' Alternate routes should be included. Indicate whether the trunk termination is direct digital or analog.
(TABLE START)
5. Translator Function Chart
@h1Called point
@h1Subscriber dials
@h1First route@h2Translator action@h3Deletes@h2Send@h3Prefixes@h3
@h1Alternate routes@h2Translator action@h3Deletes@h2Send@h3Prefixes@h3
 @rs_
 @rs_
(TABLE END)
        6. Line Circuit Requirements (Includes all lines associated with RST's.)
(TABLE START)
6.1 Types of Lines
@h1
@h1No. of lines@h2Local service only@h2both local and EAS service
@h1No. of EAS areas
@h1Total No. of lines required
6.1.1 Individual -- Flat Rate  .... XXXXXX  .... XXXXXX  .... XXXXXX  .... XXXXXX
6.1.2 Individual -- Message Rate  .... XXXXXX  .... XXXXXX  .... XXXXXX  .... XXXXXX
6.1.3 Pay Station  .... XXXXXX  .... XXXXXX  .... XXXXXX  .... XXXXXX
6.1.4 Telephone Company Official Lines  .... XXXXXX  .... XXXXXX  .... XXXXXX  .... XXXXXX
6.1.5 Wire Chief  .... XXXXXX  .... XXXXXX  .... XXXXXX  .... XXXXXX
6.1.6 911 Emergency Service Bureau Lines  .... XXXXXX  .... XXXXXX  .... XXXXXX  .... XXXXXX
6.1.7 Number Hunting PBX Groups:  .... XXXXXX  .... XXXXXX
(TABLE START) .... XXXXXX  .... XXXXXX
(TABLE END)
@h1No. of lines in group
@h1No. of groups
@h1Direct in dial*
@h1Restricted service at COE
@h1Type@h2Ground start@h2Loop start
@h1No. of lines@h2Local service only@h2Both local and EAS service
@h1No. of EAS areas
@h1Total No. of lines required
XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX
XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX
XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX
XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX
XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX  .... XXX
Footnote: *Furnish translation information under Item 5.
(TABLE END)
6.1.8 WATS Lines (Give details in Appendix A, Item 16)
Number of Inward WATS Lines XXXX
Number of Outward WATS Lines XXXX
6.1.9 Special Lines Required XXXX (Explain in Item 16, Appendix A)
6.1.10 Total Number of Lines Required
Host XXX (Incl. DDI Concentrator Lines)
RST 1 XXX
RST 2 XXX
RST 3 XXX
Total XXX
6.1.11 Total Director Numbers Required XXX
(Including RST's) (see Item 7.1, Appendix A)
6.1.12 Pay Station
Type XXXXXX
New XX    Reused XX
(Describe in Item 16, Appendix A)
6.1.13 Line Concentrator
6.1.13.1 Supplied by Owner (see Item 16, Appendix A, for details)
XX Yes    XX No
6.1.13.2 Supplied by Bidder (If ``Yes'', attach REA Form 397g, Performance Specification for Line Concentrators)
XX Yes    XX No
6.2. Data on Lines Required Range Extension
6.2.1 Number of non-pay station lines having a loop resistance, including
(TABLE START)the telephone set, as follows:
@h1
@h1
   .... @oi0No. of lines
1901 - 3200 ohms  .... XXX
3201 - 3600 ohms  .... XXX
(TABLE END)
6.2.2 Number of pay station lines having loop resistance, excluding the
(TABLE START)telephone set, greater than:
@h1
@h1
   .... @oi0No. of lines
1200 ohms (For Prepay)  .... XXX
1000 ohms (For Semi-Postpay Operation)  .... XXX
(TABLE END)
6.2.3 Range extension equipment is to be provided:
6.2.3.1 Loop Extenders: Total Quantity XXX
By Bidder -- Quantity XXX
By Owner -- Quantity XXX
(Explain in Item 16, Appendix A)
6.2.3.2 VF Repeaters: Total Quantity XXX
By Bidder -- Quantity XXX
(Bidder must have information on loading and cable size.)
By Owner -- Quantity XXX
(Explain in Item 16, Appendix A)
6.2.3.3 Range extension may be furnished as an extended range line circuit at the option of the supplier. If this option is used, the quantities of loop extenders and VF repeaters will be different from the quantities listed above (see Item 6.1,a, Appendix C).
XX Yes    XX No
7. Traffic Data-Line Originating and Terminating Traffic
7.1 Originating Line Traffic -- Estimated per Busy Hour (Includes all
(TABLE START)Lines Associated With RST's):
@h1
@h1(a) CCS per Main Station
@h1(b)No. of Main Stations
@h1(axb)Total CCS
@h1No. of Lines Required\1\
Ind. -- Res .... XXXXX .... XXXXX .... XXXXX .... XXXXX
Ind. -- Bus .... XXXXX .... XXXXX .... XXXXX .... XXXXX
Special Lines .... XXXXX .... XXXXX .... XXXXX .... XXXXX
Pay Station .... XXXXX .... XXXXX .... XXXXX .... XXXXX
Telco Official .... XXXXX .... XXXXX .... XXXXX .... XXXXX
Wire Chief .... XXXXX .... XXXXX .... XXXXX .... XXXXX
No. Htg. or PBX .... XXXXX(\2\) .... XXXXX(\3\) .... XXXXX .... XXXXX
WATS .... XXXXX .... XXXXX .... XXXXX .... XXXXX
Data Service .... XXXXX .... XXXXX .... XXXXX .... XXXXX
911 Emerg. Service .... XXXXX .... XXXXX .... XXXXX .... XXXXX
Total .... @l .... XXXXX .... XXXXX .... XXXXX(\4\)@rn,n,s_
  ....  .... @oi0(c) .... @oi0(d) .... @oi0(e)
Footnote: \1\See Appendix A, Item 6.1.
Footnote: \2\This figure is the CCS per PBX trunk.
Footnote: \3\This figure is the number of PBX trunks.
Footnote: \4\This is the total number of line equipments required. The number to be provided will be determined by the equipment design of the system of the selected bidder. See Appendix C, Item 3.1.1.2.
(TABLE END)
7.2 Average Originating CCS per Line per Busy Hour
(d)/(e)=XX/ XX=XX CCS/Line
This office shall be engineered to handle an initial average originating busy hour traffic of XX CCS per line. It is anticipated that the average originating busy hour traffic will increase to XX CCS per line.
Originating Traffic Attributed to Host Only XX CCS/Line
7.3 Terminating Traffic -- Estimated CCS per Busy Hour
It is assumed that the total CCS for terminating traffic is the same as for originating traffic. Since digital switch networks are on a terminal per line basis, the terminating CCS per line will be the same as the originating CCS per line as shown in Item 7.2, Appendix A.
Terminating Traffic Attributed to Host Only XX CCS/Line
7.4 Percent of Pushbutton Lines XX
7.5 Anticipated Ultimate Capacity (20 years)
7.5.1 Subscriber Lines
Host XXXX (Incl. DDI Concentrator Lines)
RST 1 XXXX
RST 2 XXXX
RST 3 XXXX
Total XXXX
8. Trunk Circuit Requirements
        8.1 Interoffice Trunking
(TABLE START)
        8.1.1 Trunking Requirements
@h1
@h1
@h1
@h1
@h1
1. Connecting Office ....  ....  ....  ....
2. Use of Trunk ....  ....  ....  ....
3. Trk. Grp. Ntwk. Connection1 ....  ....  ....  ....
4. Quantity Equipped ....  ....  ....  ....
5. Ultimate % Growth ....  ....  ....  ....
6. CCS Capacity ....  ....  ....  ....
7. Direction ....  ....  ....  ....
8. No. Digits Dialed ....  ....  ....  ....
9. No. Digits Outpulsed ....  ....  ....  ....
10. No. Digits Inpulsed ....  ....  ....  ....
11. Type Signaling ....  ....  ....  ....
12. Type Pulsing ....  ....  ....  ....
13. Carrier Type (2-Wire) ....  ....  ....  ....
14. Carrier Type (4-Wire) ....  ....  ....  ....
15. Physical ....  ....  ....  ....
16. Repeat Coils2 ....  ....  ....  ....
17. DX Signaling Set ....  ....  ....  ....
18. Other Type Signaling ....  ....  ....  ....
19. Delay Dial ....  ....  ....  ....
20. Direct Digital Interface ....  ....  ....  ....
21. a. Feature Group B ....  ....  ....  ....
b. Feature Group C ....  ....  ....  ....
c. Feature Group D ....  ....  ....  ....
Footnote: 1Designation of trunk group network connection involves the following categories:
Footnote: IC -- Direct Inter-LATA Connecting Trunk=(IC/POP)
Footnote: TC -- Tandem Connecting Trunks
Footnote: IT -- Intertandem Connecting Trunks
Footnote: IL -- Intra-LATA Connecting Trunks
Footnote: TIC -- Tandem Inter-LATA Connecting Trunks
Footnote: Misc. -- Intercept, Busy Verification, etc.
Footnote: 2Omit repeating coils for carrier derived trunks.
(TABLE END)
        8.1.2 Pads for 4-Wire Carrier (7dB and 16dB)
Total Quantity XXX
By Bidder Quantity XXX
By Owner Quantity XXX
        Refer to the attached information regarding connecting company trunk circuit drawing numbers and name of manufacturer.
        8.2 Switched Traffic Data
(TABLE START)
        8.2.1 Originating Traffic
@h1Type
@h1CCS
@h1H.T. secs.
@h1BHC
@h1No. of digits out-pulsed
@h1Sender sig. mode
@h1Remarks
Toll ``0''\1\  ....   ....   ....   ....   ....   ....
Toll ``0''+7\1\\2\  ....   ....   ....   ....   ....   ....
Toll ``0''+10\1\\2\  ....   ....   ....   ....   ....   ....
Toll S - S ``1''+7\2\  ....   ....   ....   ....   ....   ....
Toll S - S ``1''+10\2\  ....   ....   ....   ....   ....   ....
Toll Other  ....   ....   ....   ....   ....   ....
Special Service  ....   ....   ....   ....   ....   ....
Intercept  ....   ....   ....   ....   ....   ....
Intraoffice  ....   ....   ....   .... XXXXXXX  .... XXXXXXX  ....
EAS  ....   ....   ....   ....   ....   ....
EAS  ....   ....   ....   ....   ....   ....
EAS  ....   ....   ....   ....   ....   ....
Tandem  ....   ....   ....   ....   ....   ....
Tandem  ....   ....   ....   ....   ....   ....
Tandem  ....   ....   ....   ....   ....   ....
911 Emerg. Service  ....   ....   ....   ....   ....   ....  @rn,s_
Total  ....   ....   ....   ....   ....   ....
Footnote: \1\PPCS traffic assumed to be divided 20 percent ``0'' and 80 percent ``0''+ if unknown.
Footnote: \2\Toll calls assumed to be divided two-thirds 7 digits and one-third 10 digits.
(TABLE END)
Busy Hour Attempts=BHC Total 0A 1.4=XX
(TABLE START)
        8.2.2 Terminating Traffic
@h1Type
@h1CCS
@h1H.T. secs.
@h1BHC
@h1No. of digits inpulsed
@h1Receiver sig. mode
@h1Remarks
Toll Compl.  ....   ....   ....   ....   ....   ....
Test & Ver.  ....   ....   ....   ....   ....   ....
Intraoffice  ....   ....   ....   ....   ....   ....
EAS  ....   ....   ....   ....   ....   ....
EAS  ....   ....   ....   ....   ....   ....
EAS  ....   ....   ....   ....   ....   ....
Tandem  ....   ....   ....   ....   ....   ....
Tandem  ....   ....   ....   ....   ....   ....
Tandem  ....   ....   ....   ....   ....   .... @rn,s_
Total  ....   ....   ....   ....   ....   ....
(TABLE END)
(TABLE START)
9. Checklist of Features Required
@h1
@h1
9.1 Alternate Routing  ....
(Explain in Item 16, Appendix A)
9.2 Data Service  ....
(Explain in Item 16, Appendix A)
9.3 This office shall be:
9.3.1 End Office Only  ....
9.3.2 End Office and Intermediate Tandem  ....
(Explain in Item 16, Appendix A)
9.3.3 End Office and Access Tandem  ....
(Explain in Item 16, Appendix A)
(TABLE END)
(TABLE START)
        9.4 Billing Data
@h1
@h1Trunk group
@h1Send ANI feature group@h2B@h2C@h2D
@h1Store billing data@h2AMA system@h2Pollable system
9.4.1 This office only ....  ....  ....  ....  ....  ....
9.4.2 Trunks from Tributaries ....  ....  ....  ....  ....  ....  @rs_@s4
9.4.3 Local Message Detail Recording:@s0
(TABLE END)
        9.5 Pollable Systems
        9.5.1 Polling device to be provided on this contract
XX Required
XX Not Required
(Provide details in Item 16, Appendix A)
        9.5.2 Pollable system to be backed up by tape or disc standby
XX Required
XX Not Required
9.6 AMA Format
        9.6.1 Bellcore Format
XXRequired
XX Not Required
(Provide details in Item 16, Appendix A)
10. Miscellaneous Operating Features
10.1 Busy Verification
10.1.1 By dedicated trunk from toll operator: XX
10.1.1.1 One-Way, Inward XX
10.1.1.2 Two-Way (Busy verification inward, intercept outward) XX
10.1.2 By prefix digit over intertoll trunk XX
(Indicate digit(s) dialed) XX
10.1.3 Access by Switchman
10.1.3.1 Dedicated Trunk XX
10.1.3.2 Multiple of Operator Trunk XX
10.2 Intercept Facilities
10.2.1 Vacant code, disconnected number, and unassigned number intercept shall be: (Check One)
By recorded announcement:
Without cut-through to operator XX
With cut-through to operator XX
By operator XX
10.2.2 Changed number intercept shall be: (Check One)
By recorded announcement:
Without cut-through to operator XX
With cut-through to operator XX
By operator XX
By automatic intercept system (AIS) in distant office XX
10.2.3 Method of Reaching Operator, if required:
Separate trunk group XX
Regular interoffice toll trunks with idle trunk selecting over at least three trunks when three or more toll trunks are equipped XX
10.2.4 Number of separate intercept trunk circuits XX
10.3 Line Load Control
10.3.1 Line load control facilities are:
XX Required  XX Not Required
(Explain in Item 16, Appendix A)
10.4 Service Observing Facilities
10.4.1 Service observing facilities are:
XX Required  XX Not Required
(Explain in Item 16, Appendix A)
10.5 Hotel-Motel Arrangements
10.5.1 Hotel-motel arrangements for operation of message registers at the subscriber's premises are:
XX Required  XX Not Required
(Explain in Item 16, Appendix A)
10.5.1.1 How are message registers to be activated?
Line Reversal XX
Third Wire XX
Other XX
(Explain in Item 16, Appendix A)
10.6 Nailed-Up Connections
XX Required  XX Not Required
(Explain in Item 16, Appendix A)
(TABLE START)
10.7 Vertical Services: (RST Lines are Included)
@h1
@h1Initially
@h1Ultimate
10.7.1 Call Waiting -- No. of Lines .... XXXXXX .... XXXXXX
10.7.2 Call Forwarding -- No. of Lines .... XXXXXX .... XXXXXX
XXLocal  XXRemote@xl ....   ....
(Explain in Item 16, Appendix A)
10.7.3 Abbreviated Dialing No. of Lines .... XXXXXX .... XXXXXX
No. of Codes per Line XXfor XXLines@xl  ....   ....
No. of Codes per Line XXfor XXLines@xl  ....   ....
10.7.4 Three-Way Calling -- No. of Lines .... XXXXXX .... XXXXXX
CCS Per Line  .... XXXXXX .... XXXXXX
(TABLE END)
10.7.5 Other XX
(Explain in Item 16, Appendix A)
        11. Maintenance Facility Requirements
        11.1 Alarm Signals
        11.1.1 Handled locally XX
Explain in Detail:
_
_
        11.1.2 Transmitted to attended point
        11.1.2.1 Via operator office trunks XX
        11.1.2.2 Via printout or other display service XX
Explain in Detail:
_
_
        11.1.2.3 Type of tone to operator
        11.1.2.3.1 Distinctive tone (see (i)(2)(ix) of _1755.522) XX
        11.1.2.3.2 Other
Explain in Detail:
_
_
(TABLE START)
        11.1.3 Alarm checking signals for carrier and mobile radio systems
@h1
@h1
11.1.3.1 Minor Alarm  ....
11.1.3.2 Major Alarm  ....
11.1.3.3 Terminals for both  ....
11.2 Trouble Location and Test
11.2.1 Outside plant and stations (check desired items)
11.2.1.1 Subscriber's loop test circuit:
11.2.1.1.1 As part of the maintenance center  ....
11.2.1.1.2 Separately  ....
11.2.1.2 Remote test set (Explain in Item 16, Appendix A)  ....
11.2.1.3 Dial speed test circuit (Explain in Item 16, Appendix A)  ....
11.2.1.4 Pushbutton dialing test circuit  ....
11.2.1.5 Howler (per (o)(2)(iii)(C) of _1755.522)  ....
11.2.1.6 Hand test sets, number required XX (Explain in Item 16, Appendix A)
(TABLE END)
11.3 Transmission Tests
        11.3.1 Furnish reference tone
Yes XX
(TABLE START)
No XX
@h1Frequencies and order in which applied
@h1Time interval for application of each frequency
XX Hz .... XX Seconds
XX Hz .... XX Seconds
XX Hz .... XX Seconds
XX Hz .... XX Seconds
(TABLE END)
11.3.2 Test Lines
11.3.2.1 Test Line 100 XX
11.3.2.2 Test Line 102 XX
11.3.2.3 Test Line 104 XX
11.3.2.4 Test Line 105 XX
(Explain in Item 16, Appendix A)
11.3.2.5 Test Line 107 XX
11.3.2.6 Remote Office Test Line XX
 (Explain in Item 16, Appendix A)
11.4 Line Testing
11.4.1 Automatic line insulation testing
Yes XX
No XX
11.4.2 Owner supplied equipment
Yes XX
No XX
11.4.2.1 Vendor supplied interface only
Yes XX
No XX
        If supplied by owner, explain in Item 16, Appendix A, including manufacturer, model, location.
11.5 Remote Control
11.5.1 Remote control of the system shall be provided.
Yes XX
No XX
        If required, explain in Item 16, Appendix A, including number, type and location.
12. Power Equipment Requirements (Host Office Only)
12.1 Central Office Battery
        12.1.1 A battery reserve of XX busy hours shall be provided for this office when it reaches XX lines at the ultimate anticipated traffic rates specified in Item 7.2, Appendix A.
        12.1.1.1 The owner will furnish a standby generator, permanently installed in this office, with capacity sufficient to power air conditioning equipment required for cooling of the central office equipment and to maintain an adequate dc supply in the event of a failure of the commercial ac supply.
Yes XX
No XX
        12.1.2  Type of battery: (Check One)
Lead Calcium XX
Lead Antimony XX
        12.1.3 Voltmeter (portable 3 - 60 - 150 volt scale, 1% accuracy) shall be furnished.
Yes XX
No XX
        12.1.4 Hydrometer in a hydrometer holder with glass or plastic drop cup shall be furnished.
Yes XX
No XX2112.1.5 Type of battery rack required: (Check One)
Two Tier XX
Other XX
Explain:
        12.1.6 Special equipment power requirements (carrier, voice frequency repeaters, etc.). Drain in amperes XX
        12.1.6.1 Supply all necessary equipment to provide the following
(TABLE START)48-volt battery taps:
@h1Number of circuits
@h1Fuse (or circuit breaker) size
 .... @l
 .... @l
 .... @l
 .... @l
(TABLE END)
12.2 Charging Equipment
        12.2.1 Charging equipment shall be provided capable of charging the office battery on a full float basis when the office reaches XX lines at the ultimate anticipated traffic rates specified in Item 7.2, Appendix A.
(TABLE START)
        12.2.2 Charger input rating shall be:
@h1
@h13-Phase Connection:
Voltage XX  .... 3 - Wire XX
Phase XX  .... 4 - Wire XX
Frequency XX  .... Delta XX
  .... Y XX
(TABLE END)
12.3 Ringing Equipment
        12.3.1 Solid-state ringing equipment in accordance with paragraph (s)(5)(i) of _1755.522 shall be provided for generating the frequencies specified by check marks in the following table. Ringing generator sets serving the entire office shall each be sized to carry the full office ringing load when the office size reaches XX lines at the ultimate anticipated traffic rates specified in Item 7.2, Appendix A.
(TABLE START)
        12.3.2 Ringing frequencies to be supplied:
@h1
@h1Frequency in Hz
@h1
@h1Maximum No. of telephones
Single Frequency  .... 20 ....  ....
Decimonic  .... 20 ....  ....
   .... 30  ....  ....
   .... 40  ....  ....
   .... 50  ....  ....
Harmonic  .... 16\2/3\  ....  ....
   .... 25  ....  ....
   .... 33\1/3\  ....  ....
   .... 50  ....  ....
Synchromonic  .... 20  ....  ....
   .... 30  ....  ....
   .... 42  ....  ....
   .... 54  ....  ....
(TABLE END)
        12.3.3 Furnish frequency meter (accurate within 1.3 Hz) and voltmeter (5% accuracy) for ringing measurements (see paragraph (s)(7)(ii) of _1755.522). Check One:
Panel Mounted XX
Portable XX
Not Required XX
12.4 Power Board
        The power panel and associated wiring shall be of ample size to meet the load requirements when this office reaches XX lines at the ultimate anticipated traffic rates specified in Item 7.2, Appendix A.
(TABLE START)
13. Distributing Frame Requirements (Host Office Only)
@h1
@h1
13.1 Total number of outside plant cable pairs to be terminated  ....
13.1.1 Gauge of outside plant cable pairs  ....
13.2 Number of outside plant cable pairs to be protected  ....
13.3 Number of additional protector pair units to be provided on MDF  ....
(TABLE END)
Explain:
13.4 Main Frame Details
        Is present MDF to be reused?
Yes XX
No XX
        If ``Yes,'' Type XX
        Reused protectors are:
XX (Mfgr.)
XX (Type)
        13.4.1 Number of pairs of arrester units (switching equipment) XX
        13.4.2 Number of pairs of gas tube arrester units (special equipment) XX
        13.4.2.1 Gas tubes to be:
XXlight,
XXmedium,
XXheavy,
XXmax. duty units
        13.4.2.2 Fail shorted/low breakdown failure mode required
Yes XX
No XX
        13.4.2.3 Breakdown voltage of gas tube arresters XX
        13.4.3 Number of terminated pairs to be grounded XX
        13.4.4 Factory assembled tip cable
Yes XX
No XX
        13.4.4.1 Tip cable length [if other than 20 feet (610 cm)]
XX
        13.4.4.2 Tip cable formed
Up XX
Down XX
        13.4.5 Pairs per vertical XX
        13.4.6 Height of vertical XXfeet XX inches
14. Building and Floor Plan Information (Host Office Only)
        14.1 Equipment is to be installed in an existing building (Attach detailed plan.) XX
        14.2 A new building is planned XX
        14.2.1 Tentative plan (Note to Engineer: Show sketch without dimensions.)
        14.3 Detailed Arrangements
        14.3.1 Partition required (to isolate space containing battery, charger, power board, test panel, main distributing frame and subscriber's loop test circuit (wire chief's test desk) from that of the remaining equipment).
Yes XX
No XX
        14.3.2 Vestibule required
Yes XX
No XX
        14.3.3 Cable entrance
OverheadXX
Underground XX
        14.3.4 Additional floor space will be required for the following equipment which is being furnished by the owner or by the connecting company:
_
_
_
        14.3.5 The office will be arranged for
 Overhead Interbay Cabling XX
 Underfloor (Computer Room Type) Interbay Cabling XX
        14.3.6 Is earthquake bracing required?
Yes XX
No XX
        (If ``Yes,'' explain zone and criteria used for zone in Item 16, Appendix A.)
        14.3.7 Office ground will be XX ohms or less (Refer to Item 4.6.3 of RUS TE&CM 810.)
        14.3.8 The office is considered to be in the following category for lightning damage probability based on the Figure 1 map of RUS TE&CM 823 (see paragraph (u)(2) of 1755.522).
XXVery High
XXHigher than Average
XXAverage
XXLower than Average
XXVery Low
        14.3.9 The following is additional information regarding operating environment conditions which should be considered in determining system protection requirements (tower in vicinity, high exposure, etc.):
15. Alternate Requests
16. Explanatory Notes (Include a detailed description of any equipment to be reused, or otherwise supplied by the owner, loop extenders, subscriber carrier, VF repeaters, etc.)
Appendix B to 7 CFR 1755.522 -- Detailed Information on Remote Switching Terminals (RST's)
(Complete One Form For Each RST)
1. Number of Subscriber Lines (These lines included in totals in Item 6, Appendix A).
        1.1 Single-Party: XXXX Flat Rate XXXX Message Rate.
        1.2 Two-Party: XXXX Flat Rate XXXX Message Rate.
        1.3 Four-Party: XXXX Flat Rate.
        1.4 Semi-Postpay Pay Station XXXX.
        1.5 Prepay Pay Station XXXX.
        1.6 PABX Lines XXXX Loop StartXXXX Ground Start XXXX Restricted at Office XXXX Other XXXX
(Describe in Item 12, Appendix B)
        1.7 Number of lines to be pushbutton XXXXXXXX
        1.8 911 Emergency Lines XXXX
        1.9 Anticipated ultimate capacity (20 - Year) XXXX
2. Traffic
        2.1 Originating traffic per line -- CCS/BH: XXXX Initial XXXX Ultimate.
        2.2 Terminating traffic per line -- CCS/BH: XXXX Initial XXXX Ultimate
        2.2.1 Terminating will be made equal to originating if it is not known to be different.
3. Subscriber Loop Resistance
        3.1 Number of subscriber lines having loop resistance, including the telephone set of:
No. of Lines
1501 - 1900 Ohms XXXXX
1901 - 3200 Ohms XXXX
        3.2 Number of pay station lines having loop resistance, excluding the telephone set, greater than:
No. of Lines
1200 Ohms (For Prepay) XXXXXX
1000 Ohms (For Semi-Post Pay Operation) XXXXX.
4. Range Extension
        4.1 If no standby power is available at the site, loop extenders may be required on 1501 to 1900 ohms loops.
        4.2 Loop extenders: Total Quantity XXXXXBy Bidder -- Quantity XXXXBy Owner -- Quantity
(Explain in Item 12, Appendix B)
4.3 VF repeaters: Total Quantity XXXXX By Bidder -- Quantity XXXXX By Owner -- Quantity XXXXX.
(Explain in Item 12, Appendix B)
5. Power Supply
        5.1 Power Board.
        5.1.1 The power board and associated wiring shall be of ample size to meet the load requirements when this RST reaches XXXXlines at the ultimate anticipated traffic rates specified in Item 2, Appendix B.
        5.2 Charger input rating shall be: Voltage XXXXXPhase XXXXXFrequency XXXXX
3-Phase Connection:
3-Wire XXXXX
4-Wire XXXXX
Delta XXXXX
YXXXXX
        5.2.1 Charger shall be capable of charging the RST battery on a full float basis when the RST reaches XXXX lines at ultimate traffic rate specified in Item 2, Appendix B.
        5.2.2 Charger shall be redundant XXXX.
        5.3 Battery reserve shall be XXXX busy hours when the RST reaches XXXX lines at the ultimate anticipated traffic specified in Item 2, Appendix B.
        5.4 Standby power is available. Yes XXX No XXX.
        5.5 Special equipment power requirements XXXX amps.
        5.6 Ringing.
(TABLE START)
        5.6.1 Type of Ringing.
@h1
@h1
@h1
@h1
@h1
5.6.2 Frequency No.  .... 1.  .... 2.  .... 3.  .... 4.
Frequency HZ  ....   ....   ....   ....
Max. No. Phones/Frequency  ....   ....   ....   ....
(TABLE END)
        5.6.3 Wattage to be sized for XXXX lines.
        5.6.4 Frequency Meter (see Item 12.3.3, Appendix A). Panel Mounted XXX Not Required XXX.
6. Emergency Operation
        6.1 If path to central office is opened, the RST shall be able to complete calls between subscribers in its own system: Yes XXX No XXX
        Further requirements should be listed under Item 12, Appendix B.
7. RST Distribution Frame Requirements
        7.1 Total number of outside plant cable pairs to be terminated XXX.
        7.1.1 Gauge of outside plant cable pairs XXXX.
        7.2 Number of outside plant cable pairs to be protected XXXX.
        7.3 Number of additional protector pair units to be provided on MDF XXXX.
        Explain:
        7.4 Main Frame Details
        7.4.1 Present MDF to be reused  YesXXX NoXXX.
        If ``Yes'', Type XXXX.
        Reused protectors are: XXXX (Mfr.) XXXX (Type).
        7.4.2  Number of pairs of arrester units (switching equipment) XXXX.
        7.4.3 Number of pairs of gas tube arrester units (special equipment) XXXX.
        7.4.3.1 Gas tubes to be: XXX light, XXX medium, XXX heavy, XXX maximum duty units.
        7.4.3.2 Fail shorted/low breakdown failure mode required Yes XXX No XXX.
        7.4.3.3 Breakdown voltage of gas tube arresters XXXX.
        7.4.4 Number of terminated pairs to be grounded XXXX.
        7.4.5 Factory assembled tip cable  Yes XXX No XXX.
        7.4.5.1 Tip cable length [if other than 20 feet (610 cm)] XXX.
        7.4.5.2 Tip cable formed Up XXX Down XXX.
        7.4.6 Pairs per vertical XXXX.
        7.4.7 Height of vertical XXXX feet XXXX inches.
8. Building and Floor Plan Information
        8.1 RST to be mounted in building XXX.
        8.1.1 Earthquake bracing required Yes XXXNo XXX(see Item 14.3.6, Appendix A).
        8.1.2 Supply building floor plan.
        8.2 RST to be mounted in cabinet out of doors XXX.
        8.2.1 Cabinet to be mounted XXXon pole XXXon ground.
9. Subscriber Line Test
        9.1 Remote testing of subscriber lines is required Yes XXXNo XXX.
        9.2 Subscriber loop test set XXX.
10. Span Lines to Host Central Office
        10.1 To be supplied by Owner XXX.
        10.2 To be supplied by Bidder XXX.
        10.2.1 When the bidder is to supply the span lines, an RUS Form 397b, Trunk Carrier Systems, with the applicable parts completed must be attached with a physical layout of the span line.
11. Grounding Considerations
        11.1 The RST ground will be XXXohms or less. (Refer to Item 4.6.3 of RUS TE&CM 810.)
        11.2 This RST is considered to be in the following category for lightning damage probability based on the Figure 1 map of RUS TE&CM 823.XXXXVery High XXXX Higher than Average XXXXAverage XXXX Lower than Average XXXXVery Low
        11.3 The following is additional information regarding operating environment conditions which should be considered in determining system protection requirements (tower in vicinity, high exposure, etc.):
12. Explanatory Notes
Appendix C to 7 CFR 1755.522 -- Specifications for Digital, Stored Program Controlled Central Office Equipment Detailed Requirements -- Bidder Supplied Information
Telephone Company
Name
Location
_
_
Central Office Name (By Location)
Town XXXXX
County XXXXXState XXX
_
        Attended XXX UnattendedXXX
1. General
        1.1 The equipment and materials furnished by the bidder must meet the requirements of paragraphs (a) through (x), Appendix A, and Appendix B of _1755.522.
        1.2 Paragraphs (a) through (x) of _1755.522 cover the minimum general requirements for digital, stored program controlled central office switching equipment.
        1.3 Paragraph (y) of _1755.522 covers requirements for installation, inspection, and testing when such service is included as part of the contract.
        1.4 Appendices A and B of _1755.522 cover the technical data for application engineering and detailed equipment requirements insofar as they can be established by the owner. These appendices are to be filled in by the owner.
        1.5 Appendix C of _1755.522 covers detailed information on the switching network equipment and the stored program controlled equipment, and information as to system reliability and heavy traffic delays as proposed by the bidder. This appendix is to be filled in by the bidder and must be presented with the bid.
        1.6 Appendix D of _1755.522 is the single-point grounding system audit checklist.
2. Performance Objectives
        2.1 Reliability (see paragraph (b) of _1755.522).
_
_
_
_
        2.2 Busy Hour Load Capacity and Traffic Delay (see paragraph (e)(10) of _1755.522. Describe basis for traffic analysis).
_
_
_
_
3. Equipment Quantities Dependent on System Design
        3.1 Switch Frames and Circuits.
        3.1.1 Number of Lines.
        3.1.1.1 The number of lines to be provided shall include the number required for the termination of subscriber lines, Item 7, Appendix A, plus the number required for routine testing plus any additional to meet the minimum switch increment of the selected system.
        3.1.1.2 The number of lines provided for this office will be XXX
        3.1.2 Number of Ports Used for Trunks
        3.1.2.1 The number of trunk ports to be provided shall be based on the trunk quantities required (Item 8, Appendix A) as modified by the minimum increment of the selected system. Provision shall be made for at least 5 percent additional inlet and outlet ports over those required initially. The additional ports shall be used for connecting additional trunks that may be required in the future.
        3.1.2.2 The number of trunk ports provided for this office will be XXXXXX
        3.1.3 Number of Subscriber Directory Numbers
3.1.3.1 The number of directory numbers provided shall be based on the total directory numbers required (Item 6.1.11, appendix A), as modified by the memory increment of the proposed system.
        3.1.3.2 The number of subscriber directory numbers provided for this office will be XXXXXX
4. RST
        4.1 Information for RST's must be supplied for each RST to be furnished.
        4.2 Number of line terminals for this RST will be XXXXXX .
        4.3 Number of span line terminations to the central office being supplied XXXXXX .
        4.4 If the emergency operation option is required, it will provide the following service when connection to the main office is severed:
_
_
_
        4.5 The ac power drain at the remote end will be:
Initial XXXXXX Ultimate XXXXXX Voltage: Single-Phase XXXXXX Three-Phase XXXXXX
        4.6 Special environmental requirements for the remote end:
_
_
_
5. Power
        5.1 AC Power Drain Watts
Initial XXXXXX  Ultimate XXXXXX
        5.2 Heat Dissipation Watts
Provide the initial and ultimate equipment dissipation for each equipment room.
        5.2.1 Operating Temperature Range
Minimum XXXXXX Maximum XXXXXX
        5.2.2 Operating Humidity Range
Minimum XXXXXX Maximum XXXXXX
6. Additional Information to be Furnished by Bidder
        6.1 The bidder shall accompany its bid with the following information:
        a. Two copies of the equipment list and the calculations from which the quantities in the equipment list are determined;
        b. Two copies of the traffic tables from which the quantities are determined, other than the full availability tables shown in paragraph (p)(1)(i) of _1755.522;
        c. Two copies of detailed switching diagram showing the traffic on each route, the grade of service, the quantity of circuits, and main distributing frames;
        d. Block diagram of stored program control and associated maintenance equipment;
        e. A prescribed method and criteria for acceptance of the completed central office, which is subject to review;
        f. Location of technical assistance service with 24-hour maintenance, and conditions when owner will be charged for access to the service;
        g. Calculations showing the method by which ringing machine sizes were derived;
        h. Precautions to be taken against static discharge;
        i. Details of central office grounding requirements, recognizing local grounding conditions;
        j. Details concerning traffic measurement capabilities and formats; and
        k. Details concerning AMA features and formats to be provided.
        6.2 As a part of the response to the bid, the bidder must also list information concerning the types and quantities of spare parts to be furnished. All units, excluding those units described in paragraph (x)(6)(i)(C) of _1755.522, must fall into one of the four classes. The
(TABLE START)information must be in the following format:
@h1Unit No.
@h1Unit name
@h1Quantity of units in the CO's and RST's which are bid @h2Class 1@h2Class 2@h2Class 3@h2Class 4
@h1Quantity of spare parts furnished with this bid@h2Class 1@h2Class 2@h2Class 3@h2Class 4
(TABLE END)
7. Explanatory Notes
Appendix D to 7 CFR 1755.522 -- Acceptance Checklist -- Single-point Grounding System
1. Approval Statement
Telephone Company:
RUS Borrower Designation:
RUS Contract Number:
N/A
Name:
Central Office:
Remote:
Date of Inspection:
Names of Inspectors:
Owner Representative
Central Office Supplies
Consulting Engineer
Mutually Approved Exceptions:
_
_
_
_
Grounding System Approval:
Name (Owner Representative)
Signature
Title
Date
Name (Supplier Representative)
Signature
Title
Date
2. General Survey
        2.1 This office is considered to be in the following category for probability of lightning damage based on the Figure 1 map in RUS TE&CM 823 (also refer to paragraph (u)(2) of _1755.522)
XXVery High XXHigher than Average XX Average XXLower than Average XXVery low
        2.2 Central office ground field (COGF) to be inspected for proper bonding of conductors to ground rods, etc. COGF to earth grounding reading is XXXXohms. (Refer to RUS TE&CM 802, Appendices C and D, Measurement Techniques.) Is this resistance reading acceptable? (Refer to RUS TE&CM 810, Items 1.6, 4.6.2 and 4.6.3 for protection considerations.)
Acceptable: XXYes XXNo
Comments:
_
_
        2.3 Ground connection to be inspected from the master ground bar (MGB) to the central office ground field (COGF) to ensure it is properly sized and installed by most direct route with no sharp bends. (Refer to RUS TE&CM 810, Item 4.3.2 and section 8.1.)
Acceptable: XXYes XXNo
Comments:
_
_
        2.4 Building structure grounds (steel rebar in footings, ironwork, etc.) are to be properly bonded and connected to the MGB. (Refer to RUS TE&CM 810, Item 4.3.4.)
Acceptable: XXYes XXNo
Comments:
_
_
        2.5 Metallic central office door(s) are to be painted with metallic paint with doorknobs left bare. Door(s) and frames are to be grounded to the building structural ground or the MGB.
Acceptable: XXYes XXNo
Comments:
_
_
        2.6 Metallic fences within 6 feet (183 cm) of the exchange building, storage facilities ground field, etc. are to be properly bonded to the COGF outside of the central office building. Handhole enclosure is to be used for the COGF connection to permit inspection and disconnect for earth resistance testing. (Refer to RUS TE&CM 810, Appendix C, Item 4.6.1.)
Acceptable: XXYes XXNo
Comments:
_
_
        2.7 Lightning rod systems are to be grounded by a separate dedicated ground field. A bond should be provided between the COGF and the lightning rod ground field. Handhole enclosure is to be used for the COGF connection to permit inspection and disconnect for earth resistance testing. (Refer to RUS TE&CM 810, Item 4.3.2.1.)
Acceptable: XXYes XXNo
Comments:
_
_
        2.8 Radio/microwave tower ground grid is to be properly bonded to the COGF by a direct outside connection. Handhole enclosure is to be used for the COGF connection to permit inspection and disconnect for earth resistance testing. (Refer to RUS TE&CM 810, Item 4.3.2 and section 10.)
Acceptable: XX Yes XX No
Comments:
_
_
        2.9 If a qualified metallic water system is present, inspect the MGB connecting conductor to ensure that it is properly sized and installed by the most direct route with no sharp bends and that it is clamped solidly on the water pipes. (Refer to RUS TE&CM 810, Item 4.3.3 for details on metallic water system grounding.)
Acceptable: XX Yes XX No
Comments:
_
_
        2.10 All power and grounding conductors are to be continuous, end to end, with no splices, size discontinuity or intermediate terminations. If an exception is necessary, unusual care must be taken to assure proper bonding between the two sections. (Refer to RUS TE&CM 810, Appendix C, section 5.)
Acceptable: XX Yes XX No
Comments:
_
_
        2.11 All ground conductors should be void of sharp bends along their entire lengths. (Refer to RUS TE&CM 810, Item 8.2.2.)
Acceptable: XX Yes XX No
Comments:
_
_
        2.12 Ground conductors should only be placed in nonmetallic conduit. Those routed through metallic conduit require that both ends of the conduit be bonded to the ground conductor. (Refer to RUS TE&CM 810, Item 8.2.4.)
Acceptable: XX Yes XX No
Comments:
_
_
        2.13 Ground conductors should not be encircled by metallic clamp. Metallic straps are to be removed and replaced with nonmetallic clamps. (Refer to RUS TE&CM 810, Item 8.2.4.)
Acceptable: XX Yes XX No
Comments:
_
_
        2.14 If metallic conduit is used, it is to be insulated from all ironwork.
Acceptable: XX Yes XX No
Comments:
_
_
        2.15 Inspect to determine if the required central office supplier electrostatic discharge plates, wrist wraps, antistatic floor mats, etc. are available and properly installed. (Refer to RUS TE&CM 810, Item 12.3.)
Acceptable: XX Yes XX No
Comments:
_
_
        2.16 Ground conductors, except green wires, should not be routed close and parallel to other conductors so as to minimize induction on surges into equipment wiring. It is also better not to route these ground conductors through cable racks or troughs, or within the confines of any iron work. (Refer to RUS TE&CM 810, Item 8.2.3.)
Acceptable: XX Yes XX No
Comments:
_
_
3. Master Ground Bar (MGB)
        3.1 The designated P, A, N, and I segments of the master ground bar (MGB) should be clearly identified. (Refer to RUS TE&CM 810, Figure 1 for MGB segmentation arrangement.)
Acceptable: XXYes XXNo
Comments:
_
_
        3.2 Check for appearance and proper location of following on MGB:
        (a) R -- Interior radio equipment\1\ (FOOTNOTE)
 (FOOTNOTE) \1\Surge Producer -- (P)
        (b) C -- Cable entrance ground bar\1\
        (c) M -- MDF ground bar\1\
        (d) G -- Standby power equipment frame ground\1\
        (e) N -- Commercial power MGN\2\ (FOOTNOTE)
 (FOOTNOTE) \2\Surge Absorber -- (A)
        (f) B -- Building structure ground\2\
        (g) L -- Central office ground field\2\
        (h) W -- Water pipe system\2\
        (i) N\1\ -- Battery Return\3\ (FOOTNOTE)
 (FOOTNOTE) \3\Grounds to non-IGZ Equipment -- (N)
        (j) N\2\ -- Outside IGZ: XXXXXX\3\
        (k) N\3\ -- Outside IGZ: XXXXXX\3\
        (l) I\1\ -- Ground window bar\4\ (FOOTNOTE)
 (FOOTNOTE) \4\Grounds to IGZ Equipment (GWB's) -- (I)
        (m) I\2\ -- Ground window bar\4\
Acceptable: XXYes XXNo
Comments:
_
_
        3.3 All connections to MGB are to be two-hole bolted down copper crimped or compression type terminal lugs. (NOTE: No solder connections are permitted.)
Acceptable: XXYes XXNo
Comments:
_
_
        3.4 MGB is to be properly insulated from the mounting surface.
Acceptable: XXYes XXNo
Comments:
_
_
        3.5 All connections are to be tight.
Acceptable: XXYes XXNo
Comments:
_
_
        3.6 The MGB is to have an anticorrosion coating of the type which enhances conductivity.
Acceptable: XXYes XXNo
Comments:
_
_
        3.7 Bar is to be clearly stenciled or legibly labeled ``MGB.''
Acceptable: XXYes XXNo
Comments:
_1
_
        3.8 All ground leads are to be properly sized and labeled as to point of origin. (Refer to RUS TE&CM 810, Item 8.3.1 and section 8.1.)
        Acceptable: XXYes  XXNo
Comments:
_
_
4. Ground Window Bar (GWB)
        4.1 All equipment grounds that originate inside of an Isolated Ground Zone (IGZ) are to be terminated on the GWB which is preferably located physically inside the IGZ and insulated from its support. (Refer to RUS TE&CM 810, Item 5.1.)
        Acceptable: XXYes  XXNo
Comments:
_
_
        4.2 Each GWB is to be connected to the MGB by the most direct route with a conductor of 2/0-gauge or coarser, or resistance of less than 0.005 ohms. Parallel conductors for redundancy if required by the supplier. (Refer to RUS TE&CM 810, Item 8.1.2.)
        Acceptable: XXYes  XXNo
Comments:
_
_
        4.3 The metal framework grounds of only that switching equipment and associated electrical equipment located inside of the IGZ should be connected to the GWB as required by the central office equipment supplier. (Refer to RUS TE&CM 810, Item 5.5.)
        Acceptable: XXYes  XXNo
Comments:
_
_
        4.4 GWB is to be clearly stenciled or labeled ``GWB.''
        Acceptable: XXYes  XXNo
Comments:
_
_
        4.5 All connections are to be tight.
        Acceptable: XXYes  XXNo
Comments:
_
_
5. Isolated Ground Zone (IGZ)
        5.1 IGZ areas are to be clearly marked on the floor or in some other easily recognizable manner. (Refer to RUS TE&CM 810, Item 6.1.1)
        Acceptable: XXYes  XXNo
Comments:
_
_
        5.2 Confirm that all framework, cabinets, etc., within the IGZ are ground connected only to the GWB. (Refer to RUS TE&CM 810, Item 5.5.)
        Acceptable: XXYes  XXNo
Comments:
_
_
        5.3 All cable racks, ground mats, switching and transmission equipment within the IGZ are to have ground leads only to the GWB. (Refer to RUS TE&CM 810, Item 5.5.2.)
        Acceptable: XXYes  XXNo
Comments:
_
_
        5.4 Review ac power feed arrangement within the IGZ for acceptable receptacle type and confirm that all green wires are properly connected. (Refer to RUS TE&CM 810, Item 5.5.4.)
        Acceptable: XXYes  XXNo
Comments:
_
_
        5.5 All ironwork, metallic conduit, and other equipment associated with the switch are to be properly insulated at the IGZ boundary as stipulated by the supplier. (Refer to RUS TE&CM 810, Item 6.2.)
        Acceptable: XXYes  XXNo
Comments:
_
_
        5.6 With the GWB disconnected from the MGB, the resistance reading of XXX ohms between the GWB and the MGB indicates adequate isolation. (CAUTION: Test is to be conducted only with the approval and under the direction of the central office supplier.)
        Acceptable: XXYes  XXNo
Comments
_
_
6. Entrance and Tip Cables
        6.1 When neither a cable vault nor a splicing trough exists, the outside plant cable should be brought into the central office and spliced to tip cables with a PVC outer jacket (ALVYNR) or equivalent as close as practical to the cable entrance. (Refer to RUS TE&CM 810, Item 7.3.4.)
        Acceptable: XXYes  XXNo
Comments:
_
_
        6.2 All outside entrance cables and all tip cable shields are to be separated by at least a 3-inch (7.6 cm) gap between shield ends.
        Acceptable: XXYes  XXNo
Comments:
_
_
        6.3 All entrance cable shields are to be bonded separately to 1B6 AWG or larger insulated wire or bonding ribbon and connected to the Cable Entrance Ground Bar (CEGB) by most direct route with minimum bends.
        Acceptable: XXYes  XXNo
Comments:
_
_
        6.4 Outside plant cable shields are to be connected only to the CEGB, and the tip cable shields are to be connected only to the Main Distributing Frame Bar (MDFB).
        Acceptable: XXYes  XXNo
Comments:
_
_
7. Cable Entrance Ground Bar (CEGB)
        7.1 The CEGB is to be properly insulated from the mounting surface. (Refer to TE&CM 810, Item 4.2.1.)
        Acceptable: XXYes  XXNo
Comments:
_
_
        7.2 The CEGB is to be located as close as possible to the physical ends of the entrance cable shields.
        Acceptable: XXYes  XXNo
Comments:
_
_
        7.3 All connections are to use two-hole bolted down copper crimped or compression type terminal lugs. (NOTE: No solder connections are permitted.)
        Acceptable: XXYes  XXNo
Comments:
_
_
        7.4 All connections are to be tight.
        Acceptable: XXYes  XXNo
Comments:
_
_
        7.5 Bar is to be clearly stenciled or legibly labeled ``CEGB.''
        Acceptable: XXYes  XXNo
Comments:
_
_
        7.6 All ground leads are to be properly sized and labeled.
        Acceptable: XXYes  XXNo
Comments:
_
_
        7.7 The CEGB is to have an anticorrosion coating of the type which enhances conductivity.
        Acceptable: XXYes  XXNo
Comments:
_
_
        7.8 The CEGB is to be connected to the MGB by a properly sized conductor and by the most direct route. (Refer to RUS TE&CM 810, section 8.1.)
        Acceptable: XXYes  XXNo
Comments:
_
_
8. Main Distributing Frame (MDF)
        8.1 RUS strongly recommends that MDF protectors be furnished without heat coils. (Refer to RUS TE&CM 810, section 7.6.)
        Acceptable: XXYes  XXNo
Comments:
_
_
        8.2 Incoming cable pairs terminated on MDF protector assemblies should be protected with protector modules. These modules should contain white coded carbon blocks or orange coded gas tube arrestors that are included in the RUS List of Materials. (Refer to RUS TE&CM 810, Item 7.4)
        Acceptable: XXYes  XXNo
Comments:
_
_7
        8.3 All incoming subscriber cable pairs are to be properly terminated at either a protector equipped terminal or connected to ground.
        Acceptable: XXYes  XXNo
Comments
_
_
        8.4 MDF protector assemblies may be mounted directly on the vertical frame ironwork. Protector assemblies on each vertical are interconnected with each other and the Main Distributing Frame Bar (MDFB) with a 1B6 copper grounding conductor. Alternative means of connecting to the MDFB are also acceptable which do not rely on the frame ironwork for conducting surge currents to ground. (Refer to RUS TE&CM 810, section 7.)
        Acceptable: XXYes  XXNo
Comments
_
_
        8.5 Protective ``ground connections'' should be provided between the MDFB and the frame ironwork for personnel protection regardless of the type of protector assembly used. Protective ground leads should be 14-gauge, less than 12 inches (30.5 cm) in length with paint thoroughly removed at point of connection to the ironwork. (Refer to RUS TE&CM 810, Item 7.1.3.)
        Acceptable: XXYes  XXNo
Comments
_
_
        8.6 The MDFB should be insulated from the frame ironwork in all cases where it is used as a Master Ground Bar (MGB). (Refer to RUS TE&CM 810, Item 7.1.2.)
        Acceptable: XXYes  XXNo
Comments
_
_
        8.7 Where the MDFB is used as the MGB in very small offices the protective ``ground connections'' should be connected on the N section of the bar. The MDF line protector assembly grounds should be connected to the P section of the bar. (Refer to RUS TE&CM 810, Item 7.1.4.)
        Acceptable: XXYes  XXNo
Comments
_
_
        8.8 The MDFB is to be connected to the MGB by the most direct path with minimum bends and proper conductor size. (Refer to RUS TE&CM 810, Item 8.1.4.)
        Acceptable: XXYes  XXNo
Comments
_
_
        8.9 The MDFB should be free of all other ground leads when not used as an MGB.
        Acceptable: XXYes  XXNo
Comments
_
_
        8.10 Alternative arrangements which insulate the line protector assemblies and MDFB from the frame ironwork may require a direct ground connection of the frame ironwork to the MGB for personnel protection. Conductor is properly sized and tightened with paint removal on main frame ironwork at point of connection.
        Acceptable: XXYes  XXNo
Comments
_
_
9. Power Service Protection and Grounding
        9.1 The ground conductor between the ac power system multigrounded neutral (MGN) at the main ac disconnect panel and the master ground bar (MGB) is to be properly sized and connected. (Refer to RUS TE&CM 810, Items 2.19, 4.3.1 and 8.1.3.)
 Acceptable: XXYes XXNo
Comments:
_
_
        9.2 If there is a non-MGN ac power system, there is to be a properly sized and connected insulated conductor bond between the power service ground electrode and the MGB. (Refer to RUS TE&CM 810, Item 4.3.1.1.)
Acceptable: XXYes XXNo
Comments:
_
_
        9.3 AC conductors including ground conductors serving 120-volt ac electric convenience receptacles and all direct wire peripheral equipment, located in the IGZ, should be sized in accordance with normal ``green wire'' criteria. (Refer to RUS TE&CM 810, Items 5.5.4, 5.5.5, and 5.5.6.)
Acceptable: XXYes XXNo
Comments:
_
_
        9.4 Minimum protection for ac power serving the central office buildings should consist of an RUS accepted secondary arrestor at the service entrance. (Refer to RUS TE&CM 810, section 9.)
Acceptable: XXYes XXNo
Comments:
_
_
        9.5 A properly sized conductor for ground bonding between the standby power plant framework (not separately derived) and the MGB is to be provided to equalize framework voltages for personnel safety reasons. (Refer to RUS TE&CM 810, Item 4.2.4.)
Acceptable: XXYes XXNo
Comments:
_
_
10. Miscellaneous
        10.1 All non-IGZ equipment frames, relay racks, cable racks and other ironwork are to be properly connected to the MGB. (Refer to TE&CM 810, Item 4.4.)
Acceptable: XXYes XXNo
Comments:
_
_
        10.2 Shields on high frequency intra-office cables are to be properly isolated and connected only to an isolation ground bar in the relay rack. All shielded cables entering the IGZ should only be referenced at the IGZ termination point as given by the manufacturer. (Refer to RUS TE&CM 810, Item 7.2.1.2.)
Acceptable: XXYes XXNo
Comments:
_
_
        10.3 Isolation ground bars in the relay racks are to be properly connected to the MGB with appropriate sized conductor with no sharp bends.
Acceptable: XXYes XXNo
Comments:
_
_
        10.4 All radio equipment cabinet(s) are to be at least 10 feet (305 cm) from the IGZ.
Acceptable: XXYes XXNo
Comments:
_
_
        10.5 The metal spare parts cabinet is to be grounded with a #6 AWG or larger insulated wire to non-IGZ cable rack, etc. or directly to the MGB.
Acceptable: XXYes XXNo
Comments:
_
_
[58 FR 30938, May 28, 1993; 58 FR 36252, July 6, 1993; as amended at 60 FR 1711, Jan. 5, 1995; 60 FR 64312, 64314, Dec. 15, 1995]
_1755.522, Note
        Effective Date Note: At 60 FR 64312 and 64314, Dec. 15, 1995, _1755.522 was amended by revising paragraphs (e)(5), (e)(6), (e)(7), (e)(11), and (e)(19)(vii), removing paragraph (f)(1)(ii), redesignating paragraph (f)(1)(iii) as paragraph (f)(1)(ii), removing paragraphs (g)(2)(ii), (g)(2)(iii) and (g)(8), redesignating paragraphs (g)(2)(iv) through (g)(2)(xv) as paragraphs (g)(2)(ii) through (g)(2)(xiii), and paragraphs (g)(9) through (g)(12) as paragraphs (g)(8) through (g)(11), revising paragraph (i)(2)(ix) and the text preceeding the table in paragraph (p)(1)(vi), amending paragraph (p)(3)(i) by removing the entry ``Revertive'' from the table, removing paragraph (r)(6), redesignating paragraphs (r)(7) and (r)(8) as paragraphs (r)(6) and (r)(7), and revising paragraph (s)(5)(ii)(A), the text preceeding the table in paragraph (s)(5)(ii)(C), and paragraph (s)(6)(ii), and by revising items 6., 7., and 10. in Appendix A, removing items 1.2 and 1.3 and redesignating items 1.4 through 1.9 as items 1.2 through 1.7 in Appendix B, and revising item 3.1.3.1 in Appendix C, effective January 16, 1996.  For the convenience of the reader, the superseded text is set forth below.
_1755.522 RUS general specification for digital, stored program controlled central office equipment.
* * * * *
        (e) * * *
        (5) The basic switching system shall include the provision of software programming and necessary hardware, including memory, for optional custom calling services such as call waiting, call forwarding, three-way calling, and abbreviated dialing. It shall be possible to provide these services to any individual line (single-party) subscriber, and consideration should be given to supplying at least some of these services to two-party lines, when specified by the owner (except during revertive call), where each party is identifiable to the equipment for this purpose. The addition of these services shall not reduce the anticipated ultimate engineered line, trunk, and traffic capacity of the switching system as specified in appendix A of this section.
        (6) The number of parties per line is intended to be no more than four. The type of ringing shall be as specified in appendix A of this section.
        (7) Provision shall be made for local automatic message accounting (LAMA), and for traffic service position system (TSPS) trunks, or equivalent, to the operator's office when required either initially or in the future. Operator identification will be satisfactory for lines with more than two parties unless otherwise specified in Item 16 of appendix A of this section.
* * * * *
(11) Provision shall be made for hotel-motel arrangements, as required by the owner, to permit the operation of message registers at the subscriber's premises to record local outdial calls by guests (see Item 10.6, appendix A of this section).
* * * * *
        (19) * * *
(vii) If the 911 service bureau is holding a calling line, it shall be possible for the 911 line to cause the equipment to ring back the calling line. This is done by providing a flash of on-hook signal from the 911 line lasting from 200 to 1,100 milliseconds. The signal to the calling line shall be ringing current if the line is on-hook, or receiver off-hook (ROH) tone if the line is off-hook. Ringback tone shall be provided to all parties of a multiparty line if multiparty automatic number identification (ANI) is not available.
* * * * *
        (i) * * *
        (2) * * *
(ix) Distinctive tone, when required for revertive calls, alarm calls, or other features, shall consist of high tone interrupted at 200 IPM with tone on 150 ms and off 150 ms.
* * * * *
        (p) * * *
        (1) * * *
(vi) The traffic capacity in the following table should be used for small trunk groups such as pay station, special service trunks, revertive circuits, intercept and PBX trunks, unless otherwise specified in appendix A of this section.
* * * * *
        (s) * * *
        (5) * * *
        (ii) * * *
        (A) The ringing generators shall have an output voltage which approximates a sine wave and shall be suitable for ringing decimonic, synchromonic, harmonic or straight-line ringers, as specified in appendix A of this section.
* * * * *
(C) The output of each generator shall have three or more voltage taps or a single tap with associated variable control. Taps or control shall be easily accessible as installed in the field. Software control of ringing generator outputs via I/O devices may be provided in lieu of taps. The taps, or equivalent, shall be designated L, M, and H. The variable control shall have a locking device to prevent accidental readjustment. The outputs at the terminals of the generators with a voltage input of 52.1 volts and rated full resistive load shall be as follows.
* * * * *
        (6) * * *
(ii) The ringing cycle provided by the interrupter equipment shall not exceed 6 seconds in length. The ringing period should be 2 seconds, except in cases where offices with four-party multifrequency ringing cannot be arranged to provide a 2-second ring. In such cases, arrangements for providing four ringing periods of 1.25 - 1.40 seconds each in a 6-second ringing cycle will be satisfactory.
* * * * *
Appendix A to 7 CFR 1755.522 -- Specification for Digital, Stored Program Controlled Central Office Equipment Detailed Requirements (Host)
* * * * *
6. Line Circuit Requirements
        (Includes all lines associated with RST's.)
(TABLE START)
6.1 Types of Lines
@h1
@h1No. of Lines@h2Local service only@h2Both local & EAS service
@h1No. of EAS areas
@h1Total No. of lines required
6.1.1  Individual -- Flat Rate ....  ....  ....  ....
6.1.2  Individual -- Message Rate ....  ....  ....  ....
6.1.3  Two-Party -- Flat Rate ....  ....  ....  ....
6.1.4  Two-Party -- Message Rate ....  ....  ....  ....
6.1.5  Four-Party ....  ....  ....  ....
6.1.6  Pay Station ....  ....  ....  ....
6.1.7  Telephone Company Official Lines ....  ....  ....  ....
6.1.8  Wire Chief ....  ....  ....  ....
6.1.9  911 Emergency Service Bureau Lines ....  ....  ....  ....
(TABLE START)
6.1.10 Number Hunting PBX Groups ....  ....  ....  ....
(TABLE END)
@h1Number of lines in group
@h1No. of groups
@h1Direct in dial*
@h1Restricted service at COE
@h1Type@h2Ground Start@h2start
@h1
@h1
@h1
@h1
 @rs_
 @rs_
 @rs_
 @rs_
 @rs_
Footnote: *Furnish translation information under item 5.
(TABLE END)
        6.1.11 WATS Lines (Give details in Appendix A, Item 16).
         Number of Inward WATS Lines XXX.
        Number of Outward WATS Lines XXX.
        6.1.12 Special Lines Required XXX (Explain in Appendix A, Item 16).
        6.1.13 Total Number of Lines Required.
        Host XXX (Incl. DDI Concentrator Lines).
        RST 1 XXX.
        RST 2 XXX.
        RST 3 XXX.
        TOTAL XXX.
        6.1.14 Total Directory Numbers Required XXX. (Including RST's) (see Item 7.1, Appendix A).
        6.1.15 Pay Station.
        Type XXX.
        New XX.
        Reused XX.
        (Describe in Item 16, Appendix A).
        6.1.16 Line Concentrator.
        6.1.16.1 Supplied by Owner (see Item 16, Appendix A, for details).
        Yes XX.
        No XX.
        6.1.16.2 Supplied by Bidder (If ``Yes'', attach RUS Form 397g, Performance Specification for Line Concentrators).
        Yes XX.
        No XX.
        6.2 Data on Lines Requiring Range Extension.
        6.2.1 Number of non-pay station lines having a loop resistance, including the telephone set, as follows:
No. of Lines
1901 - 3200 ohms XXX.
        3201 - 3600 ohms XXX.
        6.2.2 Number of pay station lines having loop resistance, excluding the telephone set, greater than:
No. of Lines
1200 ohms (For Prepay) XXXX.
1000 ohms (For Semi-Postpay Operation) XXXX.
        6.2.3 Range extension equipment is to be provided:
        6.2.3.1 Loop Extenders: Total Quantity XXXX.
By Bidder -- Quantity XXXX.
By Owner -- Quantity XXXX.
(Explain in Item 16, Appendix A).
        6.2.3.2 VF Repeaters: Total Quantity XXXX.
By Bidder -- Quantity XXXX.
(Bidder must have information on loading and cable size.)
By Owner -- Quantity XXXX (Explain in Item 16, Appendix A).
        6.2.3.3 Range extension may be furnished as an extended range line circuit at the option of the supplier. If this option is used, the quantities of loop extenders and VF repeaters will be different from the quantities listed above (see Item 6.1,a, Appendix C).
        Yes XX.
        No XX.
7. Traffic Data -- Line Originating and Terminating Traffic
        7.1 Originating Line Traffic -- Estimated per Busy Hour (Includes
(TABLE START)all lines associated with RST's)
@h1
@h1(a) CCS per main station
@h1(b) No. of main stations
@h1(axb) Total CCS
@h1No. of lines required\1\
Ind. -- Res  ....  ....  ....  ....
Two-Party -- Res  ....  ....  ....  ....
Ind. -- Bus  ....  ....  ....  ....
Two-Party Bus  ....  ....  ....  ....
Four-Party  ....  ....  ....  ....
Special Lines  ....  ....  ....  ....
Pay Station  ....  ....  ....  ....
Telco Official  ....  ....  ....  ....
Wire Chief  ....  ....  ....  ....
No. Htg. or PBX  ....  .... (2)  .... (3)
WATS  ....  ....  ....  ....
Data Service  ....  ....  ....  ....
911 Emerg. Service  ....  ....  ....  ....
Total4
  ....   .... (c) .... (d) .... (e)
Footnote: 1See Appendix A, Item 6.1.
Footnote: 2This figure is the CCS per PBX trunk.
Footnote: 3This figure is the number of PBX trunks.
Footnote: 4This is the total number of line equipments required. The number to be provided will be determined by the equipment design of the system of the selected bidder. See Appendix C, Item 3.1.1.2.
(TABLE END)
        7.2 Average Originating CCS per Line per Busy Hour
(d)/(e) =XX/XX=XX CCS/Line
        This office shall be engineered to handle an initial average originating busy hour traffic of XX CCS per line. It is anticipated that the average originating busy hour traffic will increase to XX CCS per line.
Originating Traffic Attributed to Host Only XX CCS/Line
        7.3 Terminating Traffic -- Estimated CCS per Busy Hour
        It is assumed that the total CCS for terminating traffic is the same as for originating traffic. Since digital switch networks are on a terminal per line basis, the terminating CCS per line will be the same as the originating CCS per line as shown in Item 7.2, Appendix A.
Terminating Traffic Attributed to Host Only XX CCS/Line
        7.4 Percent of Pushbutton Lines XX
        7.5 Anticipated Ultimate Capacity (20 years)
        7.5.1 Subscriber Lines
Host XX (Incl. DDI Concentrator Lines)
RST 1 XX
RST 2 XX
RST 3 XX
Total XX
* * * * *
10. Miscellaneous Operating Features
        10.1 Busy Verification
(TABLE START)
        10.1.1 By dedicated trunk from toll operator:
@h1
@h1
10.1.1.1 One-Way, Inward ....
10.1.1.2 Two-Way (Busy verification inward, intercept outward) ....
10.1.2 By prefix digit over intertoll trunk (Indicate digit(s) dialed) XXX ....
10.1.3 Access by Switchman
10.1.3.1 Dedicated Trunk  ....
10.1.3.2 Multiple of Operator Trunk ....
10.2 Revertive Calls -- Directory Number Only
10.2.1 Signal to Called Party
10.2.1.1 Recorded Announcement ....
10.2.1.2 Distinctive Tone ....
(see (i)(2)(ix) of _1755.522) ....
10.2.1.3  Other ....
(TABLE END)
Explain in Detail:
_
_
        10.3 Intercept Facilities
        10.3.1 Vacant code, disconnected number, and unassigned number
(TABLE START)intercept shall be: (Check One)
@h1
@h1
By recorded announcement:
Without cut-through to operator ....
With cut-through to operator ....
By operator ....
(TABLE END)
(TABLE START)
        10.3.2 Changed number intercept shall be: (Check One)
@h1
@h1
By recorded announcement:
Without cut-through to operator ....
With cut-through to operator ....
By operator ....
By automatic intercept system (AIS) in distant office ....
(TABLE END)
(TABLE START)
        10.3.3 Method of Reaching Operator, if required:
@h1
@h1
Separate trunk group ....
Regular interoffice toll trunks with idle trunk selecting over at least three trunks when three or more toll trunks are equipped ....
(TABLE END)
        10.3.4 Number of separate intercept trunk circuits XXX
        10.4 Line Load Control
        10.4.1 Line load control facilities are:
XX Required
XX Not Required
(Explain in Item 16, Appendix A)
        10.5 Service Observing Facilities
        10.5.1 Service observing facilities are:
XXRequired
XX Not Required
(Explain in Item 16, Appendix A)
        10.6  Hotel-Motel Arrangements
        10.6.1 Hotel-motel arrangements for operation of message registers at the subscriber's premises are:
XX Required
XX Not Required
(Explain in Item 16, Appendix A)
        10.6.1.1 How are message registers to be activated?
Line Reversal XXX
Third Wire XXX
Other XXX
(Explain in Item 16, Appendix A)
        10.7 Nailed-Up Connections
XXX Required
XXX Not Required
(Explain in Item 16, Appendix A)
(TABLE START)
        10.8 Vertical Services (RST Lines are Included)
@h1
@h1
@h1Initially
@h1Ultimate
10.8.1 Call Waiting  .... No. of Lines  ....   ....
10.8.2 Call Forwarding  .... No. of Lines  ....   ....
(TABLE END)
XX Local
XX Remote
(TABLE START)
(Explain in Item 16, Appendix A)
@h1
@h1
@h1
@h1
10.8.3 Abbreviated Dialing  .... No. of Lines  ....   ....
(TABLE END)
No. of Codes per Line XX for XX Lines
(TABLE START)
No. of Codes per Line XX for XX Lines
@h1
@h1
@h1
@h1
10.8.4  Three-Way Calling  .... No. of Lines  ....   ....
   .... CCS Per Line  ....   ....
10.8.5 Other  ....   ....   ....
(TABLE END)
(Explain in Item 16, Appendix A)
* * * * *
Appendix C to 7 CFR 1755.522 -- Specifications for Digital, Stored Program Controlled Central Office Equipment Detailed Requirements -- Bidder Supplied Information
* * * * *
        3.1.3.1 The number of directory numbers provided shall be based on the total directory numbers required (Item 6.1.14, Appendix A), as modified by the memory increment of the proposed system.
* * * * *
__1755.523 -- 1755.524 [Reserved]
_1755.525   Form 525, central office equipment contract (including installation.)
        The RUS Form 525, Central Office Equipment Contract (Including Installation), in this section shall be used for all purchases of central office equipment (other than such purchases of special equipment using Form 397) using RUS financial assistance when the equipment is supplied and installed by the seller or installed by a firm under contract with the seller as defined in 7 CFR part 1753, subparts E and H. The RUS Form 525 Central Office Equipment Contract follows:
Central Office Equipment Contract (Including Installation)
Notice and Instructions to Bidders; Central Office Equipment Project (Including Installation)
        1. Sealed Proposals for the engineering, furnishing, delivery, and installation of central office equipment, materials and software for the
_
_
(hereinafter called the ``Owner'') which is to be part of the system known as
_
_
to be financed pursuant to a loan contract between the Owner and the United States of America (hereinafter called the ``Government'') by the Administrator of the Rural Utilities Service (hereinafter called the ``Administrator'') will be received by the Owner on or before XXXXXX o'clock, XXXX.M.,
_
at
_
at which time and place the Proposals will be publicly opened and read. The Rural Telephone Bank may also be a party to the loan contract.
        2. The Bid Documents (composed of plans, specifications and drawings), together with all necessary forms and other documents for Bidders, may be obtained from the Owner or from the Engineer, at the latter's office at
_
_
        The Specifications may be examined at the office of the Owner or at the office of the Engineer. A copy of the loan contract between the Owner and the Government may be examined at the office of the Owner.
        Each set of Bid Documents will have a serial number, assigned by the Engineer, and the number of each set with the name of the Bidder will be recorded by the Engineer. Bids will be accepted only from original Bidders, or from some other qualified Bidder to whom such a set has been transferred by the original Bidder with the approval of the Engineer prior to the pre-bid technical session.
        3. A pre-bid technical session will be held with each Bidder during the week of XXXXX, 19XXX at
_
for the purpose of receiving the Bidder's Technical Proposal, discussing details of the Project(s), and considering suggestions from Bidders. The Owner shall attach to this Notice a list of the information required in the Bidder's Technical Proposal. Each Bidder will be given a specific time period for the pre-bid technical session. At the pre-bid technical session, the Bidder shall fully describe to the Owner any exceptions to the Specifications the Bidder may request. In addition, the Bidder shall identify all features and capabilities that are not fully developed or do not have a verifiable satisfactory field performance record. If the Owner decides to incorporate any changes into the Specifications, the Owner shall furnish all prospective Bidders a copy of the Specifications containing such revisions (the ``Revised Specifications'') and all Bids shall be made on the basis of the Revised Specifications. At this session, the Bidder shall identify all documentation and materials that it claims constitute agreed excluded documentation under section (2)(xi) of the Software License. The Bidder shall claim as agreed excluded documentation only those items it may be unable to provide to the Borrower as required by said section (2)(xi). The Engineer shall immediately provide a list of all items so identified to [appropriate RUS office]. The Engineer shall inform the Bidder at least XXXX days before the scheduled bid opening whether either the Engineer or [RUS] will reject the Bid because of items so identified. Licensor agrees that certain Licensed Software cannot be excluded from the requirements of said section (2)(xi), including but not limited to software that would significantly impair the operation of the System, would significantly impair the ability of the Owner to generate revenue, or would pose a risk to RUS loan security. If allowed, the agreed excluded documentation shall be individually identified in an attachment to the Bid. No bid shall be accepted from a Bidder who fails to attend the pre-bid technical session or fails to demonstrate to the Owner that its equipment meets the requirements of the Plans and Specifications.
        4. Proposals shall be submitted on the forms furnished by the Owner and must be delivered in a sealed envelope addressed to the Owner. The name and address of the Bidder, its license number, if a license is required for bidding on a project by the State, and the date and hour of the opening of bids must appear on the envelope in which the Proposal is submitted. Proposals must be in ink or typewritten. No alterations or interlineations will be permitted, unless made, initialed, and dated before submission.
        5. Prior to the submission of the Proposal, the Bidder shall make and shall be deemed to have made a careful examination of the Specifications, forms of Bidder's Proposal and Acceptance, and Contractor's Bond attached hereto, and shall become informed as to the location and characteristics of the proposed central office and remote terminal installations, features and services, the transportation facilities, the kind of facilities required before and during the delivery and installation of the equipment and materials, the general local conditions and all other matters that may affect the cost and the time of completion of the installations. Bidders will be required to comply with all applicable statutes, codes, and regulations, including those pertaining to the licensing of contractors and the ``Anti Kick-Back Acts,'' as amended, (40 U.S.C. 276c; 41 U.S.C. 51 et seq.) and regulations issued pursuant thereto, and 18 U.S.C. 287, 874, 1001, as amended.
        6. Each Proposal must be accompanied by a Bid Bond, in the form attached, or a certified check on a bank that is a member of the Federal Deposit Insurance Corporation, payable to the order of the Owner, in an amount equal to ten percent (10%) of the maximum possible bid price. The maximum possible bid price is the sum of the total base bid, spare parts, maintenance tools and all positive amounts for alternates. Each Bidder agrees that, if its Proposal is one of the three low Proposals, its Bid Bond or check shall be held by the Owner until a Proposal is accepted and Contractor's Bond, when required, is furnished by the successful Bidder and such acceptance has been approved by the Administrator, or for a period not to exceed ninety (90) days from the date hereinbefore set for the opening of Proposals whichever period shall be the shorter. If such Proposal is not one of the three low Proposals, the Bid Bond or check will be returned to the Bidder within a period of thirty (30) days.
        7. The successful Bidder will be required to furnish to the Owner a Contractor's Bond in conformance with the requirements of 7 CFR part 1788, subpart C, Insurance for Contractors, Engineers, and Architects.
        8. Should the successful Bidder fail or refuse to furnish a Contractor's Bond within thirty (30) days after written notification of the award of the Contract by the Owner, the Bidder will be considered to have abandoned the Proposal. In such event, the Owner shall be entitled (a) to enforce the Bid Bond in accordance with its terms, or (b) if a certified check has been delivered with the Proposal, to retain from the proceeds of the certified check the difference (not exceeding the amount of the certified check) between the amount of the Proposal and such larger amount for which the Owner may in good faith contract with another party to construct the Project(s). The term ``successful Bidder'' shall be deemed to include any Bidder whose Proposal is accepted after another Bidder has previously refused or has been unable to execute the Contract or to furnish a Contractor's Bond.
        9. If requested by the Owner or the Administrator, the Bidder shall furnish evidence, satisfactory to the Owner and the Administrator, that the Bidder has the necessary facilities, ability, and financial resources to perform the Contract.
        10. The Contract, when executed, shall be deemed to include the entire agreement between the parties thereto and neither party shall claim any modification thereof resulting from any representation or promise made at any time by any officer, agent, or employee of the other or by any other person.
        11. The Owner reserves the right to waive minor irregularities or minor errors in any Proposal, if it appears to the Owner that such irregularities or errors were made through inadvertence. Any such irregularities or errors so waived must be corrected on the Proposal in which they occur prior to the execution of any Contract which may be awarded thereon. Failure to provide a Bid Bond or check as specified in item six (6) above is not a minor irregularity.
        12. The Owner reserves the right to reject any or all Proposals.
        13. The equipment to be furnished for all central offices and remote switching terminals included in the Proposal is to be of one and the same basic design. A Proposal submitted on any other basis will not be considered.
        14. Equal Opportunity and Employment
        (a) The Offeror's or Bidders's attention is called to the ``Equal Opportunity Clause'' and the ``Standard Federal Equal Employment Specifications'' set forth herein.
        (b) The goals and timetables for minority and female participation, expressed in percentage terms for the Contractor's aggregate workforce in each trade on all construction work in the covered area, are as
(TABLE START)follows:
@h1Timetables
@h1Goals for minority participation for each trade
@h1Goals for female participation in trade
  .... (Insert goals for each year) .... (Insert goals for each year)
(TABLE END)
        These goals are applicable to all the Contractor's construction work (whether or not it is federal or federally assisted) performed in the covered area. If the Contractor performs construction work in a geographical area located outside of the covered area, it shall apply the goals established for such geographical area where work is actually performed. With regard to this second area, the Contractor also is subject to the goals for both its federally involved and nonfederally involved construction.
        The Contractor's compliance with Executive Order 11246 (3 CFR, 1963 - 1965 Comp., p. 340) and the regulations in 41 CFR part 60 - 4 shall be based on its implementation of the Equal Opportunity Clause, specific affirmative action obligations required by the specifications set forth in 41 CFR 60 - 4.3(a), and its efforts to meet the goals. The hours of minority and female employment and training must be substantially uniform throughout the length of the contract, and in each trade, and the Contractor shall make a good faith effort to employ minorities and women evenly on each of its projects. Transfer of minority or female employees or trainees from Contractor to Contractor or from project to project for the sole purpose of meeting the Contractor's goals shall be a violation of the contract, Executive Order 11246 and the regulations in 41 CFR part 60 - 4. Compliance with the goals will be measured against the total work hours performed.
        (c) The Contractor shall provide written notification to the Director of the Office of Federal Contract Compliance Programs within 10 working days of award of any construction subcontract in excess of $10,000 at any tier for construction work under the contract resulting from this solicitation. The notification shall list the name, address and telephone number of the subcontractor; employer identification number of the subcontractor; estimated dollar amount of the subcontract; estimated starting and completion dates of the subcontract; and the geographical area in which the subcontract is to be performed.
        (d) As used in this Notice, and in the contract resulting from this solicitation, the ``covered area'' is
_
_
(insert description of the geographical areas where the contract is to be performed giving the state, county and city, if any).
        Note: Paragraph 14 is applicable to the extent required by law. If applicable, certain information needs to be inserted at subparagraphs (b) and (d). In determining whether and how this paragraph is applicable, reference should be made to Office of Federal Contract Compliance Programs regulations (41 CFR Chapter 60).
_
Date
_
Owner
By
Title
Bidder's Proposal to Engineer, Furnish, Deliver, and Install Equipment, Materials and Software
(Proposal shall be submitted in ink or typewritten)
To:
(Hereinafter called the ``Owner'')
        The undersigned (hereinafter called the ``Bidder'') hereby proposes to engineer, furnish, deliver, and install the equipment, materials and software for each Project listed under Column 1, ``Project,'' in Article I, section 1, and described in the plans, specifications and drawings (hereinafter called the ``Specifications'') prepared by the Owner and attached hereto and made a part hereof, financed by a loan to the Owner made or guaranteed by the United States of America, acting through the Administrator of the Rural Utilities Service (hereinafter called the ``Administrator''), or by loans to the Owner by the United States of America and by the Rural Telephone Bank, and designated XXXXXX.
        The Bidder has become informed as to the location and characteristics of the proposed installations, has become informed as to the kind of facilities required before and during the delivery and installation of the equipment, material, and software and has become acquainted with the labor conditions which would affect the work.
        The Bidder agrees that if its bid is accepted the following terms and conditions shall govern.
        If, in submitting this Proposal, the Bidder has taken any exception to the form of proposal furnished by the Owner, the Bidder understands that the Owner and the Administrator may evaluate the effect of such change as they see fit and they may exclude the Proposal from
(TABLE START)consideration in determining the award of the Contract.
Article I
[Section 1. Bid Price. The Bidder will engineer, furnish, deliver, and install the equipment, materials, and software described in the Specifications for the following sums:]
@h1Time in calendar days @h2Project (see notes 1, 2 and 3)@h2Materials, equipment, and software@h2Installation@h2Base bid@h2Delivery@h2Completion of installation@h2Completion of the project (see note 4)@h2Spare parts@h2Item@h2Maintenance tools
(1)  .... (2)  .... (3)  .... (4)  .... (5)  .... (6)  .... (7)  .... (8)  .... (9)  .... (10)@rs_
  .... $  .... $  .... $  ....   ....   ....   .... $  .... a  .... $
  .... $  .... $  .... $  ....   ....   ....   .... $  .... b  .... $
  .... $  .... $  .... $  ....   ....   ....   .... $  .... c  .... $
  .... $  .... $  .... $  ....   ....   ....   .... $  .... d  .... $
  .... $  .... $  .... $  ....   ....   ....   .... $  .... e  .... $
  .... $  .... $  .... $  ....   ....   ....   .... $  .... f  .... $
  .... $  .... $  .... $  ....   ....   ....   .... $  .... g  .... $
  .... $  .... $  .... $  ....   ....   ....   .... $  .... h  .... $
  .... $  .... $  .... $  ....   ....   ....   .... $  .... i  .... $
  .... $  .... $  .... $  ....   ....   ....   .... $  .... j  .... $ @rn,s_
Totals  .... $ .... $ .... XXXXXXXXXX .... XXXXXXXXXX .... XXXXXXXXXX .... XXXXXXXXXX .... $  .... XXX  .... $ @rn,d_
Total Base Bid  ....  ....  .... $ .... XXXXXXXXXX .... XXXXXXXXXX .... XXXXXXXXXX .... XXXXXXXXXX .... XXXXX .... XXXXXXXXXX
Alternate No. 1 .... $ .... $ .... $ ....  ....  ....  .... $ .... k .... $
Alternate No. 2 .... $ .... $ .... $ ....  ....  ....  .... $ .... l .... $
Alternate No. 3 .... $ .... $ .... $ ....  ....  ....  .... $ .... m .... $
Alternate No. 4 .... $ .... $ .... $ ....  ....  ....  .... $ .... n .... $
Alternate No. 5 .... $ .... $ .... $ ....  ....  ....  .... $ .... o .... $
Alternate No. 6 .... $ .... $ .... $ ....  ....  ....  .... $ .... p .... $
Footnote: Note 1: If a remote switching terminal, so designate and list after host office.
Footnote: Note 2: All items included in a Project shall have the same completion schedule.
Footnote: Note 3: Each Project shall be separated by a blank line.
Footnote: Note 4: Time in calendar days for Completion of the Project shall be 60 days after the time established for Completion of Installation.
(TABLE END)
        Section 2. Acceptable Equipment. Unless otherwise specified by the Owner (and agreed to in advance in writing by RUS), the Bidder agrees to furnish under this Proposal only equipment which is currently covered by a letter of acceptance issued by the Chairman, Committee ``A'' (Telephone). [Note: for convenience of borrowers and others, domestically manufactured products are included in RUS Bulletin 17551 - 100.] The Bidder agrees also to furnish only materials, equipment and software which are new and of most recent issue and manufacture, as of the date of the bid opening, or of near future release for which the Bidder can assure timely delivery.
        Section 3. Changes in Project. The Owner, with the approval of the Administrator, may from time to time during the performance of the Contract effected by the acceptance of this Proposal, make reasonable changes, additions to or subtractions from the Specifications which are part of the Proposal as conditions may warrant. However, if substantial changes in the Project shall require an extension of time, a reasonable extension will be granted if the Bidder shall make a written request therefor to the Owner within thirty (30) days after any such change is made. Further, if the cost to the Bidder shall be increased or decreased by any such change or addition, the Contract price shall be increased or decreased by a reasonable amount in accordance with a contract amendment signed by the Owner and the Bidder and approved by the Administrator. No claim for additional compensation for any such change or addition will be considered unless the Bidder shall have made a written request therefor to the Owner prior to the commencement of work in connection with such change or addition. The Delivery or Completion of Installation times specified under Columns 5, ``Delivery'', and 6, ``Completion of Installation,'' in Article I, section 1, can only be changed by a Contract amendment approved by the Bidder, the Owner and RUS.
        Section 4. Taxes. The bid prices herein set forth do not include any amounts payable by the Bidder or the Owner on account of taxes imposed by any taxing authority upon the sale, purchase or use of materials, supplies, equipment or software to be incorporated in the Project(s). If any such tax is applicable to the sale, purchase or use of materials, supplies, equipment or software hereunder, the amount thereof shall be stated separately on all invoices and paid by the Owner.
Article II
Delivery and Installation
        Section 1. Time of Completion of Installation. The time of delivery of materials, equipment, and software and of Completion of Installation are of the essence of this Contract. The Bidder shall deliver the materials, equipment, and software required hereunder for each Project upon the time intervals established under Column 5, ``Delivery,'' in Article I, section 1, after the Administrator shall have approved this Contract in writing, and shall prosecute diligently and complete the installation of materials, equipment and software for each Project in accordance with the terms of this Contract and Specifications to the satisfaction of the Owner and the Administrator within the number of calendar days specified under Column 6, ``Completion of Installation,'' in Article I, section 1. The times for such Delivery or such Completion of Installation shall be extended for the period of any reasonable delay due exclusively to causes beyond the control and without the fault of the Bidder, including, but not limited to, acts of God, fires, strikes, floods, changes in the Specifications as herein provided, and acts or omissions of the Owner with respect to matters for which the Owner is solely responsible. However, no such extension of time shall be granted the Bidder unless within thirty (30) days after Bidder becomes aware of the happening of any event relied upon by the Bidder for such an extension of time the Bidder shall have made a request therefor in writing to the Owner. Further, no delay in such time for delivery of materials, equipment and software or Completion of Installation or in the progress of the work shall result in any liability on the part of the Owner, except that the Owner shall be responsible for and shall pay the Bidder on demand all additional, supportable costs and expenses incurred by the Bidder due to delays to the extent such delays are caused by the Owner's failure to perform its obligations under this Contract unless the Owner's failure to perform is caused by forces beyond its control.
        Section 2. Sequence of Installation. All Projects shall be completed in the sequence in which they are listed under Column 1, ``Project,'' in Article I, section 1.
        Section 3. Supervision and Inspection. The Bidder shall give sufficient supervision to the work at the site of the Project(s), using the Bidder's best skill and attention. The Bidder shall carefully study and compare all drawings, specifications, and other instructions and shall promptly report to the Owner any error, inconsistency or omission which Bidder may discover. The Bidder shall keep on the Project(s) during its progress a competent superintendent (hereinafter called the ``Superintendent'') and any necessary qualified assistants, all satisfactory to the Owner. The Superintendent shall represent the Bidder and all directions given to the Superintendent by the Owner shall be as binding as if given to the Bidder. When requested by the Bidder, such directions shall be confirmed in writing.
        Section 4. Inspection and Tests. The installation of materials, equipment and software hereunder and all materials, equipment and software used therein shall be subject to the inspection, test and approval of the Owner and Administrator, in accordance with the Specifications. The Bidder shall furnish all pertinent information required concerning the nature or source of materials. The Owner and the Administrator shall have the right to inspect pertinent records (other than manufacturing cost information) of the Bidder and of any subcontractor relevant to this Project(s). The Bidder shall provide all reasonable facilities necessary for such inspection and tests, except that the Bidder is not required to provide test equipment for the Owner's tests unless specifically required in the Specifications. Failure of the Owner to make inspections shall not release the Bidder from performance required hereunder.
        The Bidder shall notify the Owner in writing upon Completion of Installation of each Project and provide a copy of the results of tests, if any, conducted by the Bidder.
        The Owner shall make inspections and tests of each Project for compliance with the Specifications and provide the Bidder the results of such inspections and tests on RUS Form 517, Results of Acceptance Tests. If the Owner has not completed its inspections and tests and provided the Bidder the results on RUS Form 517 within thirty (30) days after the written notification of Completion of Installation from the Bidder, the Owner shall (1) pay to the Bidder the costs incurred by the Bidder as a result of this delay, and (2) grant an extension of time for the Completion of the Project equal to the number of days from the date of the end of the thirty (30) day period until the date the Owner provides the RUS Form 517 to the Bidder.
        Within thirty (30) days of receipt of the RUS Form 517 from the Owner, the Bidder shall correct all deficiencies, if any, listed on the RUS Form 517 and notify the Owner in writing of such corrections and deliver to the Owner the documents set forth in Article III, section 2, at which time a final Owner's inspection and test of each Project shall be conducted. If tests subsequent to this are made necessary by the Bidder's failure to satisfactorily resolve all such deficiencies as previously listed on the RUS Form 517, the Bidder shall pay the Owner for the cost incurred by the Owner for all such subsequent tests.
        Section 5. Delivery of Possession and Control to the Owner. The Bidder shall deliver to the Owner, and the Owner shall accept, full possession and control of each Project on the date of Completion of the Project or on an earlier date if agreed under Article IV, section 2.
        Section 6. Employees. The Owner shall have the right to require the removal of any employee of the Bidder from the Project site if in the judgment of the Owner such removal is necessary in order to protect the interest of the Owner.
        Section 7. Defective Workmanship, Materials or Software. Throughout the warranty period defined below the Bidder shall, within thirty (30) days of written notice from the Owner, and without charge to the Owner, at the Bidder's option, either remedy or replace any materials, equipment or software found to be defective in material, workmanship or installation, or not in conformity with the Specification. This is subject to the following definitions and conditions:
        (a) The warranty start date for a Project is the date of delivery of possession and control by the Bidder to the Owner of that Project included in the Contract. Refer to Article II, section 5. The warranty period is twelve (12) months from the warranty start date, or six (6) months from Completion of the Project, whichever results in the longer period of coverage.
        (b) Without regard to the expiration of the warranty period set forth above, the Bidder warrants to the Owner that any Software furnished under this Contract shall function, for a period of five (5) years from the warranty start date defined in the Contract, in accordance with the specifications and any written or printed technical material provided by the Bidder to explain the operation of the Software and aid in its use. The Bidder shall correct all deficiencies within thirty (30) days from the date of receipt by the Bidder of written notice of such deficiencies from the Owner. An extension of this thirty (30) day period may be allowed only if agreed upon by the Owner. It shall be the Bidder's obligation to insert and thoroughly test, at no charge to the Owner, any software amendment or alteration provided to satisfy the obligations of this Section 7. If a deficiency is detected or a correction made within the final ninety (90) days of the warranty, the warranty shall be extended to a date ninety (90) days after the deficiency has been corrected.
        (c) The Owner shall pay the Bidder for any use of the Bidder's technical assistance center except for usage to diagnose defects covered by this warranty.
        (d) This warranty is not diminished by the acceptance of workmanship, materials, equipment, or software, or by the issuing of any certificate with respect to Completion of the Project.
        (e) This warranty does not cover defects in materials, equipment or software that are caused by modifications to or abuse of materials, equipment or software by the Owner.
        (f) The Owner shall bear the cost and risk of shipping defective components to the Bidder's designated repair center. The Bidder shall bear the cost and risk of shipping new or repaired replacement components to the Owner.
Article III
Payments and Releases of Lien
        Section 1. Payment to Bidder.
        (a) The Owner shall pay the Bidder upon the basis of written estimates of the materials, equipment, and software delivered at the site of the Project, presented by the Bidder, and approved by the Owner, the following percentages of the price of the materials, equipment, and software for each Project set forth under Column 2, ``Materials, Equipment, and Software,'' in Article I, Section 1, as and if revised:
        (i) Forty-five percent (45%) when fifty percent (50%) of the materials, equipment, and software for each Project has been delivered at the site of the Project, and
        (ii) Ninety percent (90%) when all the materials, equipment, and software required to place each Project into operation has been delivered at the site of the Project.
        (b) Upon written notification of the Completion of Installation of each Project, the Owner shall pay the Bidder ninety percent (90%) of the Base Bid plus accepted alternates for that Project.
        (c) Upon the Completion of Installation, but prior to the payment to the Bidder of any amount in excess of ninety percent (90%) of the Total Contract Price, the Owner shall inspect the work performed hereunder and if the work shall be found to be in accordance with the Specifications and all provisions hereunder, the Owner shall certify as to that fact and as to the amount of the balance found to be due to the Bidder. No later than thirty (30) days after Completion of the Contract, as defined in Article VII, section 1, ``Definitions,'' the Owner shall submit such final certificate to the Administrator for approval and when such approval has been given, the Owner shall pay to the Bidder all unpaid amounts to which the Bidder shall be entitled hereunder; provided, however, such final payments shall be made not later than sixty (60) days after Completion of the Contract unless approval by the Administrator shall be withheld or delayed due to Bidder's actions or failure to act.
        (d) Payment on undisputed invoices submitted by the Bidder shall be due thirty (30) days after receipt. Any amounts of these invoices not paid when due shall accrue interest at a rate one and one-half percent (1\1/2\%) higher than the ``Prime Rate'' published in the Wall Street Journal in its first issue of the month in which payment becomes due and changing each subsequent month with the first issue published in the respective month.
        (e) Notwithstanding other provisions of this Article III, the Bidder, shall, at its request in writing, receive payment in full for each Project upon Completion of Installation of such and upon:
        (i) Completion of the final acceptance tests of such Project as certified on RUS Form 754, Certificate of Completion, Central Office(s) and approved by the Owner.
        (ii) Submission to the Owner and Administrator of the releases of lien and Certificate of Contractor referred to in section 2 hereof or in lieu thereof, where the Bidder is the manufacturer, the execution of the Certificate of Contractor and Indemnity Agreement on RUS Form 754, all in respect of such Project.
        (iii) Approval by the Administrator of the Certificate of Completion, RUS Form 754 in respect of such Project.
        Ten percent (10%) of the contract price of one central office shall be retained until the Bidder shall have furnished the certificates and releases of lien or indemnity agreement in respect of the Project required by section 2 of this Article III.
        (This Section 1(e) is to be used only if (1) the Contract includes at least one central office and (2) the Owner wishes to allow the partial closeout procedure. The Owner shall strike out this Section 1(e) if the partial closeout procedure is not to be allowed)
        (f) Acceptance by the Owner of equipment, materials, workmanship or software while the Bidder is in default under any provision of this Contract shall not be construed as a waiver by the Owner of any right hereunder including, without limitation, any right to liquidated damages the Owner may have by virtue of Article V, section 2.
        Section 2. Release of Liens. Upon the Completion of Installation by the Bidder, but prior to the payment to the Bidder of any amount in excess of ninety percent (90%) of the Total Contract Price, except as specified in Article III, section 1(e), the Bidder shall deliver to the Owner (a) two original Waiver and Release of Lien in the form attached hereto, from manufacturers, material suppliers and subcontractors who have furnished materials or services for the work, and (b) two original Certificate of Contractor, in the form attached hereto, to the effect that all labor has been paid and that all such releases have been submitted to the Owner; and the Owner shall deliver to the Administrator for approval one of the originals of each such release and certificate.
        In lieu of releases of lien where the Bidder is the manufacturer of the equipment, the Bidder may deliver to the Owner, in duplicate in the form attached hereto, a Certificate of Contractor and Indemnity Agreement, stating that all manufacturers, material suppliers and subcontractors who have furnished materials or services for the Project(s) have been paid in full, and agreeing to indemnify the Owner against any liens arising out of the Bidder's performance hereunder which may have been or may be filed against the Owner.
        In this Article III ``manufacturer'' shall mean a Bidder who makes, produces, or manufactures the equipment and whose interest, including non-contracted installation, represent more than fifty percent (50%) of the value of the Total Contract Price.
Article IV
Particular Undertakings of the Bidder
        Section 1. Protection to Persons and Property. At all times when equipment and materials are being delivered and installed the Bidder shall exercise reasonable precautions for the safety of employees on the job and of the public and shall comply with all applicable provisions of Federal, State and Municipal safety laws and building and construction codes. All machinery and equipment and other physical hazards shall be guarded in accordance with the ``Manual of Accident Prevention in Construction'' of the Associated General Contractors of America unless such instructions are incompatible with Federal, State or Municipal laws or regulations. The following provisions shall not limit the generality of the above requirements:
        (a) The Bidder shall at all times keep the premises free from accumulations of waste material or rubbish caused by its employees or work, and at the completion of the work the Bidder shall remove all rubbish from and about the Project(s) and all its tools, scaffolding and surplus materials and shall leave its work ``broom clean.''
        (b) The work, from its commencement to completion, or to such earlier date or dates when the Owner may take possession and control, shall be under the charge and control of the Bidder and during such period of control by the Bidder all risks in connection therewith, and in connection with the equipment, materials and software to be used therein, shall be borne by the Bidder. The Bidder shall make good and fully repair all injuries and damages to the equipment, materials and software under the control of the Bidder by reasons of any act of God, or any other casualty or cause whether or not the same shall have occurred by reason of the Bidder's negligence. The Bidder shall hold the Owner harmless from any and all claims for injuries of persons or for damage to property happening by reason of any negligence on the part of the Bidder or any of the Bidder's agents, subcontractors or employees during the control by the Bidder of the Project(s) or any part thereof. The Owner shall promptly notify the Bidder in writing of any such claims received and, except where the Owner is the claimant, shall give to the Bidder full authority and opportunity to settle such claims, and reasonably cooperate with the Bidder in obtaining information relative to such claims.
        (c) Monthly reports of all accidents shall be promptly submitted to the Owner by the Bidder giving such data as may be prescribed by the Owner.
        Section 2. Termination of Bidder's Risks and Obligations. The Bidder shall deliver to the Owner, and the Owner shall accept, full possession and control of each Project on the date of Completion of the Project. However, at any time after payment by the Owner to the Bidder of ninety percent (90%) of the Total Base Bid plus accepted alternates for that Project, but prior to Completion of the Project, the Owner and the Bidder may agree in writing to an earlier date of delivery of possession and control. Upon such delivery of possession and control of any Project the Bidder's risks and obligations as set forth in Article IV, section 1(b), pertaining to such Project shall be terminated; provided, however, that nothing herein contained shall relieve the Bidder of its obligation for full performance under the Specifications, or its liability with respect to defective workmanship or materials as specified in Article II, section 7 hereof. The equipment shall not be placed in service until delivery of possession and control to the Owner has been accomplished, as set forth above.
        Section 3. Insurance. During the Bidder's performance hereunder, the Bidder shall take out and maintain fully paid insurance providing not less than the minimum coverage required by 7 CFR part 1788, subpart C.
        The Owner shall have the right to require public liability insurance and property damage liability insurance in an amount greater than those required in 7 CFR part 1788, subpart C. If this requirement is included in the plans and specifications used for bidding, the added costs shall be included in the bid price. If the requirement is added after the Contract is approved, the additional premium or premiums payable solely as the result of such additional insurance shall be added to the Contract price, by Contract amendment.
        Upon request by the Administrator, the Bidder shall furnish to the Administrator a certificate in such form as the Administrator may prescribe evidencing compliance with the foregoing requirements.
        Section 4. Purchase of Materials. The Bidder shall purchase all materials and supplies except software outright and not subject to any conditional sales agreements, bailment lease or other agreement reserving unto the seller any right, title or interest therein. Materials and supplies other than software shall become the property of the Owner as the Owner makes payments therefor to the Bidder in accordance with Article III, Section 1(a).
        Section 5. Software License. The software licensing agreement, if required, covering the rights, terms and conditions of the use and assignability of all software integral to the operation of the Project(s), shall be in the form of Addendum 1 to this Contract.
        Section 6. Assignment of Guarantees. All guarantees of materials, equipment, workmanship and software running in favor of the Bidder shall be transferred and assigned to the Owner upon Completion of the Project and at such time as the Bidder receives final payment. Any such guarantees shall be in addition to the Bidder's warranty defined in Article II, section 7. This provision may be modified with respect to a particular warranty if the Bidder demonstrates to the satisfaction of RUS and the Owner that a transfer is not possible.
        Section 7. Patent, Copyright, Trademark and Trade Secret Infringement. The Bidder shall hold harmless and indemnify the Owner from any and all claims, suits, and proceedings for the infringement of any patent, copyright, trademark or violation of trade secrets covering any equipment or software used in the work, except for items of the Owner's design or selection. If the Owner's use of equipment or software is enjoined, the Bidder shall promptly, at its own expense, modify or replace the infringing equipment or software so that it no longer infringes but remains functionally equivalent, or obtain for the Owner a license or other right to use. This shall be in addition to any other rights or claims which the Owner may have. The Bidder shall, at its own expense, (and the Owner agrees to permit Bidder to do so,) defend any suits which may be instituted by any party against the Owner for alleged infringement of patents, copyright, trademark or violation of trade secrets relative to the Bidder's performance hereunder. Either party shall notify the other promptly of any such claims, and the Owner shall give to the Bidder full authority and opportunity to settle such claims, and shall reasonably cooperate with the Bidder in obtaining information relative to such claims.
        Section 8. Compliance with Statutes and Regulations. The Bidder shall comply with all applicable laws, statutes, ordinances, rules and regulations. The Bidder acknowledges that it is familiar with the Rural Electrification Act of 1936, as amended (7 U.S.C. 901 et seq.), the Anti-Kickback Acts, as amended (40 U.S.C. 276c; 41 U.S.C. 51 et seq.), and any rules and regulations issued pursuant thereto, and 18 U.S.C. 201, 286, 287, 641, 666, 874, 1001, 1361 and 1366, as amended. The Bidder understands that the obligations of the parties hereunder are subject to the applicable regulations and orders of the Governmental agencies having jurisdiction in the premises.
        The Bidder represents that to the extent required by Executive Orders 12549 (3 CFR, 1985 - 1988 Comp., p. 189) and 12689 (3 CFR, 1989 Comp., p. 235), Debarment and Suspension, and 7 CFR part 3017, it has submitted to the Owner a duly executed certification in the form prescribed in 7 CFR part 3017.
        The Bidder represents that, to the extent required, it has complied with the requirements of Public Law 101 - 121, section 319, 103 Stat. 701, 750 - 765 (31 U.S.C. 1352), entitled ``Limitation on use of appropriated funds to influence certain Federal contracting and financial transactions,'' and any rules and regulations issued pursuant thereto.
Article V
Remedies
        Section 1. Completion on Bidder's Default. If default shall be made by the Bidder in the performance of any of the work hereunder, the Owner, without in any manner limiting its legal and equitable remedies in the circumstances, may serve upon the Bidder and the surety or sureties upon the Bidder's Bond or Bonds a written notice requiring the Bidder to cause such default to be corrected forthwith. Unless within thirty (30) days after the service of such notice upon the Bidder such default shall be corrected or arrangements for the correction thereof, satisfactory to both the Owner and the Administrator, shall have been made by the Bidder or its surety or sureties, the Owner may take over the performance of the Bidder's obligations hereunder and prosecute the same to completion by contract or otherwise for the account and at the expense of the Bidder, and the Bidder and its surety or sureties shall be liable to the Owner for any supportable cost or expense in excess of the bid price occasioned thereby. In such event, the Owner may take possession of and utilize, in completing the Project(s), any tools, supplies, equipment, appliances and plant belonging to the Bidder which may be situated at the site of the Project(s). The Owner, in such contingency, may exercise any rights, claims or demands which the Bidder may have against third persons in connection herewith and for such purpose the Bidder does hereby assign, transfer and set over unto the Owner all such rights, claims and demands.
        Section 2. Liquidated Damages. Should the Bidder fail to complete any Project as shown under Column 7, ``Completion of the Project,'' in Article I, Section 1, within the time herein agreed upon, after giving effect to extensions of time, if any, herein provided, then, in that event and in view of the difficulty of estimating with exactness damages caused by such delay, the Owner shall, so long as the subject Project shall not have been placed in service, have the right to deduct from and retain out of such moneys which may be then due, or which may become due and payable to the Bidder, the sum of: _
_
dollars ($XXXXXX)
for
(Project)
for
dollars ($XXXXXX)
for
(Project)
dollars ($XXXXXX
for
per day for each and every day that such completion is delayed beyond the scheduled time for Completion of the Project, as liquidated damages and not as a penalty, up to the amount of the respective Base Bid plus accepted alternates for the affected Project: Provided, however, that the Owner shall promptly notify the Bidder in writing of the manner in which the amount claimed as liquidated damages was computed. The Bidder shall pay to the Owner the amount necessary to effect such payment in full. Such payment is not to be reduced by the value of any partial performance by the Bidder.
        At the technical sessions, each Bidder shall identify all features and capabilities that are not fully developed or do not have a verifiable satisfactory field performance record. If the Owner allows these features to be bid as separate Projects, then they are to be individually listed under Columns 1 through 10, in Article I, section 1. These unproven features and capabilities are to be individually listed in this section 2 also, with liquidated damages amounts determined by the Owner and stated for each. If a Bidder neglects to identify any such feature at the technical session, delay in providing the feature is considered a delay in completing the associated Project and the Owner may assess liquidated damages listed for that Project regardless of whether the Project is placed in service.
        Section 3. Consequential Damages. In no event shall the Bidder's liability for incidental or consequential loss or damage, except for personal injury or tangible property damage, exceed the amount of ten times the total contract price, as amended.
        Section 4. Enforcement of Remedies by Administrator. The Administrator may on behalf of the Owner exercise any right or enforce any remedy which the Owner may exercise or enforce hereunder.
        Section 5. Cumulative Remedies. Every right or remedy herein conferred upon or reserved to the Owner or the Administrator shall be cumulative and shall be in addition to every right and remedy now or hereafter existing at law or in equity or by statute and the pursuit of any right or remedy shall not be construed as an election. Provided, however, that the provisions of section 2 of this Article V shall be the exclusive measure of damages for failure by the Bidder to have effected the Completion of Project within the time herein agreed upon.
Article VI
Equal Employment
        Section 1. The Bidder.
        (a) The Bidder represents that:
        (1) It has, XXX does not have XXX, 100 or more employees, and if it has, that
        (2) It has XXX, has not XXX, furnished the Equal Employment Opportunity Employers Information Report EEO - 1, Standard Form 100, required of employers with 100 or more employees pursuant to Executive Order 11246 and Title VII of the Civil Rights Act of 1964.
        (b) The Bidder agrees that it will obtain, prior to the award of any subcontract for more than $10,000 hereunder to a subcontractor with 100 or more employees, a statement, signed by the proposed subcontractor, that the proposed subcontractor has filed a current report on Standard Form 100.
        (c) The Bidder agrees that if it has 100 or more employees and has not submitted a report on Standard Form 100 for the current reporting year and that if this contract will amount to more than $10,000, the Bidder will file such report, as required by law, and notify the Owner in writing of such filing prior to the Owner's acceptance of this Proposal.
        (d) The Bidder certifies that it does not maintain or provide for its employees any segregated facilities at any of its establishments, and that it does not permit its employees to perform their services at any location, under its control, where segregated facilities are maintained. The Bidder certifies further that it will not maintain or provide for its employees any segregated facilities at any of its establishments, and that it will not permit its employees to perform their services at any location, under its control, where segregated facilities are maintained. The Bidder agrees that a breach of this certification is a violation of the Equal Opportunity Clause in this contract. As used in this certification, the term ``segregated facilities'' means any waiting rooms, work areas, restrooms and washrooms, restaurants and other eating areas, timeclocks, locker rooms and other storage or dressing areas, parking lots, drinking fountains, recreation or entertainment areas, transportation, and housing facilities provided for employees which are segregated by explicit directive or are in fact segregated on the basis of race, color, religion, or national origin, because of habit, local custom, or otherwise. The Bidder agrees that (except where it has obtained identical certifications from proposed subcontractors for specific time periods) it will obtain identical certifications from proposed subcontractors prior to the award of subcontracts exceeding $10,000 which are not exempt from the provisions of the Equal Opportunity Clause, and that it will retain such certifications in its files.
        Section 2. During the performance of this contract, the Contractor agrees as follows:
        (a) The Contractor will not discriminate against any employee or applicant for employment because of race, color, religion, sex or national origin. The Contractor will take affirmative action to ensure that applicants are employed, and that employees are treated during employment without regard to their race, color, religion, sex or national origin. Such action shall include, but not be limited to, the following: employment, upgrading, demotion or transfer; recruitment or recruitment advertising; layoff or termination; rates of pay or other forms of compensation; and selection for training, including apprenticeship. The Contractor agrees to post in conspicuous places available to employees and applicants for employment, notices to be provided setting forth the provisions of this nondiscrimination clause.
        (b) The Contractor will, in all solicitations or advertisements for employees placed by or on behalf of the Contractor, state that all qualified applicants shall receive consideration for employment without regard to race, color, religion, sex or national origin.
        (c) The Contractor will send to each labor union or representative of workers with which the Bidder has a collective bargaining agreement or other contract or understanding, a notice to be provided advising the said labor union or workers' representative of the Contractor's commitments under this section, and shall post copies of the notice in conspicuous places available to employees and applicants for employment.
        (d) The Contractor will comply with all provisions of Executive Order 11246 of September 24, 1965, and of the rules, regulations and relevant orders of the Secretary of Labor.
        (e) The Contractor will furnish all information and reports required by Executive Order 11246 of September 24, 1965, and by rules, regulations and orders of the Secretary of Labor, or pursuant thereto, and will permit access to the Contractor's books, records and accounts by the administering agency and the Secretary of Labor for purposes of investigation to ascertain compliance with such rules, regulations and orders.
        (f) In the event of the Contractor's noncompliance with the nondiscrimination clauses of this contract or with any of the said rules, regulations or orders, this contract may be canceled, terminated or suspended in whole or in part and the Contractor may be declared ineligible for further Government contracts or federally assisted construction contracts in accordance with procedures authorized in Executive Order 11246 of September 24, 1965, and such other sanctions as may be imposed and remedies invoked as provided in the said Executive Order 11246 of September 24, 1965, or by rule, regulation or order of the Secretary of Labor, or as otherwise provided by law.
        (g) The Contractor will include the portion of the sentence immediately preceding paragraph (a) and the provisions of paragraphs (a) through (g) in every subcontract or purchase order unless exempted by rules, regulations or orders of the Secretary of Labor issued pursuant to Section 204 of Executive Order 11246 of September 24, 1965, so that such provisions will be binding upon each subcontractor or vendor. The Contractor will take such action with respect to any subcontract or purchase order as the administering agency may direct as a means of enforcing such provisions, including actions for noncompliance: Provided, however, that in the event a contractor becomes involved in, or is threatened with, litigation with a subcontractor or vendor as a result of such direction by the administering agency, the Contractor may request the United States to enter into such litigation to protect the interests of the United States.
        Section 3. Equal Employment Opportunity Specifications.
        (a) As used in these specifications:
        ``Covered area'' means the geographical area described in the solicitation from which this contract resulted;
        ``Director'' means Director, Office of Federal Contract Compliance Programs, United States Department of Labor, or any person to whom the Director delegates authority;
        ``Employer identification number'' means the Federal Social Security number used on the Employer's Quarterly Federal Tax Return, U.S. Treasury Department Form 941; and
        ``Minority'' includes:
        (i) Black (all persons having origins in any of the Black African racial groups not of Hispanic origin);
        (ii) Hispanic (all persons of Mexican, Puerto Rican, Cuban, Central or South American or other Spanish Culture or origin, regardless of race);
        (iii) Asian and Pacific Islander (all persons having origins in any of the original peoples of the Far East, Southeast Asia, the Indian Subcontinent, or the Pacific Islands); and
        (iv) American Indian or Alaskan Native (all persons having origins in any of the original peoples of North America and maintaining identifiable tribal affiliations through membership and participation or community identification).
        (b) Whenever the Contractor, or any Subcontractor at any tier, subcontracts a portion of the work involving any construction trade, it shall physically include in each subcontract in excess of $10,000 the provisions of these specifications and the Notice which contains the applicable goals for minority and female participation and which is set forth in the solicitations from which this contract resulted.
        (c) If the Contractor is participating (pursuant to 41 CFR 60 - 4.5) in a Hometown Plan approved by the U.S. Department of Labor in the covered area either individually or through an association, its affirmative action obligations on all work in the Plan area (including goals and timetables) shall be in accordance with that Plan for those trades which have unions participating in the Plan. Contractors must be able to demonstrate their participation in and compliance with the provisions of any such Hometown Plan. Each Contractor or Subcontractor participating in an approved Plan is individually required to comply with its obligations under the EEO clause, and to make a good faith effort to achieve each goal under the Plan in each trade in which it has employees. The overall good faith performance by other Contractors or Subcontractors toward a goal in an approved Plan does not excuse any covered Contractor's or Subcontractor's failure to take good faith efforts to achieve the Plan goals and timetables.
        (d) The Contractor shall implement the specific affirmative action standards provided in paragraphs (g) (i) through (xvi) of these specifications. The goals set forth in the solicitation from which this contract resulted are expressed as percentages of the total hours of employment and training of minority and female utilization the Contractor should reasonably be able to achieve in each construction trade in which it has employees in the covered area. Covered construction contractors performing construction work in geographical areas where they do not have a federal or federally assisted construction contract shall apply the minority and female goals established for the geographical area where the work is being performed. Goals are published periodically in the Federal Register in notice form, and such notices may be obtained from any Office of Federal Contract Compliance Programs office or from Federal procurement contracting officers. The Contractor is expected to make substantially uniform progress in meeting its goals in each craft during the period specified.
        (e) Neither the provisions of any collective bargaining agreement, nor the failure by a union with whom the Contractor has a collective bargaining agreement, to refer either minorities or women shall excuse the Contractor's obligations under these specifications, Executive Order 11246, or the regulations promulgated pursuant thereto.
        (f) In order for the nonworking training hours of apprentices and trainees to be counted in meeting the goals, such apprentices and trainees must be employed by the Contractor during the training period, and the Contractor must have made a commitment to employ the apprentices and trainees at the completion of their training, subject to the availability of employment opportunities. Trainees must be trained pursuant to training programs approved by the U.S. Department of Labor.
        (g) The Contractor shall take specific affirmative actions to ensure equal employment opportunity. The evaluation of the Contractor's compliance with these specifications shall be based upon its effort to achieve maximum results from its actions. The Contractor shall document these efforts fully, and shall implement affirmative action steps at least as extensive as the following:
        (i) Ensure and maintain a working environment free of harassment, intimidation, and coercion at all sites, and in all facilities at which the Contractor's employees are assigned to work. The Contractor, where possible, will assign two or more women to each construction project. The Contractor shall specifically ensure that all foremen, superintendents, and other on-site supervisory personnel are aware of and carry out the Contractor's obligation to maintain such a working environment, with specific attention to minority or female individuals working at such sites or in such facilities.
        (ii) Establish and maintain a current list of minority and female recruitment sources, provide written notification to minority and female recruitment sources and to community organizations when the Contractor or its unions have employment opportunities available, and maintain a record of the organizations' responses.
        (iii) Maintain a current file of the names, addresses and telephone numbers of each minority and female off-the-street applicant and minority or female referral from a union, a recruitment source or community organization and of what action was taken with respect to each such individual. If such individual was sent to the union hiring hall for referral and was not referred back to the Contractor by the union or, if referred, not employed by the Contractor, this shall be documented in the file with the reason therefore, along with whatever additional actions the Contractor may have taken.
        (iv) Provide immediate written notification to the Director when the union or unions with which the Contractor has a collective bargaining agreement has not referred to the Contractor a minority person or woman sent by the Contractor, or when the Contractor has other information that the union referral process has impeded the Contractor's efforts to meet its obligations.
        (v) Develop on-the-job training opportunities and/or participate in training programs for the area which expressly include minorities and women, including upgrading programs and apprenticeship and trainee programs relevant to the Contractor's employment needs, especially those programs funded or approved by the Department of Labor. The Contractor shall provide notice of these programs to the sources compiled under (g)(ii) above.
        (vi) Disseminate the Contractor's EEO policy by providing notice of the policy to unions and training programs and requesting their cooperation in assisting the Contractor in meeting its EEO obligations; by including it in any policy manual and collective bargaining agreement; by publicizing it in the company newspaper, annual report, etc.; by specific review of the policy with all management personnel and with all minority and female employees at least once a year; and by posting the company EEO policy on bulletin boards accessible to all employees at each location where construction work is performed.
        (vii) Review, at least annually, the company's EEO policy and affirmative action obligations under these specifications with all employees having any responsibility for hiring, assignment, layoff, termination or other employment decisions including specific review of these items with onsite supervisory personnel such as Superintendents, General Foremen, etc., prior to the initiation of construction work at any job site. A written record shall be made and maintained identifying the time and place of these meetings, persons attending, subject matter discussed, and disposition of the subject matter.
        (viii) Disseminate the Contractor's EEO policy externally by including it in any advertising in the news media, specifically including minority and female news media, and providing written notification to and discussing the Contractor's EEO policy with other Contractors and Subcontractors with whom the Contractor does or anticipates doing business.
        (ix) Direct its recruitment efforts, both oral and written, to minority, female and community organizations, to schools with minority and female students and to minority and female recruitment and training organizations serving the Contractor's recruitment area and employment needs. Not later than one month prior to the date for the acceptance of applications for apprenticeship or other training by any recruitment source, the Contractor shall send written notification to organizations such as the above, describing the openings, screening procedures, and tests to be used in the selection process.
        (x) Encourage present minority and female employees to recruit other minority persons and women and, where reasonable, provide after school, summer and vacation employment to minority and female youth both on the site and in other areas of a Contractor's work force.
        (xi) Validate all tests and other selection requirements where there is an obligation to do so under 41 CFR Part 60 - 3.
        (xii) Conduct, at least annually, an inventory and evaluation at least of all minority and female personnel for promotional opportunities and encourage these employees to seek or to prepare for, through appropriate training, etc., such opportunities.
        (xiii) Ensure that seniority practices, job classifications, work assignments and other personnel practices, do not have a discriminatory effect by continually monitoring all personnel and employment related activities to ensure that the EEO policy and the Contractor's obligations under these specifications are being carried out.
        (xiv) Ensure that all facilities and company activities are nonsegregated except that separate or single-user toilet and necessary changing facilities shall be provided to assure privacy between the sexes.
        (xv) Document and maintain a record of all solicitations of offers for subcontracts from minority and female construction contractors and suppliers, including circulation of solicitations to minority and female contractor associations and other business associations.
        (xvi) Conduct a review, at least annually, of all supervisors' adherence to and performance under the Contractor's EEO policies and affirmative action obligations.
        (h) Contractors are encouraged to participate in voluntary associations which assist in fulfilling one or more of their affirmative action obligations (g) (i) through (xvi). The efforts of a contractor association, joint contractor-union, contractor-community, or other similar group of which the Contractor is a member and participant, may be asserted as fulfilling any one or more of its obligations under (g) (i) through (xvi) of these specifications provided that the Contractor actively participates in the group, makes every effort to assure that the group has a positive impact on the employment of minorities and women in the industry, ensures that the concrete benefits of the program are reflected in the Contractor's minority and female workforce participation, makes a good faith effort to meet its individual goals and timetables, and can provide access to documentation which demonstrates the effectiveness of actions taken on behalf of the Contractor. The obligation to comply, however, is the Contractor's and failure of such a group to fulfill an obligation shall not be a defense for the Contractor's noncompliance.
        (i) A single goal for minorities and a separate single goal for women have been established. The Contractor, however, is required to provide equal employment opportunity and to take affirmative action for all minority groups, both male and female, and all women, both minority and non-minority. Consequently, the Contractor may be in violation of Executive Order 11246 if a particular group is employed in a substantially disparate manner (for example, even though the Contractor has achieved its goals for women generally, the Contractor may be in violation of Executive Order 11246 if a specific minority group of women is underutilized).
        (j) The Contractor shall not use the goals and timetables or affirmative action standards to discriminate against any person because of race, color, religion, sex, or national origin.
        (k) The Contractor shall not enter into any Subcontract with any person or firm debarred from Government contracts pursuant to Executive Order 11246.
        (l) The Contractor shall carry out such sanctions and penalties for violation of these specifications and of the Equal Opportunity Clause, including suspension, termination and cancellation of existing subcontracts as may be imposed or ordered pursuant to Executive Order 11246, as amended, and its implementing regulations, by the Office of Federal Contract Compliance Programs. Any Contractor who fails to carry out such sanctions and penalties shall be in violation of these specifications and Executive Order 11246, as amended.
        (m) The Contractor, in fulfilling its obligations under these specifications, shall implement specific affirmative action steps, at least as extensive as those standards prescribed in paragraph (g) of these specifications, so as to achieve maximum results from its efforts to ensure equal employment opportunity. If the Contractor fails to comply with the requirements of Executive Order 11246, the implementing regulations, or these specifications, the Director shall proceed in accordance with 41 CFR 60 - 4.8.
        (n) The Contractor shall designate a responsible official to monitor all employment related activity to ensure that the company EEO policy is being carried out, to submit reports relating to the provisions hereof as may be required by the Government and to keep records. Records shall at least include for each employee the name, address, telephone numbers, construction trade, union affiliation if any, employee identification number when assigned, social security number, race, sex, status (e.g., mechanic, apprentice, trainee, helper, or laborer), dates of changes in status, hours worked per week in the indicated trade, rate of pay, and locations at which the work was performed. Records shall be maintained in an easily understandable and retrievable form; however, to the degree that existing records satisfy this requirement, contractors shall not be required to maintain separate records.
        (o) Nothing herein provided shall be construed as a limitation upon the application of other laws which establish different standards of compliance or upon the application of requirements for the hiring of local or other area residents (e.g. those under the Public Works Employment Act of 1977 and the Community Development Block Grant Program).
        Section 4. In this Article VI --
        (a) The term ``Contractor'' shall also mean ``Bidder'' or ``Subcontractor'' as applicable.
        (b) The provisions of sections 2 & 3 are applicable to the extent required by law. In determining whether these Sections are applicable, reference should be made to Office of Federal Contract Compliance Programs regulations (41 CFR part 60).
Article VII
Miscellaneous
        Section 1. Definitions.
        The term ``Completion of the Contract'' shall mean accomplishment of Completion of the Project for all central offices (and associated remote switching terminals), features and services listed under Column 1, ``Project,'' in Article I, Section 1, and all alternates accepted by the Owner, on the Owner's Acceptance.
        The term ``Completion of Installation'' shall mean full performance by the Bidder of the Bidder's obligation under the Contract and all amendments and revisions thereof, for a Project, except that it shall not include the acceptance tests nor performance of the Bidder's obligations in respect of (i) releases of lien and Certificate of Contractor under Article III, section 2, hereof and (ii) other final documents. The actual date of Completion of Installation shall be the date the Bidder submits to the Owner written notification that the Project is completed in conformance with the Specifications and ready for the Owner's acceptance inspection and tests as provided for under Article II, section 4.
        The term ``Completion of the Project'' shall mean full performance by the Bidder of the Bidder's obligations herein set out and all amendments and revisions thereof for a central office (and all associated remote switching terminals), feature or service. The scheduled date for Completion of the Project is sixty (60) days after Completion of Installation as specified under Column 7, ``Completion of Installation,'' in Article I, section 1, as amended or adjusted under Article II, section 1, and section 4. The scheduled date for Completion of the Project is the date from which liquidated damages are computed. The actual date of Completion of the Project shall be the date of the receipt by the Owner from the Bidder of (a) all documents listed in Article III, section 2, (b) other final documents, and (c) written notification that all deficiencies listed on the RUS Form 517, Results of Acceptance Test, have been corrected; provided, that the final inspection and tests by the Owner finds the deficiencies satisfactorily resolved. If the deficiencies have not been satisfactorily resolved, the actual date of Completion of the Project shall be the date that the deficiencies are fully and satisfactorily resolved as determined by subsequent Owner's tests. The Certificate of Completion approved and signed by the Owner and approved in writing by the Administrator shall be conclusive evidence as to the fact of Completion of the Project and the date thereof. Full compliance with the procedure for ``Completion of the Project'' and an individual Certificate of Completion is required for each Project listed under Column 1, ``Project,'' in Article I, section 1.
        The Contract shall consist of the Notice and Instructions to Bidders, the Bidder's Proposal and the Owner's Acceptance, the Contractor's Bond and the Specifications.
        The term ``days'' shall mean calendar days.
        The term ``minor errors or irregularities'' shall mean a defect or variation in a Bidder's bid that is a matter of form and not of substance. Errors or irregularities are ``minor'' if they can be corrected or waived without being prejudicial to other Bidders and when they do not affect the price, quantity, quality, or timeliness of construction. Unless otherwise noted, the borrower determines whether an error or irregularity is ``minor.''
        The term ``placed in service'' shall mean used by the Owner to earn revenue.
        The term ``Project'' shall mean a central office and all associated remote switching terminals (if any), a remote switching terminal if purchased without a supporting central office, a feature (or group of features), or a service (or group of services), which is listed under Column 1, ``Project,'' in Article I, section 1. The only instance in which a remote switching terminal can constitute a separate Project is where such remote switching terminal is purchased with associated modifications to its supporting host switch but no other modifications to the host switch are specified. A Project will have a single completion schedule listed under Column 7, ``Completion of Installation,'' in Article I, section 1, and a single liquidated damages amount shown in Article V, section 2. The Contract may consist of one or more Projects.
        The term ``Software'' shall mean computer programs contained on a tape, disc, semiconductor device or other memory device or system memory consisting of logic instructions and instruction sequences in machine-readable object code, which manipulate data in the central processor, control and perform input/output operations, perform error diagnostic and recovery routines, control call processing, and perform peripheral control, and administrative and maintenance functions; as well as associated documentation, excluding source code, used to describe, maintain and use the programs provided under the Contract.
        The term ``Specifications'' shall mean the minimum performance requirements of the Owner as contained in the documents listed below, which are either attached or become a part of the Contract by reference, as amended by specific written exceptions contained in the Bidder's proposal and accepted by the Owner and the Administrator:
RUS Form XXXXX, dated XXXX
RUS Form XXXXX, dated XXXX
        Section 2. Continuing Equipment Support -- Parts, Service, and Software. In addition to warranty repairs and replacement, the Bidder shall offer repair service and repair parts to the Owner in accordance with the Bidder's practices and terms then in effect, for the Bidder's manufactured equipment furnished pursuant to this Agreement. Such repair service or repair parts shall be available for as long as the Bidder is manufacturing or stocking such equipment, or for no less than eight (8) years after the Bidder has ceased manufacturing or offering for sale such equipment. The Bidder shall also offer software support services to the Owner in accordance with the Bidder's practices, terms, and charges then in effect, but in any event for no less than five (5) years after the Bidder has ceased manufacturing or offering for sale such software.
        Section 3. Materials and Supplies. The Bidder shall use only such unmanufactured articles, materials and supplies as have been mined or produced in the United States, Mexico or Canada and only such manufactured articles, materials and supplies as have been manufactured in the United States, Mexico or Canada substantially all from articles, materials or supplies mined, produced or manufactured, as the case may be, in the United States, Mexico or Canada; provided that foreign articles, materials or supplies may be used in the event and to the extent that the Administrator shall expressly authorize in writing such use pursuant to the provisions of the Rural Electrification Act of 1938, being Title IV of Public Resolution No. 122, 75th Congress, approved June 21, 1938. The Bidder agrees to submit to the Owner such certificate or certificates, signed by the Bidder and all subcontractors, with respect to compliance with the foregoing provision as the Administrator from time to time may require.
        Section 4. Bond. The Bidder shall furnish to the Owner a Contractor's Bond in conformance with the requirements of 7 CFR part 1788, subpart C.
        Section 5. Confidentiality. All information supplied by the Bidder to the Owner which bears a legend or notice restricting its use, copying, or dissemination, except insofar as it may be in the public domain through no acts attributable to the Owner, shall be treated by the Owner as confidential information, and the Owner shall not reproduce any such information except for its own internal use and as authorized by this Contract, and shall use any information only for archival backup, in-house training, operating, maintenance and administrative purposes and in conjunction with its use of the equipment, materials and software furnished hereunder. All information supplied to the Bidder by the Owner which bears a legend or notice restricting its use, copying, or dissemination, except insofar as it may be in the public domain through no acts attributable to the Bidder, shall be treated by the Bidder as confidential information, and shall not be used by the Bidder for any purpose adverse to the interests of the Owner, and shall not be reproduced or distributed by the Bidder except for the Bidder's use in its performance under this Contract. The foregoing confidentiality obligations do not apply to information which is independently developed by the receiving party or which is lawfully received by the receiving party free of restriction from another source having a right to so furnish such information, or is already known to the receiving party at the time of disclosure free of restriction. If the Bidder has failed to provide continuing equipment support as described in Article VII, section 2, the Owner is released from this obligation. This provision does not restrict release of information by the United States of America pursuant to the Freedom of Information Act or other legal process.
        Section 6. Entire Agreement. The terms and conditions of this Contract as approved by RUS supersede all prior oral or written understandings between the parties. There are no understandings or representations, expressed or implied, not expressly set forth herein.
        Section 7. Survival of Obligations. The rights and obligations of the parties, which by their nature, would continue beyond the termination, cancellation, or expiration of this Contract, shall survive such termination or expiration.
        Section 8. Non-Waiver. No waiver of any terms or conditions of this Contract, or the failure of either party to enforce strictly any such term or condition on one or more occasions, shall be construed as a waiver of the same or of any other terms or conditions of this Contract on any other occasion.
        Section 9. Releases Void. Neither party shall require releases or waivers of any personal rights from representatives or employees of the other in connection with visits to its premises, nor shall such parties plead such releases or waivers in any action or proceeding.
        Section 10. License. The Bidder shall comply with all applicable construction codes.
        (a) The Bidder warrants that it possesses contractor's license number XXXX issued to it by the State of XXXX in which the project(s) is located, and said license expires on XXXX, 19XX.
        (b) The Bidder warrants that no license is required in the state in which the Project(s) is located.
        (Bidder shall cross out that subsection that does not apply)
        Section 11. Nonassignment of Contract. The Bidder shall not assign the Contract, effected by acceptance of this Proposal, or any part hereof, or enter into any contract with any person, firm or corporation, for the performance of the Bidder's obligations hereunder, or any part hereof, without the approval in writing of the Owner, the Surety, and the Administrator. However, the Bidder may subcontract the whole or any part of the installation work to be performed at the installation site, (as distinguished from furnishing and delivery of equipment and materials), provided that; (a) the Bidder shall remain responsible for the performance thereof and (b) the Bidder shall obtain the consent of the surety to such subcontract. A copy of such consent shall be submitted to the Owner and the Administrator.
        Section 12. Choice of Law. The rights and obligations of the parties and all interpretations and performance of this Contract shall be governed in all respects by the laws of the State of XXXXX except for its rules with respect to the conflict of laws.
        Section 13. Approval of the Administrator. The acceptance of this proposal by the Owner shall not create a contract unless such acceptance shall be approved in writing by the Administrator within ninety (90) days after the date hereof:
By
(Signature of Bidder)
_
(Name -- Type or Print)
_
(Title)
_
(Company Name of Bidder)
_
_
(Address of Bidder)
Attest:
_
(Secretary)
_
(Date)
The Proposal must be signed with the full name of the Bidder. In the case of a partnership the Proposal must be signed in the firm name by each partner. In the case of a corporation the Proposal must be signed in the corporate name by a duly authorized officer and the Corporate seal affixed and attested by the Secretary of the Corporation.
(If executed by other than the President, a Vice-President, a partner or the individual owner, a power of attorney or other legally acceptable document authorizing execution shall accompany this contract, unless such power of attorney is on file with RUS.)
Acceptance
        Subject to the approval of the Administrator, the Owner hereby accepts the Proposal of XXXXXXXXXXXXXX
_
for the Project(s) herein described for the Total Base Bid of
(TABLE START)
$ XXXXXXX and
@h1
@h1
        Alternate For:
Spare Parts, Item(s) .... $ XXXX
Maintenance Tools, Item(s) .... $ XXXX
Alternate No. 1 (add) (deduct) .... $ XXXX
Alternate No. 2 (add) (deduct) .... $ XXXX
Alternate No. 3 (add) (deduct) .... $ XXXX
Alternate No. 4 (add) (deduct) .... $ XXXX
Alternate No. 5 (add) (deduct) .... $ XXXX
Alternate No. 6 (add) (deduct) .... $ XXXX
The total contract price is .... $ XXXX
(TABLE END)
By
OWNER
ATTEST:
PRESIDENT
_
SECRETARY
_
DATE OF ACCEPTANCE
[End of clause]
(The information collection and recordkeeping requirements of this section have been approved by the Office of Management and Budget (OMB) under control number 0572 - 0059)
[59 FR 31126, June 17, 1994, as amended at 60 FR 1711, Jan. 5, 1995]
__1755.526 -- 1755.859 [Reserved]
_1755.860   RUS specification for filled buried wires.
        (a) Scope. (1) This section covers the requirements for filled buried wires intended for direct burial as a subscriber drop and/or distribution wire.
        (i) The conductors are solid copper, individually insulated with an extruded solid insulating compound.
        (ii) The insulated conductors are twisted into pairs (a star-quad configuration is permitted for the two pair wires) which are then stranded or oscillated to form a cylindrical core.
        (iii) A moisture resistant filling compound is applied to the stranded conductors completely covering the insulated conductors and filling the interstices between the pairs.
        (iv) The wire structure is completed by the application of an optional core wrapping material, an inner jacket, a flooding compound, a shield, a flooding compound, and an overall plastic jacket.
        (2) The number of pairs and gauge size of conductors which are
(TABLE START)used within the RUS program are provided in the following table:
@h1
@h1
@h1
        American Wire Gauge (AWG)  .... 22  .... 24
        Pairs  .... 2  .... 2
           .... 3  .... 3
(TABLE END)
        (3) All wires sold to RUS borrowers for projects involving RUS loan funds under this section must be accepted by RUS Technical Standards Committee ``A'' (Telephone). For wires manufactured to the specification of this section, all design changes to an accepted design must be submitted for acceptance. RUS will be the sole authority on what constitutes a design change.
        (4) Materials, manufacturing techniques, or wire designs not specifically addressed by this section may be allowed if accepted by RUS. Justification for acceptance of modified materials, manufacturing techniques, or wire designs must be provided to substantiate product utility and long term stability and endurance.
        (5) The American National Standards Institute/Electronic Industries Association (ANSI/EIA) 359-A-84, EIA Standard Colors for Color Identification and Coding, referenced in this section is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of ANSI/EIA 359-A-84 are available for inspection during normal business hours at RUS, room 2845, U.S Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from EIA, 2001 Pennsylvania Avenue, NW., suite 900, Washington, DC 20006, telephone number (202) 457 - 4966.
        (6) American Society for Testing and Materials specifications (ASTM) A 505 - 87, Standard Specification for Steel, Sheet and Strip, Alloy, Hot-Rolled and Cold-Rolled, General Requirements for; ASTM B 3 - 90, Standard Specification for Soft or Annealed Copper Wire; ASTM B 193 - 87, Standard Test Method for Resistivity of Electrical Conductor Materials; ASTM B 224 - 91, Standard Classification of Coppers; ASTM B 694 - 86, Standard Specification for Copper, Copper Alloy, and Copper-Clad Stainless Steel Sheet and Strip for Electrical Cable Shielding; ASTM D 150 - 87, Standard Test Methods for A-C Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulating Materials; ASTM D 257 - 91, Standard Test Methods for D-C Resistance or Conductance of Insulating Materials; ASTM D 1238 - 90b, Standard Test Method for Flow Rates of Thermoplastics by Extrusion Plastometer; ASTM D 1248 - 84(1989), Standard Specification for Polyethylene Plastics Molding and Extrusion Materials; ASTM D 1535 - 89, Standard Test Method for Specifying Color by the Munsell System; ASTM D 3349 - 86, Standard Test Method for Absorption Coefficient of Carbon Black Pigmented Ethylene Plastic; ASTM D 4101 - 82(1988), Standard Specification for Propylene Plastic Injection and Extrusion Materials; ASTM D 4565 - 90a, Standard Test Methods for Physical and Environmental Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable; ASTM D 4566 - 90, Standard Test Methods for Electrical Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable; ASTM D 4568 - 86, Standard Test Methods for Evaluating Compatibility between Cable Filling and Flooding Compounds and Polyolefin Cable Materials; ASTM D 4872 - 88, Standard Test Method for Dielectric Testing of Wire and Cable Filling Compounds; ASTM E 8 - 91, Standard Test Methods of Tension Testing of Metallic Materials; and ASTM E 29 - 90, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications, referenced in this section are incorporated by reference by RUS. These incorporations by references were approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of the ASTM standards are available for inspection during normal business hours at RUS, room 2845, U.S. Department Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from ASTM, 1916 Race Street, Philadelphia, Pennsylvania 19103 - 1187, telephone number (215) 299 - 5585.
        (b) Conductors and conductor insulation. (1) Each conductor must be a solid round wire of commercially pure annealed copper. Conductors must meet the requirements of the American Society for Testing and Materials (ASTM) B 3 - 90 except that requirements for Dimensions and Permissible Variations are waived and elongation requirements are superseded by this section.
        (2) The minimum conductor elongation in the final wire must comply
(TABLE START)with the following limits when tested in accordance with ASTM E 8 - 91.
@h1Conductor -- AWG
@h1Minimum Elongation -- Percent
        22  .... 20
        24  .... 16
(TABLE END)
        (3) Joints made in conductors during the manufacturing process may be brazed, using a silver alloy solder and nonacid flux, or they may be welded using either an electrical or cold welding technique. In joints made in uninsulated conductors, the two conductor ends must be butted. Splices made in insulated conductors need not be butted but may be joined in a manner acceptable to RUS.
        (4)(i) The tensile strength of any section of a conductor containing a factory joint must not be less than 85 percent of the tensile strength of an adjacent section of the solid conductor of equal length without a joint.
        (ii) Engineering Information: The sizes of wire used and
(TABLE START)their nominal diameters shall be as shown in the following table:
@h1AWG
@h1Nominal Diameter@h2Millimeters (mm)@h2(Inches (in.))
        22  .... 0.643  .... (0.0253)
        24  .... 0.511  .... (0.0201)
(TABLE END)
        (5) Each conductor must be insulated with either a colored, solid, insulating grade, high density polyethylene or crystalline propylene/ethylene copolymer or with a solid natural primary layer and a colored, solid outer skin using one of the insulating materials listed in paragraphs (b)(5)(i) through (b)(5)(ii) of this section.
        (i) The polyethylene raw material selected to meet the requirements of this section must be Type III, Class A, Category 4 or 5, Grade E9, in accordance with ASTM D 1248 - 84(1989).
        (ii) The crystalline propylene/ethylene raw material selected to meet the requirements of this section must be Class PP 200B 40003 E11 in accordance with ASTM D 4101 - 82(1988).
        (iii) Raw materials intended as conductor insulation furnished to these requirements must be free from dirt, metallic particles, and other foreign matter.
        (iv) All insulating raw materials must be accepted by RUS prior to their use.
        (6) All conductors in any single length of wire must be insulated with the same type of material.
        (7) A permissible overall performance level of faults in conductor insulation must average not greater than one fault per 12,000 conductor meters (40,000 conductor feet) for each gauge of conductor.
        (i) All insulated conductors must be continuously tested for insulation faults during the twinning operation with the method of test acceptable to RUS. The length count and number of faults must be recorded. The information must be retained for a period of 6 months and be available for review by RUS when requested.
        (ii) The voltages for determining compliance with the requirements
(TABLE START)of this section are as follows:
@h1AWG
@h1Direct Current Voltages (Kilovolts)
        22  .... 6.0
        24  .... 5.0
(TABLE END)
        (8) Repairs to the conductor insulation during manufacturing are permissible. The method of repair must be accepted by RUS prior to its use. The repaired insulation must be capable of meeting the relevant electrical requirements of this section.
        (9) All repaired sections of insulation must be retested in the same manner as originally tested for compliance with paragraph (b)(7) of this section.
        (10) Colored insulating material removed from or tested on the conductor, from a finished wire, must be capable of meeting the following
(TABLE START)performance requirements:
@h1Property
@h1Polyethylene
@h1Crystalline Propylene/Ethylene Copolymer
        Melt Flow Rate  ....   ....
Percent increase from raw material, Maximum  ....   ....
<0.5 (Initial Melt Index)  .... 50  ....    --
0.5 - 2.00 (Initial Melt Index)  .... 25  ....    --
>5.0 (Initial Melt Index)  ....    --   .... 110
        Tensile Strength -- Minimum ....   ....
Megapascals (MPa)  .... 16.5  .... 21.0
(Pounds per Square Inch (psi))  .... (2,400)  .... (3,000)
        Ultimate Elongation ....   ....
Minimum, Percent  .... 300  .... 300
        Cold Bend ....   ....
Failures, Maximum  .... 0/10  .... 0/10
        Shrinkback ....   ....
Maximum, mm (in.)  .... 10 (0.375)  .... 10 (0.375)
        Oxygen Induction Time
Minimum, Minutes  .... 20  .... 20
(TABLE END)
        (11) Testing procedures. The procedures for testing the insulation samples for compliance with paragraph (b)(10) of this section must be as follows.
        (i) Melt flow rate. The melt flow rate must be determined as described in ASTM D 1238 - 90b. Condition E must be used for polyethylene. Condition L must be used for crystalline propylene/ethylene copolymer. The melt flow test must be conducted prior to the filling operation.
        (ii) Tensile strength and ultimate elongation. Samples of the insulation material, removed from the conductor, must be tested in accordance with ASTM D 4565 - 90a using the following conditions. The minimum length of unclamped specimen must be 50 mm (2.0 in.). The minimum speed of jaw separation must be 25 mm (1.0 in.) per minute per 25 mm (1.0 in.) of unclamped specimen. The temperature of specimens and surrounding shall be 23 1B 1C.
        Note: Quality assurance testing at a jaw separation speed of 500 mm/min (20 in./min) is permissible. Failures at this rate must be retested at the 50 mm/min (2 in./min) rate to determine section compliance.
        (iii) Cold bend. Samples of the insulation material on the conductor must be tested in accordance with ASTM D 4565 - 90a at a temperature of 40 1B 1C with a mandrel diameter equal to 3 times the outside diameter of the insulated conductor. There must be no cracks visible to normal or corrected-to-normal vision.
        (iv) Shrinkback. Samples of insulation must be tested for four hours in accordance with ASTM D 4565 - 90a. The temperature for the type
(TABLE START)of material is listed as follows:
@h1Material
@h1Temperature
        Polyethylene  .... 115 1B 1C
        Crystalline propylene/ethylene Copolymer  .... 130 1B 1C
(TABLE END)
        (v) Oxygen induction time. Samples of insulation, which have been conditioned in accordance with paragraph 17.3 of ASTM D 4565 - 90a, must be tested in accordance with the procedures of ASTM D 4565 - 90a using copper pans and a test temperature of 199 1B 1C.
        (12) Other methods of testing may be used if acceptable to RUS.
        (c) Identification of pairs and twisting of pairs. (1) The insulation must be colored to identify:
        (i) The tip and ring conductor of each pair; and
        (ii) Each pair in the completed wire.
        (2) The colors to be used to provide identification of the tip and
(TABLE START)ring conductor of each pair are shown in the following table:
@h1Pair No.
@h1Color@h2Tip@h2Ring
        1  .... White  .... Blue
        2  .... White  .... Orange
        3  .... White  .... Green
(TABLE END)
        (3) Standards of color. The colors of the insulated conductors supplied in accordance with this section are specified in terms of the Munsell Color System (ASTM D 1535 - 89) and must comply with the ``Table of Wire and Cable Limit Chips'' as defined in ANSI/EIA-359-A-84. (Visual color standards meeting these requirements may be obtained directly from the Munsell Color Company, Inc., 2441 North Calvert Street, Baltimore, Maryland 21218).
        (4) Positive identification of the tip and ring conductors of each pair by marking each conductor of a pair with the color of its mate is permissible. The method of marking must be accepted by RUS prior to its use.
        (5) Other methods of providing positive identification of the tip and ring conductors of each pair may be employed if accepted by RUS prior to its use.
        (6) The insulated conductors must be twisted into pairs.
        (7) In order to provide sufficiently high crosstalk isolation, the pair twists must be designed to enable the wire to meet the capacitance unbalance and the crosstalk loss requirements of paragraphs (m)(2), (m)(3), and (m)(4) of this section.
        (8) The average length of pair twists in any pair in the finished wire, when measured on any 3 meter (m) (10 foot(ft)) length, must not exceed 152 mm (6 in.).
        (9) An alternative method of forming the two pair wire is the use of a star-quad configuration.
        (i) The assembly of the star-quad must be such as to enable the wire to meet the capacitance unbalance and the crosstalk loss requirements of paragraphs (m)(2), (m)(3), and (m)(4) of this section.
        (ii) The four individual insulated conductors must be twisted together to form a star-quad configuration with the tip and ring conductors of each pair diagonally opposite each other in the quad.
        (iii) The average length of twist for the star-quad in the finished wire, when measured on any 3 m (10 ft) length, must not exceed 152 mm (6 in.).
        (iv) The following color scheme must be used to provide
(TABLE START)identification of the tip and ring conductor of each pair in the star-quad:
@h1Pair No.
@h1Color@h2Tip@h2Ring
        1  .... White with blue stripe  .... Blue
        2  .... White with orange stripe  .... Orange
(TABLE END)
        (v) If desired, the blue and orange conductors may contain a white stripe. The stripes in this case must be narrow enough so that the tip and ring identification is obvious.
        (d) Forming of the wire core. (1) Twisted pairs or star-quad configuration must be assembled in such a way as to form a substantially cylindrical group.
        (2) The filling compound must be applied to the wire core in such a way as to provide a completely filled core as is commercially practical.
        (3) If desired for manufacturing reasons, white or colored binders of nonhygroscopic and nonwicking material may be applied over the core.
        (e) Filling compound. (1) After or during the stranding operation and prior to application of the optional core wrap and inner jacket, a homogeneous filling compound free of agglomerates must be applied to the wire core. The compound must be as nearly colorless as is commercially feasible and consistent with the end product requirements and pair identification.
        (2) The filling compound must be free from dirt, metallic particles, and other foreign matter. It must be applied in such a way as to fill the space within the wire core.
        (3) The filling compound must be nontoxic and present no dermal hazards.
        (4) The filling compound must exhibit the following dielectric properties at a temperature of 23 1B 3C when measured in accordance with ASTM D 150 - 87 or ASTM D 4872 - 88.
        (i) The dissipation factor must not exceed 0.0015 at a frequency of 1 megahertz (MHz).
        (ii) The dielectric constant must not exceed 2.30.
        (5) The volume resistivity must not be less than 1012 ohm-cm at a temperature of 23 1B 3C when measured in accordance with ASTM D 257 - 91 or ASTM D 4872 - 88.
        (6) The individual wire manufacturer must satisfy RUS that the filling compound selected for use is suitable for its intended application. The filling compound must be compatible with the wire components when tested in accordance with ASTM D 4568 - 86 at a temperature of 80C.
        (f) Core wrap (optional). (1) When a core wrap is used, it must consist of a layer of nonhygroscopic and nonwicking dielectric material. The wrap must be applied with an overlap.
        (2) The core wrap must provide a sufficient heat barrier to prevent visible evidence of conductor insulation deformation or adhesion between conductors, caused by adverse heat transfer during the inner jacketing operation.
        (3) If required for manufacturing reasons, white or colored binders of nonhygroscopic and nonwicking material may be applied over the core wrap.
        (4) Sufficient filling compound must be applied to the core wrap that voids or air spaces existing between the core and inner side of the core wrap are minimized.
        (g) Inner jacket. (1) An inner jacket must be applied over the core and/or core wrap.
        (2) The jacket must be free from holes, splits, blisters, or other imperfections and must be as smooth and concentric as is consistent with the best commercial practice.
        (3) The inner jacket material and test requirements must be as specified for the outer jacket material per paragraphs (j)(3) through (j)(5)(iv) of this section.
        (4) The inner jacket thickness at any point must not be less than 0.5 mm (0.020 in.). The thickness must be determined from measurements on 50 mm (2 in.) samples taken not less than 0.3 m (1 ft) from either end of the wire. The average must be determined from 4 readings taken approximately 90 apart on any cross section of the samples. The maximum and minimum points must be determined by exploratory measurements. The maximum thickness minus the minimum thickness at any cross section must not exceed 43 percent of the average thickness at that cross section.
        (h) Flooding compound. (1) Sufficient flooding compound must be applied on all sheath interfaces so that voids and air spaces in these areas are minimized.
        (2) The flooding compound must be compatible with the jacket when tested in accordance with ASTM D 4568 - 86 at a temperature of 80C. The floodant must exhibit adhesive properties sufficient to prevent jacket slip when tested in accordance with the requirements of appendix A, paragraph (III)(5), of this section.
        (3) The individual wire manufacturer must satisfy RUS that the flooding compound selected for use is acceptable for the application.
        (i) Shield. (1) A shield must be applied either longitudinally or helically over the inner jacket.
        (i) If the shield is applied longitudinally, it must be corrugated.
        (ii) If the shield is applied helically, it must be smooth.
        (2) The overlap for longitudinally applied shields must be a minimum of 2 mm (0.075 in.) The overlap for helically applied shields must be a minimum of 23 percent of the tape width.
        (3) General requirements for application of the shielding material are as follows:
        (i) Successive lengths of shielding tapes may be joined during the manufacturing process by means of cold weld, electric weld, soldering with a nonacid flux, or other acceptable means;
        (ii) Where two ends of a metal shield are to be joined together, care shall be taken to clean the metal surfaces in order to provide for a good mechanical and electrical connection;
        (iii) The shields of each length of wire must be tested for continuity. A one meter (3 ft) section of shield containing a factory joint must exhibit not more than 110 percent of the resistance of a shield of equal length without a joint;
        (iv) The breaking strength of any section of a shield tape containing a factory joint must not be less than 80 percent of the breaking strength of an adjacent section of the shield of equal length without a joint;
        (v) The reduction in thickness of the shielding material due to the corrugating or application process must be kept to a minimum and must not exceed 10 percent at any spot; and
        (vi) The shielding material must be applied in such a manner as to enable the wire to pass the bend test as specified in paragraph (n)(3) of this section.
        (4) The following materials are acceptable for use as wire
(TABLE START)shielding:
@h1Standard Wire
@h1Gopher Resistant Wire
Copper Alloy 220 (Bronze)  .... Copper-Clad Stainless Steel
(0.1016 1B 0.0076 mm)  .... 0.1270 1B 0.0127 mm
(0.0040 1B 0.0003 in.)  .... (0.0050 1B 0.0005 in.)
Copper Alloy 220 (Bronze)  .... Copper Alloy 664
0.1270 1B 0.0127 mm  .... 0.1397 1B 0.0127 mm
(0.0050 1B 0.0005 in.)  .... (0.0055 1B 0.0005 in.)Copper-Clad Alloy Steel0.1270 1B 0.0127 mm(0.0050 1B 0.0005 in.)
(TABLE END)
        (i) The copper-clad steels and copper alloy 664 shielding tapes must be capable of meeting the following performance requirements prior to
(TABLE START)application to the wire:
@h1Property
@h1Requirement
        Tensile Strength ....
Minimum, MPa (psi)  .... 379 (55,000)
        Tensile Yield  ....
Minimum, MPa (psi)  .... 241 (35,000)
        Elongation
Minimum, percent in 50 mm (2 in.)  .... 15
(TABLE END)
        (ii) Copper alloy 220. The shielding material, prior to application to the wire, must be in the fully annealed condition and shall conform to the requirements of ASTM B 694 - 86 for C22000 commercial bronze.
        (iii) Copper-clad stainless steel. In addition to meeting the requirements of paragraph (i)(4)(i) of this section, the shielding material, prior to application to the wire, must be in the fully annealed condition and must conform to the requirements of ASTM B 694 - 86, with a cladding ratio of 16/68/16 and must have a minimum electrical conductivity of 28 percent IACS when measured in accordance with ASTM B 193 - 87.
        (iv) Copper alloy 664. In addition to meeting the requirements of paragraph (i)(4)(i) of this section, the shielding material, prior to application to the wire, must be annealed temper and must conform to the requirements of ASTM B 694 - 86 and must have a minimum electrical conductivity of 28 percent IACS when measured in accordance with ASTM B 193 - 87.
        (v) Copper-clad alloy steel. In addition to meeting the requirements of paragraph (i)(4)(i) of this section, the shielding material, prior to application to the wire, must be in the fully annealed condition and the copper component must conform to the requirements of ASTM B 224 - 91 and the alloy steel component must conform to the requirements of ASTM A 505 - 87, with a cladding ratio of 16/68/16, and must have a minimum electrical conductivity of 28 percent IACS when measured in accordance with ASTM B 193 - 87.
        (j) Outer jacket. (1) The outer jacket must provide the wire with a tough, flexible, protective covering which can withstand exposure to sunlight, to atmospheric temperatures and stresses reasonably expected in normal installation and service.
        (2) The jacket must be free from holes, splits, blisters, or other imperfections and must be as smooth and concentric as is consistent with the best commercial practice.
        (3) The raw material used for the outer jacket must be one of the five types listed in paragraphs (j)(3)(i) through (j)(3)(v) of this section. The raw material must contain an antioxidant to provide long term stabilization and the materials must contain a 2.60 1B 0.25 percent concentration of furnace black to provide ultraviolet shielding. Both the antioxidant and furnace black must be compounded into the material by the raw material supplier.
        (i) Low density, high molecular weight polyethylene (LDHMW) must conform to the requirements of ASTM D 1248 - 84(1989), Type I, Class C, Category 4 or 5, Grade J3.
        (ii) Low density, high molecular weight ethylene copolymer (LDHMW) must conform to the requirements of ASTM D 1248 - 84 (1989), Type I, Class C, Category 4 or 5, Grade J3.
        (iii) Linear low density, high molecular weight polyethylene (LLDHMW) must conform to the requirements of ASTM D 1248 - 84(1989), Type I, Class C, Category 4 or 5, Grade J3.
        (iv) High density polyethylene (HD) must conform to the requirements of ASTM D 1248 - 84(1989), Type III, Class C, Category 4 or 5, Grade J4.
        (v) Medium density polyethylene (MD) must conform to the requirements of ASTM D 1248 - 84(1989), Type II, Class C, Category 4 or 5, Grade J4.
        (vi) Particle size of the carbon selected for use must not average greater than 20 nanometers.
        (vii) Absorption coefficient must be a minimum of 400 in accordance with the procedures of ASTM D 3349 - 86.
        (4) The outer jacketing material removed from or tested on the
(TABLE START)wire must be capable of meeting the following performance requirements:
@h1Property
@h1LLDHMW, Ethylene Copolymer
@h1LDHMW Polyethylene
@h1HD or MD Polyethylene
Melt Flow Rate Percent increase from raw material Maximum  ....    .... 50  .... 50
<0.41 (Initial Melt Index)  .... 100  ....  --   ....  --
0.41 - 2.00 (Initial Melt Index)  .... 50  ....  --   ....  --
Tensile Strength Minimum, MPa (psi)  .... 12.0 (1,700)  .... 12.0 (1,700)  .... 16.5 (2,400)
Ultimate Elongation Percent, Minimum  .... 400  .... 400  .... 300
Shrinkback Percent of Length, Maximum  .... 5  .... 5  .... 5
Impact Failures, Maximum  .... 2/10  .... 2/10  .... 2/10
(TABLE END)
        (5) Testing procedures. The procedures for testing the jacket samples for compliance with paragraph (j)(4) of this section must be as follows:
        (i) Melt flow rate. The melt flow rate must be as determined by ASTM D 1238 - 90b, Condition E. Jacketing material must be free from flooding and filling compound.
        (ii) Tensile strength and ultimate elongation. Test in accordance with ASTM D 4565 - 90a, using a jaw separation speed of 500 mm/min (20 in./min) for low density material and 50 mm/min (2 in./min) for high and medium density materials.
        (iii) Shrinkback. Test in accordance with the procedures specified in ASTM D 4565 - 90a using a test temperature of 100 1B 1C for low density material and a test temperature of 115 1B 1C for high and medium density materials.
        (iv) Impact. The test must be performed in accordance with ASTM D 4565 - 90a using an impact force of 4 newton-meter (3 pound force-foot) at a temperature of 20 1B 2C. The cylinder must strike the sample at the shield overlap. A crack or split in the jacket constitutes failure.
        (6) Jacket thickness. The minimum jacket thickness must be 0.64 mm (0.025 in.) except that the minimum thickness over the sheath slitting cord, if present, must be 0.46 mm (0.018 in.). The minimum point must be determined by exploratory measurements. The average thickness at any cross section must be determined from four readings including the minimum point, taken approximately 90 apart. The thickness measurement must exclude any jacket material that has formed into the corrugation. The maximum thickness at any cross section must not be greater than 155 percent of the minimum thickness.
        (7) Eccentricity. The eccentricity of the jacket must not
(TABLE START)exceed 43 percent when calculated using the formula as follows:
@h1Maximum Thickness  Minimum Thickness@h2Average Thickness
@h10A 100 Percent
 ....
(TABLE END)
        (k) Sheath slitting cord (optional). (1) Sheath slitting cords may be used in the wire structure at the option of the manufacturer.
        (2) When a sheath slitting cord is used it must be nonhygroscopic and nonwicking, continuous throughout a length of wire, and of sufficient strength to open the sheath without breaking the cord.
        (3) Sheath slitting cords must be capable of consistently slitting the jacket(s) and/or shield for a continuous length of 0.6 m (2 ft) when tested in accordance with the procedure specified in appendix B of this section.
        (l) Identification marker and length marker. (1) Each length of wire must be permanently identified as to manufacturer and year of manufacture.
        (2) The number of conductor pairs and their gauge size must be marked on the jacket.
        (3) The marking must be printed on the jacket at regular intervals of not more than 1.5 m (5 ft).
        (4) An alternative method of marking may be used if accepted by RUS prior to its use.
        (5) The completed wire must have sequentially numbered length markers in FEET OR METERS at regular intervals of not more than 1.5 m (5 ft) along the outside of the jacket.
        (6) The method of length marking must be such that for any single length of wire, continuous sequential numbering must be employed.
        (7) The numbers must be dimensioned and spaced to produce good legibility and must be approximately 3 mm (0.125 in.) in height. An occasional illegible marking is permissible if there is a legible marking located not more than 1.5 m (5 ft) from it.
        (8) The method of marking must be by means of suitable surface markings producing a clear, distinguishable, contrasting marking acceptable to RUS. Where direct or transverse printing is employed, the characters should be indented to produce greater durability of marking. Any other method of length marking must be acceptable to RUS as producing a marker suitable for the field. Size, shape and spacing of numbers, durability, and overall legibility of the marker will be considered in acceptance of the method.
        (9) The accuracy of the length marking must be such that the actual length of any wire section is never less than the length indicated by the marking and never more than one percent greater than the length indicated by the marking.
        (10) The color of the initial marking must be white or silver. If the initial marking fails to meet the requirements of the preceding paragraphs, it will be permissible to either remove the defective marking and re-mark with the white or silver color or leave the defective marking on the wire and re-mark with yellow. No further re-marking is permitted. Any re-marking must be on a different portion of the wire circumference than any existing marking when possible and have a numbering sequence differing from any other existing marking by at least 5,000.
        (11) Any reel of wire which contains more than one set of sequential markings must be labeled to indicate the color and sequence of marking to be used. The labeling must be applied to the reel and also to the wire.
        (m) Electrical requirements -- (1) Mutual capacitance and conductance. (i) The average mutual capacitance (corrected for length) of all pairs in any reel must not exceed 52 1B 4 nanofarad/ kilometer (nF/km) (83 1B 7 nanofarad/mile (nF/mile)) when tested in accordance with ASTM D 4566 - 90 at a frequency of 1.0 1B 0.1 kilohertz (kHz) and a temperature of 23 1B 3C.
        (ii) The mutual conductance (corrected for length and gauge) of any pair must not exceed 2 micromhos/kilometer (micromhos/km) (3.3 micromhos/mile) when tested in accordance with ASTM D 4566 - 90 at a frequency of 1.0 1B 0.1 kHz and a temperature of 23 1B 3C.
        (2) Pair-to-pair capacitance unbalance. The capacitance unbalance between any pair of the completed wire must not exceed 145 picofarad/kilometer (pF/km) (80 picofarad/1000 ft (pF/1000 ft)) when tested in accordance with ASTM D 4566 - 90 at a frequency of 1.0 1B 0.1 kHz and a temperature of 23 1B 3C.
        (3) Pair-to-ground capacitance unbalance -- (i) Pair-to-ground. The capacitance unbalance as measured on the individual pairs of the completed wire must not exceed 2625 pF/km (800 pF/1000 ft) when tested in accordance with ASTM D 4566 - 90 at a frequency of 1.0 1B 0.1 kHz and a temperature of 23 1B 3C.
        (ii) When measuring pair-to-ground capacitance unbalance, all pairs, except the pair under test, are grounded to the shield.
        (iii) Pair-to-ground capacitance unbalance may vary directly with the length of the wire.
        (4) Far-end crosstalk loss. (i) The output-to-outputfar-end crosstalk loss (FEXT) between any pair combination of a completed wire when measured in accordance with ASTM D 4566 - 90 at a test frequency of 150 kHz must not be less than 58 decibel/ kilometer (dB/km) (63 decibel/1000 ft). If the loss Ko at a frequency Fo for length Lo is known, then Kx can be determined for any other frequency Fx or length Lx by:
E:\PICKUP\er19no93.004
        (5) Attenuation. The attenuation of any individual pair on any reel of wire must not exceed the following limits when measured at or corrected to a temperature of 20 1B 1C and a test frequency of
(TABLE START)150 kHz. The test must be conducted in accordance with ASTM D 4566 - 90.
@h1Conductor AWG
@h1Individual Pair Attenuation dB/km (decibel/mile (dB/mile))@h2Maximum@h2Minimum
        22  .... 6.8 (11.0)  .... 5.0 (8.1)
        24  .... 8.7 (14.0)  .... 6.6 (10.7)
(TABLE END)
        (6) Insulation resistance. Each insulated conductor in each length of completed wire, when measured with all other insulated conductors and the shield grounded, must have an insulation resistance of not less than 1600 megohm-kilometer (1000 megohm-mile) at 20 1B 1C. The measurement must be made in accordance with the procedures of ASTM D 4566 - 90.
        (7) High voltage test. (i) In each length of completed wire, the insulation between conductors when tested in accordance with ASTM D 4566 - 90 must withstand for 3 seconds a direct current (dc) potential whose value is not less than:
        (A) 5.0 kilovolts for 22-gauge conductors; and
        (B) 4.0 kilovolts for 24-gauge conductors.
        (ii) In each length of completed wire, the dielectric strength between the shield and all conductors in the core must be tested in accordance with ASTM D 4566 - 90 and must withstand, for 3 seconds, a dc potential whose value is not less than 20 kilovolts.
        (8) Conductor resistance. The dc resistance of any conductor must be measured in the completed wire in accordance with ASTM D 4566 - 90 and must not exceed the following values when measured at or corrected to a
(TABLE START)temperature of 20 1B 1C.
@h1AWG
@h1Maximum Resistance@h2ohms/kilometer@h2(ohms/1000 ft)
        22  .... 57.1  .... (17.4)
        24  .... 90.2  .... (27.5)
(TABLE END)
        (9) Resistance unbalance. (i) The difference in dc resistance between the two conductors of any pair in the completed wire must not exceed 5.0 percent when measured in accordance with the procedures of ASTM D 4566 - 90.
        (ii) The resistance unbalance between tip and ring conductors shall be random with respect to the direction of unbalance. That is, the resistance of the tip conductors shall not be consistently higher with respect to the ring conductors and vice versa.
        (n) Mechanical requirements -- (1) Defective wire. Pairs in each length of wire will not be permitted to have either a ground, cross, short or open circuit condition.
        (2) Wire breaking strength. The breaking strength of the completed wire must not be less than 890 newtons (200 pound-force) when tested in accordance with ASTM D 4565 - 90a using a jaw separation speed of 25 mm/min (1.0 in./min).
        (3) Wire bending test. The completed wire must be capable of meeting the requirements of ASTM D 4565 - 90a after conditioning at 20 1B 2C and at 23 1B 2C.
        (4) Water penetration test. (i) A one meter (3 ft) length of completed wire must be stabilized at 23 1B 2C and tested in accordance with ASTM D 4565 - 90a using a one meter (3 ft) water head over the sample or placed under the equivalent continuous pressure for one hour.
        (ii) After the one hour period, there must be no water leakage in the sheath interfaces, under the core wrap or between any insulated conductors in the core.
        (iii) If water leakage is detected in the first sample, one 3 m (10 ft) additional adjacent sample from the same reel of wire must be tested in accordance with paragraph (n)(4)(ii) of this section. If the second sample exhibits water leakage, the entire reel of wire is to be rejected. If the second sample exhibits no leakage, the entire reel of wire is considered acceptable.
        (5) Compound flow test. The completed wire must be capable of meeting the compound flow test specified in ASTM D 4565 - 90a when exposed for a period of 24 hours at a temperature of 80 1B 1C. At the end of this test period, there must be no evidence of flowing or dripping of compound from either the core or sheath interfaces.
        (o) Acceptance testing and extent of testing. (1) The tests described in appendix A of this section are intended for acceptance of wire designs and major modifications of accepted designs. RUS decides what constitutes a major modification. These tests are intended to show the inherent capability of the manufacturer to produce wire products having long life and stability.
        (2) For initial acceptance, the manufacturer must submit:
        (i) An original signature certification that the product fully complies with each requirement of this section;
        (ii) Qualification Test Data, per appendix A of this section;
        (iii) To periodic plant inspections;
        (iv) A certification that the product does or does not comply with the domestic origin manufacturing provisions of the ``Buy American'' requirements of the Rural Electrification Act of 1938 (7 U.S.C. 901 et seq.);
        (v) Written user testimonials concerning performance of the product; and
        (vi) Other nonproprietary data deemed necessary by the Chief, Outside Plant Branch (Telephone).
        (3) For requalification acceptance, the manufacturer must submit an original signature certification that the product fully complies with each section of the specification, excluding the Qualification Section, and a certification that the product does or does not comply with the domestic origin manufacturing provisions of the ``Buy American'' requirements of the Rural Electrification Act of 1938 (7 U.S.C. 901 et seq.) for acceptance by June 30 every three years. The required data and certification must have been gathered within 90 days of the submission.
        (4) Initial and requalification acceptance requests should be addressed to: Chairman, Technical Standards, Committee ``A'' (Telephone), Telecommunications Standards Division, Rural Utilities Service, Washington, DC 20250 - 1500.
        (5) Tests on 100 percent of completed wire. (i) The shield of each length of wire must be tested for continuity using the procedures of ASTM D 4566 - 90.
        (ii) Dielectric strength between all conductors and the shield must be tested to determine freedom from grounds in accordance with paragraph (m)(7)(ii) of this section.
        (iii) Each conductor in the completed wire must be tested for continuity using the procedures of ASTM D 4566 - 90.
        (iv) Dielectric strength between conductors must be tested to ensure freedom from shorts and crosses in accordance with paragraph (m)(7)(i) of this section.
        (v) The average mutual capacitance must be measured on all wires.
        (6) Capability tests. Tests on a quality assurance basis must be made as frequently as is required for each manufacturer to determine and maintain compliance with:
        (i) Performance requirements for conductor insulation and jacket material;
        (ii) Performance requirements for filling and flooding compounds;
        (iii) Sequential marking and lettering;
        (iv) Capacitance unbalance and crosstalk;
        (v) Insulation resistance;
        (vi) Conductor resistance and resistance unbalance;
        (vii) Wire bending and wire breaking strength tests;
        (viii) Mutual conductance and attenuation; and
        (ix) Water penetration and compound flow tests.
        (p) Summary of records of electrical and physical tests. (1) Each manufacturer must maintain suitable summary of records for a period of at least 3 years for all electrical and physical tests required on completed wire by this section as set forth in paragraphs (o)(5) and (o)(6) of this section. The test data for a particular reel shall be in a form that it may be readily available to the purchaser or to RUS upon request.
        (2) Measurements and computed values must be rounded off to the number of places of figures specified for the requirement according to ASTM E 29 - 90.
        (q) Manufacturing irregularities. (1) Repairs to the inner jacket and shield are not permitted in wire supplied to the end user under this section.
        (2) Minor defects in the outer jackets (defects having a dimension of 3 mm (0.125 in.) or less in any direction) may be repaired by means of heat fusing in accordance with good commercial practices utilizing sheath grade compound.
        (r) Preparation for shipment. (1) The wire must be shipped on reels. The diameter of the drum must be large enough to prevent damage to the wire from reeling or unreeling. The reels must be substantial and so constructed as to prevent damage to the wire during shipment and handling.
        (2) The thermal wrap must comply with the requirements of appendix C of this section. When a thermal reel wrap is supplied, the wrap must be applied to the reel and must be suitably secured in place to minimize thermal exposure to the wire during storage and shipment. The use of the thermal reel wrap as a means of reel protection will be at the option of the manufacturer unless specified by the end user.
        (3) The outer end of the wire must be securely fastened to the reel head so as to prevent the wire from becoming loose in transit. The inner end of the wire must be securely fastened in such a way as to make it readily available if required for electrical testing. Spikes, staples, or other fastening devices which penetrate the wire jacket must not be used. The method of fastening the wire ends must be accepted by RUS prior to it being used.
        (4) Each length of wire must be wound on a separate reel unless otherwise specified or agreed to by the purchaser.
        (5) Each reel must be plainly marked to indicate the direction in which it should be rolled to prevent loosening of the wire on the reel.
        (6) Each reel must be stenciled or labeled on either one or both sides with the name of the manufacturer, year of manufacture, actual shipping length, an inner and outer end sequential length marking, description of the wire, reel number and the RUS wire designation:
Wire Designation
BFW
Wire Construction
Pair Count
Conductor Gauge
N = Copper Alloy 220 (Bronze) Shield
Y = Gopher Resistant Shields
Example: BFWY 3 - 24
Buried Filled Wire, Gopher Resistant Shield, 3 pair, 24 AWG
        (7) Both ends of the filled buried wire, manufactured to the requirements of this section, must be equipped with end caps which are acceptable to RUS.
(The information and recordkeeping requirements of this section have been approved by the Office of Management and Budget (OMB) under the control number 0572 - 0059)
Appendix A to 7 CFR 1755.860 -- Qualification Test Methods
        (I) The test procedures described in this appendix are for qualification of initial designs and major modifications of accepted designs. Included in (V) of this appendix are suggested formats that may be used in submitting test results to RUS.
        (II) Sample Selection and Preparation. (1) All testing must be performed on lengths removed sequentially from the same 3 pair, 22 gauge jacketed wire. This wire must not have been exposed to temperatures in excess of 38C since its initial cool down after sheathing. The lengths specified are minimum lengths and if desirable from a laboratory testing standpoint longer lengths may be used.
        (a) Length A shall be 10 1B 0.2 meters (33 1B 0.5 feet) long and must be maintained at 23 1B 3C. One length is required.
        (b) Length B shall be 12 1B 0.2 meters (40 1B 0.5 feet) long. Prepare the test sample by removing the inner and outer jacket, shield, and core wrap, if present, for a sufficient distance on both ends to allow the insulated conductors to be flared out. Remove sufficient conductor insulation so that appropriate electrical test connections can be made at both ends. Coil the specimen with a diameter of 15 to 20 times its sheath diameter. Three lengths are required.
        (c) Length C shall be one meter (3 feet) long. Four lengths are required.
        (d) Length D shall be 300 millimeters (1 foot) long. Four lengths are required.
        (e) Length E shall be 600 millimeters (2 feet) long. Four lengths are required.
        (f) Length F shall be 3 meters (10 feet) long and must be maintained at 23 1B 3C for the duration of the test. Two lengths are required.
        (2) Data Reference Temperature. Unless otherwise specified, all measurements shall be made at 23 1B 3C.
        (III) Environmental Tests -- (1) Heat Aging Test -- (a) Test Samples. Place one sample each of lengths B, C, D, and E in an oven or environmental chamber. The ends of sample B must exit from the chamber or oven for electrical tests. Securely seal the oven exit holes.
        (b) Sequence of Tests. After conditioning the samples are to be subjected to the following tests:
        (i) Water Immersion Test outlined in (III)(2) of this appendix;
        (ii) Water Penetration Test outlined in (III)(3) of this appendix; .
        (iii) Insulation Compression Test outlined in (III)(4) of this appendix; and
        (iv) Jacket Slip Strength Test outlined in (III)(5) of this appendix.
        (c) Initial Measurements. (i) For sample B, measure the open circuit capacitance and conductance for each pair at 1 and 150 kilohertz and the attenuation at 150 kilohertz after conditioning the sample at the data reference temperature for 24 hours. Calculate the average and standard deviation for the data of the 3 pairs on a per kilometer (per mile) basis.
        (ii) The attenuation at 150 kilohertz may be calculated from open circuit admittance (Yoc) and short circuit impedance (Zsc) or may be obtained by direct measurement of attenuation.
        (iii) Record on suggested formats attached in (V) of this appendix or on other easily readable formats.
        (d) Heat Conditioning. (i) Immediately after completing the initial measurements, condition the sample for 14 days at a temperature of 65 1B 2C.
        (ii) At the end of this period note any exudation of filling compound. Measure and calculate the parameters given in (III)(1)(c) of this appendix. Record on suggested formats attached in (V) of this appendix or on other easily readable formats.
        (iii) Cut away and discard a one meter (3 foot) section from each end of length B.
        (e) Overall Electrical Deviation. (i) Calculate the percent change in all average parameters between the final parameters after conditioning with the initial parameters in (III)(1)(c) of this appendix.
        (ii) The stability of the electrical parameters after completion of this test must be within the following prescribed limits:
        (A) Capacitance. The average mutual capacitance must be within 5 percent of its original value;
        (B) The change in average mutual capacitance must be less than 5 percent over the frequency range of 1 to 150 kilohertz;
        (C) Conductance. The average mutual conductance must not exceed 2 micromhos/kilometer (3.3 micromhos/mile) at a frequency of 1 kilohertz; and
        (D) Attenuation. The attenuation must not have increased by more than 5 percent over its original value.
        (2) Water Immersion Electrical Test -- (a) Test Sample Selection. The 10 meter (33 foot) section of length B must be tested.
        (b) Test Sample Preparation. Prepare the sample by removing the inner and outer jacket, shield, and core wrap, if present, for a sufficient distance to allow one end to be accessed for test connections. Cut out a series of 2.5 millimeter by 13 millimeter (0.1 inch by 0.5 inch) rectangular slots along the test sample, at 300 millimeter (1 foot) intervals progressing successively 90 degrees around the circumference of the wire. Assure that the wire core is exposed at each slot by slitting the inner jacket and core wrap if present. Place the prepared sample in a dry vessel which when filled will maintain a one meter (3 foot) head of water over 6 meters (20 feet) of uncoiled wire. Extend and fasten the ends of the wire so they will be above the water line and the pairs are rigidly held for the duration of the test.
        (c) Capacitance and Conductance Testing. Measure the initial values of mutual capacitance and conductance of all pairs in each wire at a frequency of 1 kilohertz before filling the vessel with water. Be sure the wire shield is grounded to the test equipment. Fill the vessel until there is a one meter (3 foot) head of water on the wires.
        (i) Remeasure the mutual capacitance and conductance after the wires have been submerged for 24 hours and again after 30 days.
        (ii) Record each sample separately on the suggested formats attached in (V) of this appendix or on other easily readable formats.
        (d) Overall Electrical Deviation. (i) Calculate the percent change in all average parameters between the final parameters after conditioning with the initial parameters in (III)(2)(c) of this appendix.
        (ii) The stability of the electrical parameters after of the test must be within the following prescribed limits:
        (A) Capacitance. The average mutual capacitance must be within 5 percent of its original value; and
        (B) Conductance. The average mutual conductance must not exceed 2 micromhos/kilometer (3.3 micromhos/mile) at a frequency of 1 kilohertz.
        (3) Water Penetration Testing. (a) A watertight closure must be placed over the jacket of length C. The closure must not be placed over the jacket so tightly that the flow of water through preexisting voids or air spaces is restricted. The other end of the sample must remain open.
        (b) Test per Option A or Option B. (i) Option A. Weigh the sample and closure prior to testing. Fill the closure with water and place under a continuous pressure of 10 1B 0.7 kilopascals (1.5 1B 0.1 pounds per square inch gauge) for one hour. Collect the water leakage from the end of the test sample during the test and weigh to the nearest 0.1 gram. Immediately after the one hour test, seal the ends of the wire with a thin layer of grease and remove all visible water from the closure, being careful not to remove water that penetrated into the core during the test. Reweigh the sample and determine the weight of water that penetrated into the core. The weight of water that penetrated into the core must not exceed 1 gram.
        (ii) Option B. Fill the closure with a 0.2 gram sodium fluorscein per liter water solution and apply a continuous pressure of 10 1B 0.7 kilopascals (1.5 1B 0.1 pounds per square inch gauge) for one hour. Catch and weigh any water that leaks from the end of the wire during the one hour period. If no water leaks from the sample, carefully remove the water from the closure. Then carefully remove the outer jacket, shield, inner jacket and core wrap, if present, one at a time, examining with an ultraviolet light source for water penetration. After removal of the inner jacket and core wrap, if present, carefully dissect the core and examine for water penetration within the core. Where water penetration is observed, measure the penetration distance. The distance of water penetration into the core must not exceed 127 millimeters (5.0 inches).
        (4) Insulation Compression Test. (a) Test Sample D. Remove inner and outer jacket, shield, and core wrap, if present, being careful not to damage the conductor insulation. Remove one pair from the core and carefully separate, wipe off core filler and straighten the insulated conductors. Retwist the two insulated conductors together under sufficient tension to form 10 evenly spaced 360 degree twists in a length of 100 millimeters (4 inches).
        (b) Sample Testing. Center the mid 50 millimeters (2 inches) of the twisted pair between two smooth rigid parallel metal plates measuring 50 millimeters (2 inches) in length or diameter. Apply a 1.5 volt direct current potential between the conductors, using a light or buzzer to indicate electrical contact between the conductors. Apply a constant load of 67 newtons (15 pound-force) on the sample for one minute and monitor for evidence of contact between the conductors. Record results on suggested formats attached in (V) of this appendix or on other easily readable formats.
        (5) Jacket Slip Strength Test -- (a) Sample Selection. Test sample E from (III)(1)(a) of this appendix.
        (b) Sample Preparation. Prepare test sample in accordance with the procedures specified in ASTM D 4565 - 90a.
        (c) Sample Conditioning and Testing. Remove the sample from the tensile tester prior to testing and condition for one hour at 50 1B 2C. Test immediately in accordance with the procedure specified in ASTM D 4565 - 90a. A minimum outer jacket slip strength of 67 newtons (15 pound-force) is required. Record the load attained.
        (6) Humidity Exposure. (a) Repeat steps (III)(1)(a) through (III)(1)(c)(iii) of this appendix for separate set of samples B, C, D and E which have not been subjected to prior environmental conditioning.
        (b) Immediately after completing the measurements, expose the test sample to 100 temperature cyclings. Relative humidity within the chamber must be maintained at 90 1B 2 percent. One cycle consists of beginning at a stabilized chamber and test sample temperature of 52 1B 1C, increasing the temperature to 57 1B 1C, allowing the chamber and test samples to stabilize at this level, then dropping the temperature back to 52 1B 1C.
        (c) Repeat steps (III)(1)(d)(ii) through (III)(5)(c) of this appendix.
        (7) Temperature Cycling. (a) Repeat steps (III)(1)(a) through (III)(1)(c)(iii) of this appendix for separate set of samples B, C, D and E which have not been subjected to prior environmental conditioning.
        (b) Immediately after completing the measurements, subject the test sample to 10 cycles of temperature between 40C and +60C. The test sample must be held at each temperature extreme for a minimum of 1 1/2 hours during each cycle of temperature. The air within the temperature cycling chamber must be circulated throughout the duration of the cycling.
        (c) Repeat steps (III)(1)(d)(ii) through (III)(5)(c) of this appendix.
        (IV) Control Sample -- (1) Test Samples. A separate set of lengths for samples A, C, D, and E must have been maintained at 23 1B 3C for at least 48 hours before the testing.
        (2) Repeat steps (III)(2) through (III)(5)(c) of this appendix except use length A instead of length B.
        (3) Surge Test. (a) One length of sample F must be used to measure the breakdown between conductors while the other length of F must be used to measure core to shield breakdown.
        (b) The samples must be capable of withstanding, without damage, a single surge voltage of 20 kilovolts peak between conductors, and 35 kilovolts peak between conductors and the shield as hereinafter described. The surge voltage must be developed from a capacitor discharge through a forming resistor connected in parallel with the dielectric of the test sample. The surge generator constants must be such as to produce a surge of 1.5 0A 40 microseconds wave shape.
        (c) The shape of the generated wave must be determined at a reduced voltage by connecting an oscilloscope across the forming resistor with the wire sample connected in parallel with the forming resistor. The capacitor bank is charged to the test voltage and then discharged through the forming resistor and test sample. The test sample will be considered to have passed the test if there is no distinct change in the wave shape obtained with the initial reduced voltage compared to that obtained after the application of the test voltage.
        (V) The following suggested formats may be used in submitting the
(TABLE START)test results to RUS:
Environmental Conditioning XXXXXXX
FREQUENCY 1 kilohertz
@h1PAIR NUMBER
@h1CAPACITANCE @h2nF/km@h3Initial@h2(nF/mile)@h3Final
@h1CONDUCTANCE@h2micromhos/km@h3Initial@h2(micromhos/mile)@h3Final
        1 .... XXXX .... XXXX .... XXXX .... XXXX
        2 .... XXXX .... XXXX .... XXXX .... XXXX
        3 .... XXXX .... XXXX .... XXXX .... XXXX
        Average xAE8 .... XXXX .... XXXX .... XXXX .... XXXX
Footnote: Overall Percent Difference in Average xAE8     Capacitance:XXXXXXXXXXXXXX
(TABLE START)Conductance: XXXXXXXXXXXXXX
(TABLE END)
Environmental Conditioning XXXXXXXXXXXX
FREQUENCY 150 kilohertz
@h1PAIR NUMBER
@h1CAPACITANCE@h2nF/km@h3Initial@h2(nF/mile)@h3Final
@h1CONDUCTANCE@h2micromhos/km@h3Initial@h2(micromhos/mile)@h3Final
@h1ATTENUATION@h2dB/km@h3Initial@h2(dB/mile)@h3Final
        1 .... XXX .... XXX .... XXX .... XXX .... XXX .... XXX
        2 .... XXX .... XXX .... XXX .... XXX .... XXX .... XXX
        3 .... XXX .... XXX .... XXX .... XXX .... XXX .... XXX
        Average xAE8 .... XXX .... XXX .... XXX .... XXX .... XXX .... XXX
Footnote: Overall Percent Difference in Average xAE8    Capacitance:XXXXXXXXXXX   Conductance: XXXXXXXXXXX
(TABLE START)Attenuation:XXXXXXXXXXX
(TABLE END)
Environmental Conditioning XXXXXXXXXXXXXXX
WATER IMMERSION TEST (1 kilohertz)
@h1PAIR NUMBER
@h1CAPACITANCE @h2nF/km@h3Initial@h2(nF/mile)@h324 hours@h3Final
@h1CONDUCTANCE@h2micromhos/km@h3Initial@h2(micromhos/mile)@h324 hours@h3Final
        1 .... XXX .... XXX .... XXX .... XXX .... XXX .... XXX
        2 .... XXX .... XXX .... XXX .... XXX .... XXX .... XXX
        3 .... XXX .... XXX .... XXX .... XXX .... XXX .... XXX
        Average xAE8 .... XXX .... XXX .... XXX .... XXX .... XXX .... XXX
Footnote: Overall Percent Difference in Average xAE8
(TABLE START)Capacitance:XXXXXXXXXXXXXX     Conductance: XXXXXXXXXXXXXX
(TABLE END)
Water Penetration Test
@h1
@h1Option A@h2End Leakage grams@h2Weight Gain grams
@h1Option B@h2End Leakage grams@h2Penetration mm (in.)
Control .... XXXXX .... XXXXX .... XXXXX .... XXXXX
Heat Age .... XXXXX .... XXXXX .... XXXXX .... XXXXX
Humidity Exposure .... XXXXX .... XXXXX .... XXXXX .... XXXXX
Temperature
(TABLE START)Cycling .... XXXXX .... XXXXX .... XXXXX .... XXXXX
(TABLE END)
Insulation Compression
@h1
@h1Failures
Control .... XXXXXXXX
Heat Age .... XXXXXXXX
Humidity Exposure .... XXXXXXXX
(TABLE START)
Temperature Cycling .... XXXXXXXX
(TABLE END)
Jacket Slip Strength @ 50C
@h1
@h1Load in newtons (pound-force)
Control .... XXXXXXXX
Heat Age .... XXXXXXXX
Humidity Exposure .... XXXXXXXX
(TABLE START)
Temperature Cycling .... XXXXXXXX
(TABLE END)
Filler Exudation (grams)
@h1
@h1
Heat Age .... XXXXXXXX
Humidity Exposure .... XXXXXXXX
(TABLE START)
Temperature Cycle .... XXXXXXXX
(TABLE END)
Surge Test (kilovolts)
@h1
@h1
Conductor to Conductor .... XXXXXXXX
Shield to Conductors .... XXXXXXXX
(TABLE END)
Appendix B to 7 CFR 1755.860 -- Sheath Slitting Cord Qualification
        (I) The test procedures described in this appendix are for qualification of initial and subsequent changes in sheath slitting cords.
        (II) Sample Selection. All testing must be performed on two 1.2 meters (4 feet) lengths of wire removed sequentially from the same 3 pair, 22 gauge jacketed wire. This wire must not have been exposed to temperatures in excess of 38C since its initial cool down after sheathing.
        (III) Test Procedure. (1) Using a suitable tool, expose enough of sheath slitting cord to permit grasping with needle nose pliers.
        (2) The prepared test specimens must be maintained at a temperature of 23 1B 1C for at least 4 hours immediately prior to and during the test.
        (3) Wrap the sheath slitting cord around the plier jaws to ensure a good grip.
        (4) Grasp and hold the wire in a convenient position while gently and firmly pulling the sheath slitting cord longitudinally in the direction away from the wire end. The angle of pull may vary to any convenient and functional degree. A small starting notch is permissible.
        (5) The sheath slitting cord is considered acceptable if the cord can slit the jacket and/or shield for a continuous length of 0.6 meter (2 feet) without breaking the cord.
Appendix C to 7 CFR 1755.860 -- Thermal Reel Wrap Qualification
        (I) The test procedures described in this appendix are for qualification of initial and subsequent changes in thermal reel wraps.
        (II) Sample Selection. All testing must be performed on two 450 millimeter (18 inch) lengths of wire removed sequentially from the same 3 pair, 22 gauge jacketed wire. This wire must not have been exposed to temperatures in excess of 38C since its initial cool down after sheathing.
        (III) Test Procedure. (1) Place the two samples on an insulating material such as wood, etc.
        (2) Tape thermocouples to the jackets of each sample to measure the jacket temperature.
        (3) Cover one sample with the thermal reel wrap.
        (4) Expose the samples to a radiant heat source capable of heating the uncovered jacket sample to a minimum of 71C. A 600 watt photoflood lamp or an equivalent lamp having the light spectrum approximately that of the sun shall be used.
        (5) The height of the lamp above the jacket shall be 380 millimeters (15 inches) or a height that produces the 71C jacket temperature on the unwrapped sample.
        (6) After the samples have stabilized at the temperature, the jacket temperatures of the samples must be recorded after one hour of exposure to the heat source.
        (7) Compute the temperature difference between the jackets.
        (8) For the thermal reel wrap to be acceptable to RUS, the temperature differences between the jacket with the thermal reel wrap and the jacket without the reel wrap must be greater than or equal to 17C.
[58 FR 61004, Nov. 19, 1993, as amended at 60 FR 1711, Jan. 5, 1995]
_1755.870   RUS specification for terminating cables.
        (a) Scope. (1) This section establishes the requirements for terminating cables used to connect incoming outside plant cables to the vertical side of the main distributing frame in a telephone central office.
        (i) The conductors are solid tinned copper, individually insulated with extruded solid dual insulating compounds.
        (ii) The insulated conductors are twisted into pairs which are then stranded or oscillated to form a cylindrical core.
        (iii) The cable structure is completed by the application of a core wrap, a shield, and a polyvinyl chloride jacket.
        (2) The number of pairs and gauge size of conductors which are
(TABLE START)used within the RUS program are provided in the following table:
@h1American Wire Gauge (AWG)
@h122
@h124
Number of Pairs  .... 12  .... 12
  .... 50  .... 50
  .... 100  .... 100
  .... 200  .... 200
  .... 300  .... 300
  .... 400  .... 400
  .... 600  .... 600
  .... 800  .... 800
Footnote: Note: Cables larger in pair sizes from those shown in this table shall meet all the requirements of this section.
(TABLE END)
        (3) All cables sold to RUS borrowers for projects involving RUS loan funds under this section must be accepted by RUS Technical Standards Committee ``A'' (Telephone). For cables manufactured to the specification of this section, all design changes to an accepted design must be submitted for acceptance. RUS will be the sole authority on what constitutes a design change.
        (4) Materials, manufacturing techniques, or cable designs not specifically addressed by this section may be allowed if accepted by RUS. Justification for acceptance of modified materials, manufacturing techniques, or cable designs shall be provided to substantiate product utility and long term stability and endurance.
        (5) The American National Standard Institute/Electronic Industries Association (ANSI/EIA) 359 - A - 84, EIA Standard Colors for Color Identification and Coding, referenced in this section is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of ANSI/EIA 359 - A - 84 are available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from Global Engineering Documents, 15 Inverness Way East, Englewood, CO 80112, telephone number (303) 792 - 2181.
        (6) American Society for Testing and Materials Specifications (ASTM) B 33 - 91, Standard Specification for Tinned Soft or Annealed Copper Wire for Electrical Purposes; ASTM B 736 - 92a Standard Specification for Aluminum, Aluminum Alloy and Aluminum-Clad Steel Cable Shielding Stock; ASTM D 1248 - 84 (1989), Standard Specification for Polyethylene Plastics Molding and Extrusion Materials; ASTM D 1535 - 89, Standard Test Method for Specifying Color by the Munsell System; ASTM D 2287 - 81 (Reapproved 1988), Standard Specification for Nonrigid Vinyl Chloride Polymer and Copolymer Molding and Extrusion Compounds; ASTM D 2436 - 85, Standard Specification for Forced-Convection Laboratory Ovens for Electrical Insulation; ASTM D 2633 - 82 (Reapproved 1989), Standard Methods of Testing Thermoplastic Insulations and Jackets for Wire and Cable; ASTM D 4101 - 82 (1988), Standard Specification for Propylene Plastic Injection and Extrusion Materials; ASTM D 4565 - 90a, Standard Test Methods for Physical and Environmental Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable; ASTM D 4566 - 90, Standard Test Methods for Electrical Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable; and ASTM E 29 - 90, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications, referenced in this section are incorporated by reference by RUS. These incorporations by references were approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of the ASTM standards are available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from ASTM, 1916 Race Street, Philadelphia, Pennsylvania 19103 - 1187, telephone number (215) 299 - 5585.
        (7) American National Standards Institute/National Fire Protection Association (ANSI/NFPA), NFPA 70 - 1993 National Electrical Code referenced in this section is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. A copy of the ANSI/NFPA standard is available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from NFPA, Batterymarch Park, Quincy, Massachusetts 02269, telephone number 1 (800) 344 - 3555.
        (8) Underwriters Laboratories Inc. (UL) 1666, Standard Test for Flame Propagation Height of Electrical and Optical-Fiber Cables Installed Vertically in Shafts, dated January 22, 1991, referenced in this section is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. A copy of the UL standard is available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from UL Inc., 333 Pfingsten Road, Northbrook, Illinois 60062 - 2096, telephone number (708) 272 - 8800.
        (b) Conductors and conductor insulation. (1) Each conductor shall be a solid round wire of commercially pure annealed tin coated copper. Conductors shall meet the requirements of the American Society for Testing and Materials (ASTM) B 33 - 91 except that requirements for Dimensions and Permissible Variations are waived.
        (2) Joints made in conductors during the manufacturing process may be brazed, using a silver alloy solder and nonacid flux, or they may be welded using either an electrical or cold welding technique. In joints made in uninsulated conductors, the two conductor ends shall be butted. Splices made in insulated conductors need not be butted but may be joined in a manner acceptable to RUS.
        (3) The tensile strength of any section of a conductor, containing a factory joint, shall not be less than 85 percent of the tensile strength of an adjacent section of the solid conductor of equal length without a joint.
        (4) Engineering Information: The sizes of wire used and their
(TABLE START)nominal diameters shall be as shown in the following table:
@h1AWG
@h1Nominal diameter @h2Millimeters @h2(Inches)
22  .... 0.643  .... (0.0253)
24  .... 0.511  .... (0.0201)
(TABLE END)
        (5) Each conductor shall be insulated with a primary layer of natural or white solid, insulating grade, high density polyethylene or crystalline propylene/ethylene copolymer and an outer skin of colored, solid, insulating grade, polyvinyl chloride (PVC) using one of the insulating materials listed in paragraphs (b)(5)(i) through (iii) of this section.
        (i) The polyethylene raw material selected to meet the requirements of this section shall be Type III, Class A, Category 4 or 5, Grade E9, in accordance with ASTM D 1248 - 84 (1989).
        (ii) The crystalline propylene/ethylene raw material selected to meet the requirements of this section shall be Class PP 200B 40003 E11 in accordance with ASTM D 4101 - 82 (1988).
        (iii) The PVC raw material selected to meet the requirements of this section shall be either Type PVC - 64751E3XO, Type PVC - 76751E3XO, or Type PVC - 77751E3XO in accordance with ASTM D 2287 - 81 (1988).
        (iv) Raw materials intended as conductor insulation furnished to these requirements shall be free from dirt, metallic particles, and other foreign matter.
        (v) All insulating raw materials shall be accepted by RUS prior to their use.
        (6) All conductors in any single length of cable shall be insulated with the same type of material.
        (7) A permissible overall performance level of faults in conductor insulation when using the test procedures in paragraph (b)(8) of this section shall average not greater than one fault per 12,000 conductor meters (40,000 conductor feet) for each gauge of conductor.
        (8) The test used to determine compliance with paragraph (b)(7) of this section shall be conducted as follows:
        (i) Samples tested shall be taken from finished cables selected at random from standard production cable. The samples tested shall contain a minimum of 300 conductor meters (1,000 conductor feet) for cables sizes less than 50 pairs and 1,500 conductor meters (5,000 conductor feet) for cables sizes greater than or equal to 50 pairs. No further sample need be taken from the same cable production run within 6,000 cable meters (20,000 cable feet) of the original test sample from that run.
        (ii) The cable sample shall have its jacket, shield, and core wrap removed and its core shall be immersed in tap water for a minimum period of 6 hours. In lieu of removing the jacket, shield, and core wrap from the core, the entire cable may be tested. In this case, the core shall be completely filled with tap water, under pressure; then the cable assembly shall be immersed for a minimum period of 6 hours. With the cable core still fully immersed, except for end connections, the insulation resistance (IR) of all conductors to water shall be measured using a direct current (dc) voltage of 100 volts to 550 volts.
        (iii) An IR value of less than 500 megohms for any individual insulated conductor tested at or corrected to a temperature of 23 _C is considered a failure. If the cable sample is more than 7.5 meters (25 feet) long, all failing conductors shall be retested and reported in 7.5 meter (25 foot) segments.
        (iv) The pair count, gauge, footage, and number of insulation faults shall be recorded. This information shall be retained on a 6 month running basis for review by RUS when requested.
        (v) A fault rate, in a continuous length in any one reel, in excess of one fault per 3,000 conductor meters (10,000 conductor feet) due to manufacturing defects is cause for rejection. A minimum of 6,000 conductor meters (20,000 conductor feet) is required to develop a noncompliance in a reel.
        (9) Repairs to the conductor insulation during manufacturing are permissible. The method of repair shall be accepted by RUS prior to its use. The repaired insulation shall be capable of meeting the relevant electrical requirements of this section.
        (10) All repaired sections of insulation shall be retested in the same manner as originally tested for compliance with paragraph (b)(7) of this section.
        (11) The colored composite insulating material removed from or tested on the conductor, from a finished cable, shall be capable of meeting
(TABLE START)the following performance requirements:
@h1Property
@h1Composite insulation
Tensile Strength, Minimum Megapascals (MPa) (Pounds per square inch (psi))  .... 16.5 (2400)
Ultimate Elongation Percent, Minimum  .... 125
Cold Bend Failures, Maximum  .... 0/10
Shrinkback, Maximum Millimeter (mm) (Inches (in.))  .... 9.5 (3/8)
Adhesion, Maximum Newtons (N) (Pound-force (lbf))  .... 13.3 (3)
Compression Minimum, N (lbf)  .... 1780 (400)
(TABLE END)
        (12) Testing procedures. The procedures for testing the composite insulation samples for compliance with paragraph (b)(11) of this section shall be as follows:
        (i) Tensile strength and ultimate elongation. Samples of the insulation material, removed from the conductor, shall be tested in accordance with ASTM D 2633 - 82(1989), except that the speed of jaw separation shall be 50 millimeters/minute (50 mm/min) (2 inches/minute (2 in./min)).
        Note: Quality assurance testing at a jaw separation speed of 500 mm/min (20 in./min) is permissible. Failures at this rate shall be retested at the 50 mm/min (2 in./min) rate to determine specification compliance.
        (ii) Cold bend. Samples of the insulation material on the conductor shall be tested in accordance with ASTM D 4565 - 90a at a temperature of 401B1 _C with a mandrel diameter of 6 mm (0.25 in.). There shall be no cracks visible to normal or corrected-to-normal vision.
        (iii) Shrinkback. Samples of insulation shall be tested for four hours at a temperature of 1151B1 _C in accordance with ASTM D 4565 - 90a.
        (iv) Adhesion. Samples of insulation material on the conductor shall be tested in accordance with ASTM D 4565 - 90a with a crosshead speed of 50 mm/min (2 in./min).
        (v) Compression. Samples of the insulation material on the conductor shall be tested in accordance with ASTM D 4565 - 90a with a crosshead speed of 5 mm/min (0.2 in./min).
        (13) Other methods of testing may be used if acceptable to RUS.
        (c) Identification of pairs and twisting of pairs. (1) The PVC skin shall be colored to identify:
        (i) The tip and ring conductor of each pair; and
        (ii) Each pair in the completed cable.
        (2) The colors used to provide identification of the tip and ring
(TABLE START)conductor of each pair shall be as shown in the following table:
@h1Pair No.
@h1Color@h2Tip@h2Ring
 1  .... White  .... Blue
 2  .... White  .... Orange
 3  .... White  .... Green
 4  .... White  .... Brown
 5  .... White  .... Slate
 6  .... Red  .... Blue
 7  .... Red  .... Orange
 8  .... Red  .... Green
 9  .... Red  .... Brown
10  .... Red  .... Slate
11  .... Black  .... Blue
12  .... Black  .... Orange
13  .... Black  .... Green
14  .... Black  .... Brown
15  .... Black  .... Slate
16  .... Yellow  .... Blue
17  .... Yellow  .... Orange
18  .... Yellow  .... Green
19  .... Yellow  .... Brown
20  .... Yellow  .... Slate
21  .... Violet  .... Blue
22  .... Violet  .... Orange
23  .... Violet  .... Green
24  .... Violet  .... Brown
25  .... Violet  .... Slate
(TABLE END)
        (3) Standards of color. The colors of the insulated conductors supplied in accordance with this section are specified in terms of the Munsell Color System (ASTM D 1535 - 89) and shall comply with the ``Table of Wire and Cable Limit Chips'' as defined in ANSI/EIA - 359 - A - 84. (Visual color standards meeting these requirements may be obtained directly from the Munsell Color Company, Inc., 2441 North Calvert Street, Baltimore, Maryland 21218).
        (4) Positive identification of the tip and ring conductors of each pair by marking each conductor of a pair with the color of its mate is permissible. The method of marking shall be accepted by RUS prior to its use.
        (5) Other methods of providing positive identification of the tip and ring conductors of each pair may be employed if accepted by RUS prior to its use.
        (6) The insulated conductors shall be twisted into pairs.
        (7) In order to provide sufficiently high crosstalk isolation, the pair twists shall be designed to enable the cable to meet the capacitance unbalance and the crosstalk loss requirements of paragraphs (h)(2), (h)(3), and (h)(4) of this section.
        (8) The average length of pair twists in any pair in the finished cable, when measured on any 3 meter (m) (10 foot (ft)) length, shall not exceed 152 mm (6 in.).
        (d) Forming of the cable core. (1) Twisted pairs shall be assembled in such a way as to form a substantially cylindrical group.
        (2) When desired for lay-up reasons, the basic group may be divided into two or more subgroups called units.
        (3) Each group, or unit in a particular group, shall be enclosed in bindings of the colors indicated for its particular pair count. The pair count, indicated by the color of insulation, shall be consecutive as indicated in paragraph (d)(5) of this section through units in a group.
        (4) Threads or tapes used as binders shall be nonhygroscopic and nonwicking. The threads shall consists of a suitable number of ends of each color arranged as color bands. When tapes are used as binders, they shall be colored. Binders shall be applied with a lay of not more than 100 mm (4 in.). The colored binders shall be readily recognizable as the basic intended color and shall be distinguishable from all other colors.
        (5) The colors of the bindings and their significance with respect
(TABLE START)to pair count shall be as shown in the following table:
@h1Group No.
@h1Color of bindings
@h1Group pair count
1  .... White-Blue  .... 1 - 25
2  .... White-Orange  .... 26 - 50
3  .... White-Green  .... 51 - 75
4  .... White-Brown  .... 76 - 100
5  .... White-Slate  .... 101 - 125
6  .... Red-Blue  .... 126 - 150
7  .... Red-Orange  .... 151 - 175
8  .... Red-Green  .... 176 - 200
9  .... Red-Brown  .... 201 - 225
10  .... Red-Slate  .... 226 - 250
11  .... Black-Blue  .... 251 - 275
12  .... Black-Orange  .... 276 - 300
13  .... Black-Green  .... 301 - 325
14  .... Black-Brown  .... 326 - 350
15  .... Black-Slate  .... 351 - 375
16  .... Yellow-Blue  .... 376 - 400
17  .... Yellow-Orange  .... 401 - 425
18  .... Yellow-Green  .... 426 - 450
19  .... Yellow-Brown  .... 451 - 475
20  .... Yellow-Slate  .... 476 - 500
21  .... Violet-Blue  .... 501 - 525
22  .... Violet-Orange  .... 526 - 550
23  .... Violet-Green  .... 551 - 575
24  .... Violet-Brown  .... 576 - 600
(TABLE END)
        (6) The use of the white unit binder in cables of 100 pair or less is optional.
        (7) When desired for manufacturing reasons, two or more 25 pair groups may be bound together with nonhygroscopic and nonwicking threads or tapes into super-units. The group binders and the super-unit binders shall be colored such that the combination of the two binders shall positively identify each 25 pair group from every other 25 pair group in the cable.
        (8) Super-unit binders shall be of the colors shown in the
(TABLE START)following table:
Super-Unit Binder Colors
@h1Pair No.
@h1Binder color
1 - 600  .... White
601 - 1200  .... Red
(TABLE END)
        (e) Core wrap. (1) The core shall be completely covered with a layer of nonhygroscopic and nonwicking dielectric material. The core wrap shall be applied with an overlap.
        (2) The core wrap shall provide a sufficient heat barrier to prevent visible evidence of conductor insulation deformation or adhesion between conductors, caused by adverse heat transfer during the jacketing operation.
        (3) Engineering Information: If required for manufacturing reasons, white or uncolored binders of nonhygroscopic and nonwicking material may be applied over the core and/or core wrap.
        (f) Shield. (1) An aluminum shield, plastic coated on one side, shall be applied longitudinally over the core wrap.
        (2) The shield may be applied over the core wrap with or without corrugations (smooth) and shall be bonded to the outer jacket.
        (3) The shield overlap shall be a minimum of 3 mm (0.125 in.) for cables with core diameters of 15 mm (0.625 in.) or less and a minimum of 6 mm (0.25 in.) for cables with core diameters greater than 15 mm (0.625 in.). The core diameter is defined as the diameter under the core wrap and binding.
        (4) General requirements for application of the shielding material shall be as follows:
        (i) Successive lengths of shielding tapes may be joined during the manufacturing process by means of cold weld, electric weld, soldering with a nonacid flux, or other acceptable means;
        (ii) The metal shield with the plastic coating shall have the coating removed prior to joining the metal ends together. After joining, the plastic coating shall be restored without voids using good manufacturing techniques;
        (iii) The shields of each length of cable shall be tested for continuity. A one meter (3 ft) section of shield containing a factory joint shall exhibit not more than 110 percent of the resistance of a shield of equal length without a joint;
        (iv) The breaking strength of any section of a shield tape containing a factory joint shall not be less than 80 percent of the breaking strength of an adjacent section of the shield of equal length without a joint;
        (v) The reduction in thickness of the shielding material due to the corrugating or application process shall be kept to a minimum and shall not exceed 10 percent at any spot; and
        (vi) The shielding material shall be applied in such a manner as to enable the cable to pass the bend test as specified in paragraph (i)(1) of this section.
        (5) The dimensions of the uncoated aluminum tape shall be 0.20301B0.0254 mm (0.00801B0.0010 in.).
        (6) The aluminum tape shall conform to either Alloy AA - 1100 - 0, AA - 1145 - 0, or AA - 1235 - 0 as covered in the latest edition of Aluminum Standards and Data, issued by the Aluminum Association, except that requirements for tensile strength are waived.
        (7) The single-sided plastic coated aluminum shield shall conform to the requirements of ASTM B 736 - 92a, Type I Coating, Class 1 or 2, or Type II Coating, Class 1. The minimum thickness of the Type I Coating shall be 0.038 mm (0.0015 in.). The minimum thickness of the Type II Coating shall be 0.008 mm (0.0003 in.).
        (8) The plastic coated aluminum shield shall be tested for resistance to water migration by immersing a one meter (3 ft) length of tape under a one meter (3 ft) head of water containing a soluble dye plus 0.25 percent (%) wetting agent.
        (i) After a minimum of 5 minutes, no dye shall appear between the interface of the shield tape and the plastic coating.
        (ii) The actual test method shall be acceptable to RUS.
        (9) The bond between the plastic coated shield and the jacket shall conform to the following requirements:
        (i) Prepare test strips approximately 200 mm (8 in.) in length. Slit the jacket and shield longitudinally to produce 4 strips evenly spaced and centered in 4 quadrants on the jacket circumference. One of the strips shall be centered over the overlapped edge of the shielding tape. The strips shall be 13 mm (0.5 in.) wide. For cable diameters less than 19 mm (0.75 in.) make two strips evenly spaced.
        (ii) Separate the shield and jacket for a sufficient distance to allow the shield and jacket to be fitted in the upper and lower jaws of a tensile machine. Record the maximum force required to separate the shield and jacket to the nearest newton (pound-force). Repeat this action for each test strip.
        (iii) The force required to separate the jacket from the shield shall not be less than 9 N (2 lbf) for any individual strip when tested in accordance with paragraph (f)(9)(ii) of this section. The average force for all strips of any cable shall not be less than 18 N (4 lbf).
        (g) Cable jacket and extraneous material. (1) The jacket shall provide the cable with a tough, flexible, protective covering which can withstand stresses reasonably expected in normal installation and service.
        (2) The jacket shall be free from holes, splits, blisters, or other imperfections and shall be as smooth and concentric as is consistent with the best commercial practice.
        (3) The raw material used for the cable jacket shall be one of the following four types:
        (i) Type PVC - 55554EOXO in accordance with ASTM D 2287 - 81(1988);
        (ii) Type PVC - 65554EOXO in accordance with ASTM D 2287 - 81(1988);
        (iii) Type PVC - 55556EOXO in accordance with ASTM D 2287 - 81(1988); or
        (iv) Type PVC - 66554EOXO in accordance with ASTM D 2287 - 81(1988).
        (4) The jacketing material removed from or tested on the cable
(TABLE START)shall be capable of meeting the following performance requirements:
@h1Property
@h1Jacket performance
Tensile Strength-Unaged Minimum, MPa (psi)  .... 13.8 (2000)
Ultimate Elongation-Unaged Minimum, Percent (%)  .... 200
Tensile Strength-Aged Minimum, % of original value  .... 80
Ultimate Elongation-Aged Minimum, % of original value  .... 50
Impact Failures, Maximum  .... 2/10
(TABLE END)
        (5) Testing procedures. The procedures for testing the jacket samples for compliance with paragraph (g)(4) of this section shall be as follows:
        (i) Tensile strength and ultimate elongation-unaged. The test shall be performed in accordance with ASTM D 2633 - 82(1989), using a jaw separation speed of 50 mm/min (2 in./min).
        Note: Quality assurance testing at a jaw separation speed of 500 mm/min (20 in./min) is permissible. Failures at this rate shall be retested at the 50 mm/min (2 in./min) rate to determine specification compliance.
        (ii) Tensile strength and ultimate elongation-aged. The test shall be performed in accordance with paragraph (g)(5)(i) of this section after being aged for 7 days at a temperature of 1001B1 _C in a circulating air oven conforming to ASTM D 2436 - 85.
        (iii) Impact. The test shall be performed in accordance with ASTM D 4565 - 90a using an impact force of 4 newton-meter (3 pound force-foot) at a temperature of 101B1 _C. The cylinder shall strike the sample at the shield overlap. A crack or split in the jacket constitutes failure.
        (6) Jacket thickness. The nominal jacket thickness shall be as specified in the following table. The test method used shall be either the End Sample Method (paragraph (g)(6)(i) of this section) or the Continuous
(TABLE START)Uniformity Thickness Gauge Method (paragraph (g)(6)(ii) of this section):
@h1No. of pairs
@h1Nominal jacket thickness mm (in.)
25 or less  .... 1.4 (0.055)
50  .... 1.5 (0.060)
100  .... 1.7 (0.065)
200  .... 1.9 (0.075)
300  .... 2.2 (0.085)
400  .... 2.4 (0.095)
600  .... 2.9 (0.115)
800 and over  .... 3.3 (0.130)
(TABLE END)
        (i) End sample method. The jacket shall be capable of meeting the following requirements:
Minimum Average Thickness -- 90% of nominal thickness
Minimum Thickness -- 70% of nominal thickness
        (ii) Continuous uniformity thickness gauge method. (A) The jacket shall be capable of meeting the following requirements:
Minimum Average Thickness -- 90% of nominal thickness
Minimum (Min.) Thickness -- 70 % of nominal thickness
Maximum (Max.) Eccentricity -- 55%
Eccentricity=Max. Thickness -- Min. Thickness (Average Thickness)0A100
        (B) Maximum and minimum thickness values. The maximum and minimum thickness values shall be based on the average of each axial section.
        (7) The color of the jacket shall be either black or dark grey in conformance with the Munsell Color System specified in ASTM D 1535 - 89.
        (8) There shall be no water or other contaminants in the finished cable which would have a detrimental effect on its performance or its useful life.
        (h) Electrical requirements -- (1) Mutual capacitance and conductance. (i) The average mutual capacitance (corrected for length) of all pairs in any reel shall not exceed the following when tested in accordance with ASTM D 4566 - 90 at a frequency of 1.01B 0.1 kilohertz (kHz) and a
(TABLE START)temperature of 231B3_C:
@h1Number of cable pairs
@h1Mutual capacitance@h2Nanofarad/kilometer @h2(Nanofarad/mile)
12  .... 521B4  .... (831B7)
Over 12  .... 521B2  .... (831B4)
(TABLE END)
        (ii) The root mean square (rms) deviation of the mutual capacitance of all pairs from the average mutual capacitance of that reel shall not exceed 3.0 % when calculated in accordance with ASTM D 4566 - 90.
        (iii) The mutual conductance (corrected for length and gauge) of any pair shall not exceed 3.7 micromhos/kilometer (micromhos/km) (6.0 micromhos/mile) when tested in accordance with ASTM D 4566 - 90 at a frequency of 1.01B0.1 kHz and a temperature of 231B3_C.
        (2) Pair-to-pair capacitance unbalance. The capacitance unbalance as measured on the completed cable shall not exceed 45.3 picofarad/kilometer (pF/km) (25 picofarad/1000 ft (pF/1000 ft)) rms when tested in accordance with ASTM D 4566 - 90 at a frequency of 1.01B0.1 kHz and a temperature of 231B3_C.
        (3) Pair-to-ground capacitance unbalance. (i) The average capacitance unbalance as measured on the completed cable shall not exceed 574 pF/km (175 pF/1000 ft) when tested in accordance with ASTM D 4566 - 90 at a frequency of 11B0.1 kHz and a temperature of 231B3_C.
        (ii) When measuring pair-to-ground capacitance unbalance all pairs except the pair under test are grounded to the shield except when measuring cable containing super-units in which case all other pairs in the same super-unit shall be grounded to the shield.
        (iii) Pair-to-ground capacitance unbalance may vary directly with the length of the cable.
        (4) Crosstalk loss. (i) The rms output-to-output far-end crosstalk loss (FEXT) measured on the completed cable in accordance with ASTM D 4566 - 90 at a test frequency of 150 kHz shall not be less than 68 decibel/kilometer (dB/km) (73 decibel/1000 ft (dB/1000 ft)). The rms calculation shall be based on the combined total of all adjacent and alternate pair combinations within the same layer and center to first layer pair combinations.
        (ii) The FEXT crosstalk loss between any pair combination of a cable shall not be less than 58 dB/km (63 dB/1000 ft) at a frequency of 150 kHz. If the loss Ko at a frequency Fo for length Lo is known, then Kx can be determined for any other frequency Fx or length Lx by:
E:\PICKUP\ER14jn94.000
        (iii) The near-end crosstalk loss (NEXT) as measured within and between units of a completed cable in accordance with ASTM D 4566 - 90 at a frequency of 772 kHz shall not be less than the following mean minus sigma (M
(TABLE START)- S) crosstalk requirement for any unit within the cable:
@h1Unit size
@h1M - S decibel (dB)
        Within Unit:
12 and 13 pairs  .... 56
18 and 25 pairs  .... 60
        Between Unit:
Adjacent 13 pairs  .... 65
Adjacent 25 pairs  .... 66
Nonadjacent (all)  .... 81
(TABLE END)
Where M - S is the Mean near-end coupling loss based on the combined total of all pair combinations, less one Standard Deviation, Sigma, of the mean value.
        (5) Insulation resistance. Each insulated conductor in each length of completed cable, when measured with all other insulated conductors and the shield grounded, shall have an insulation resistance of not less than 152 megohm-kilometer (500 megohm-mile) at 201B1_C. The measurement shall be made in accordance with the procedures of ASTM D 4566 - 90.
        (6) High voltage test. (i) In each length of completed cable, the dielectric strength of the insulation between conductors shall be tested in accordance with ASTM D 4566 - 90 and shall withstand, for 3 seconds, a direct current (dc) potential whose value is not less than:
        (A) 3.6 kilovolts for 22-gauge conductors; or
        (B) 3.0 kilovolts for 24-gauge conductors.
        (ii) In each length of completed cable, the dielectric strength between the shield and all conductors in the core shall be tested in accordance with ASTM D 4566 - 90 and shall withstand, for 3 seconds, a dc potential whose value is not less than 10 kilovolts.
        (7) Conductor resistance. The dc resistance of any conductor shall be measured in the completed cable in accordance with ASTM D 4566 - 90 and shall not exceed the following values when measured at or corrected to a
(TABLE START)temperature of 201B1_C:
@h1AWG
@h1Maximum resistance@h2ohms/kilometer @h2(ohms/1000 ft)
22  .... 60.7  .... (18.5)
24  .... 95.1  .... (29.0)
(TABLE END)
        (8) Resistance unbalance. (i) The difference in dc resistance between the two conductors of a pair in the completed cable shall not exceed the values listed in this paragraph when measured in accordance
(TABLE START)with the procedures of ASTM D 4566 - 90:
@h1AWG
@h1Resistance unbalance@h2Average percent
@h1Maximum for any reel@h2Individual pair percent
22  .... 1.5  .... 4.0
24  .... 1.5  .... 5.0
(TABLE END)
        (ii) The resistance unbalance between tip and ring conductors shall be random with respect to the direction of unbalance. That is, the resistance of the tip conductors shall not be consistently higher with respect to the ring conductors and vice versa.
        (9) Electrical variations. (i) Pairs in each length of cable having either a ground, cross, short, or open circuit condition shall not be permitted.
        (ii) The maximum number of pairs in a cable which may vary as specified in paragraph (h)(9)(iii) of this section from the electrical parameters given in this section are listed in this paragraph. These pairs may
(TABLE START)be excluded from the arithmetic calculation:
@h1Nominal pair count
@h1Maximum No. of pairs with allowable electrical variation
12 - 100  .... 1
101 - 300  .... 2
301 - 400  .... 3
401 - 600  .... 4
601 and above  .... 6
(TABLE END)
        (iii) Parameter variations -- (A) Capacitance unbalance-to-ground. If the cable fails either the maximum individual pair or average capacitance unbalance-to-ground requirement and all individual pairs are 3280 pF/km (1000 pF/1000 ft) or less the number of pairs specified in paragraph (h)(9)(ii) of this section may be eliminated from the average and maximum individual calculations.
        (B) Resistance unbalance. Individual pair of not more than 7 percent for all gauges.
        (C) Far end crosstalk. Individual pair combination of not less than 52 dB/km (57 dB/1000 ft).
        Note: RUS recognizes that in large pair count cables (600 pair and above) a cross, short, or open circuit condition occasionally may develop in a pair which does not affect the performance of the other cable pairs. In these circumstances rejection of the entire cable may be economically unsound or repairs may be impractical. In such circumstances the manufacturer may desire to negotiate with the customer for acceptance of the cable. No more than 0.5 percent of the pairs may be involved.
        (i) Mechanical requirements -- (1) Cable cold bend test. The completed cable shall be capable of meeting the requirements of ASTM D 4565 - 90a after conditioning at 20 1B 2 _C except the mandrel
(TABLE START)diameters shall be as specified below:
@h1Cable outside diameter
@h1Mandrel diameter
<40 mm (1.5 in.)  .... 15x
"40 mm (1.5 in.)  .... 20x
(TABLE END)
        (2) Cable flame test. The completed cable shall be capable of meeting a maximum flame height of 3.7 m (12.0 ft) when tested in accordance with Underwriters Laboratories (UL) 1666 dated January 22, 1991.
        (3) Cable listing. All cables manufactured to the specification of this section at a minimum shall be listed as Communication Riser Cable (Type CMR) in accordance with Sections 800 - 50 and 800 - 51(b) of the 1993 National Electrical Code.
        (j) Sheath slitting cord (optional). (1) Sheath slitting cords may be used in the cable structure at the option of the manufacturer.
        (2) When a sheath slitting cord is used it shall be nonhygroscopic and nonwicking, continuous throughout a length of cable, and of sufficient strength to open the sheath without breaking the cord.
        (3) Sheath slitting cords shall be capable of consistently slitting the jacket and/or shield for a continuous length of 0.6 m (2 ft) when tested in accordance with the procedure specified in appendix B of this section.
        (k) Identification marker and length marker. (1) Each length of cable shall be permanently identified as to manufacturer and year of manufacture.
        (2) The number of conductor pairs and their gauge size shall be marked on the jacket.
        (3) The marking shall be printed on the jacket at regular intervals of not more than 1.5 m (5 ft).
        (4) An alternative method of marking may be used if accepted by RUS prior to its use.
        (5) The completed cable shall have sequentially numbered length markers in FEET OR METERS at regular intervals of not more than 1.5 m (5 ft) along the outside of the jacket.
        (6) The method of length marking shall be such that for any single length of cable, continuous sequential numbering shall be employed.
        (7) The numbers shall be dimensioned and spaced to produce good legibility and shall be approximately 3 mm (0.125 in.) in height. An occasional illegible marking is permissible if there is a legible marking located not more than 1.5 m (5 ft) from it.
        (8) The method of marking shall be by means of suitable surface markings producing a clear, distinguishable, contrasting marking acceptable to RUS. Where direct or transverse printing is employed, the characters should be indented to produce greater durability of marking. Any other method of length marking shall be acceptable to RUS as producing a marker suitable for the field. Size, shape and spacing of numbers, durability, and overall legibility of the marker shall be considered in acceptance of the method.
        (9) The accuracy of the length marking shall be such that the actual length of any cable section is never less than the length indicated by the marking and never more than one percent greater than the length indicated by the marking.
        (10) The color of the initial marking for a black colored jacket shall be either white or silver. The color of the initial marking for a dark grey colored jacket shall be either red or black. If the initial marking of the black colored jacket fails to meet the requirements of the preceding paragraphs, it will be permissible to either remove the defective marking and re-mark with the white or silver color or leave the defective marking on the cable and re-mark with yellow. If the initial marking of the dark grey colored jacket fails to meet the requirements of the preceding paragraphs, it will be permissible to either remove the defective marking and re-mark with the red or black color or leave the defective marking on the cable and re-mark with yellow. No further re-marking is permitted. Any re-marking shall be on a different portion of the cable circumference than any existing marking when possible and have a numbering sequence differing from any other existing marking by at least 5,000.
        (11) Any reel of cable which contains more than one set of sequential markings shall be labeled to indicate the color and sequence of marking to be used. The labeling shall be applied to the reel and also to the cable.
        (l) Preconnectorized cable (optional). (1) At the option of the manufacturer and upon request by the purchaser, cables 100 pairs and larger may be factory terminated in 25 pair splicing modules.
        (2) The splicing modules shall meet the requirements of RUS Bulletin 345 - 54, PE - 52, RUS Specification for Telephone Cable Splicing Connectors (Incorporated by Reference at _1755.97), and be accepted by RUS prior to their use.
        (m) Acceptance testing and extent of testing. (1) The tests described in appendix A of this section are intended for acceptance of cable designs and major modifications of accepted designs. RUS decides what constitutes a major modification. These tests are intended to show the inherent capability of the manufacturer to produce cable products having long life and stability.
        (2) For initial acceptance, the manufacturer shall submit:
        (i) An original signature certification that the product fully complies with each section of the specification;
        (ii) Qualification Test Data, per appendix A of this section;
        (iii) To periodic plant inspections;
        (iv) A certification that the product does or does not comply with the domestic origin manufacturing provisions of the ``Buy American'' requirements of the Rural Electrification Act of 1938 (7 U.S.C. 901 et seq.);
        (v) Written user testimonials concerning performance of the product; and
        (vi) Other nonproprietary data deemed necessary by the Chief, Outside Plant Branch (Telephone).
        (3) For requalification acceptance, the manufacturer shall submit an original signature certification that the product fully complies with each section of the specification, excluding the Qualification Section, and a certification that the product does or does not comply with the domestic origin manufacturing provisions of the ``Buy American'' requirements of the Rural Electrification Act of 1938 (7 U.S.C. 901 et seq.) for acceptance by June 30 every three years. The required data and certification shall have been gathered within 90 days of the submission.
        (4) Initial and requalification acceptance requests should be addressed to: Chairman, Technical Standards Committee ``A'' (Telephone), Telecommunications Standards Division, Rural Utilities Service, Washington, DC 20250 - 1500.
        (5) Tests on 100 percent of completed cable. (i) The shield of each length of cable shall be tested for continuity using the procedures of ASTM D 4566 - 90.
        (ii) Dielectric strength between all conductors and the shield shall be tested to determine freedom from grounds in accordance with paragraph (h)(6)(ii) of this section.
        (iii) Each conductor in the completed cable shall be tested for continuity using the procedures of ASTM D 4566 - 90.
        (iv) Dielectric strength between conductors shall be tested to ensure freedom from shorts and crosses in accordance with paragraph (h)(6)(i) of this section.
        (v) Each conductor in the completed preconnectorized cable shall be tested for continuity.
        (vi) Each length of completed preconnectorized cable shall be tested for split pairs.
        (vii) The average mutual capacitance shall be measured on all cables. If the average mutual capacitance for the first 100 pairs tested from randomly selected groups is between 50 and 53 nF/km (80 to 85 nF/mile), the remainder of the pairs need not to be tested on the 100 percent basis. (See paragraph (h)(1) of this section)._
        (6) Capability tests. Tests on a quality assurance basis shall be made as frequently as is required for each manufacturer to determine and maintain compliance with:
        (i) Performance requirements for conductor insulation and jacket material;
        (ii) Bonding properties of coated or laminated shielding materials;
        (iii) Sequential marking and lettering;
        (iv) Capacitance unbalance and crosstalk;
        (v) Insulation resistance;
        (vi) Conductor resistance and resistance unbalance;
        (vii) Cable cold bend and cable flame tests; and
        (viii) Mutual conductance.
        (n) Summary of records of electrical and physical tests. (1) Each manufacturer shall maintain a suitable summary of records for a period of at least 3 years for all electrical and physical tests required on completed cable by this section as set forth in paragraphs (m)(5) and (m)(6) of this section. The test data for a particular reel shall be in a form that it may be readily available to the purchaser or to RUS upon request.
        (2) Measurements and computed values shall be rounded off to the number of places of figures specified for the requirement according to ASTM E 29 - 90.
        (o) Manufacturing irregularities. (1) Repairs to the shield are not permitted in cable supplied to the end user under this section.
        (2) No repairs or defects in the jacket are allowed.
        (p) Preparation for shipment. (1) The cable shall be shipped on reels unless otherwise specified or agreed to by the purchaser. The diameter of the drum shall be large enough to prevent damage to the cable from reeling or unreeling. The reels shall be substantial and so constructed as to prevent damage to the cable during shipment and handling.
        (2) A waterproof corrugated board or other means of protection acceptable to RUS shall be applied to the reel and shall be suitably secured in place to prevent damage to the cable during storage and shipment.
        (3) The outer end of the cable shall be securely fastened to the reel head so as to prevent the cable from becoming loose in transit. The inner end of the cable shall be securely fastened in such a way as to make it readily available if required for electrical testing. Spikes, staples, or other fastening devices which penetrate the cable jacket shall not be used. The method of fastening the cable ends shall be accepted by RUS prior to it being used.
        (4) Each length of cable shall be wound on a separate reel unless otherwise specified or agreed to by the purchaser.
        (5) The arbor hole shall admit a spindle 63 mm (2.5 in.) in diameter without binding. Steel arbor hole liners may be used but shall be acceptable to RUS prior to their use.
        (6) Each reel shall be plainly marked to indicate the direction in which it should be rolled to prevent loosening of the cable on the reel.
        (7) Each reel shall be stenciled or labeled on either one or both sides with the name of the manufacturer, year of manufacture, actual shipping length, an inner and outer end sequential length marking, description of the cable, reel number and the RUS cable designation:
Cable Designation
CT
Cable Construction
Pair Count
Conductor Gauge
A = Coated Aluminum Shield
P = Preconnectorized Cable
Example: CTAP 100 - 22
Terminating Cable, Coated Aluminum Shield, Preconnectorized, 100 pairs, 22 AWG.
        (8) When preconnectorized cable is shipped, the splicing modules shall be protected to prevent damage during shipment and handling. The protection method shall be acceptable to RUS prior to its use.
(The information collection and recordkeeping requirements of this section have been approved by the Office of Management and Budget (OMB) under control number 0572 - 0059)
Appendix A to 7 CFR 1755.870 -- Qualification Test Methods
        (I) The test procedures described in this appendix are for qualification of initial designs and major modifications of accepted designs. Included in paragraph (V) of this appendix are suggested formats that may be used in submitting test results to RUS.
        (II) Sample Selection and Preparation. (1) All testing shall be performed on lengths removed sequentially from the same 25 pair, 22 gauge jacketed cable. This cable shall not have been exposed to temperatures in excess of 38 _C since its initial cool down after sheathing. The lengths specified are minimum lengths and if desirable from a laboratory testing standpoint longer lengths may be used.
        (a) Length A shall be 12 1B 0.2 meters (40 1B 0.5 feet) long. Prepare the test sample by removing the jacket, shield, and core wrap for a sufficient distance on both ends to allow the insulated conductors to be flared out. Remove sufficient conductor insulation so that appropriate electrical test connections can be made at both ends. Coil the sample with a diameter of 15 to 20 times its sheath diameter. Two lengths are required.
        (b) Length B shall be 300 millimeters (1 foot) long. Three lengths are required.
        (c) Length C shall be 3 meters (10 feet) long and shall be maintained at 23 1B 3 _C for the duration of the test. Two lengths are required.
        (2) Data Reference Temperature. Unless otherwise specified, all measurements shall be made at 23 1B 3 _C.
        (III) Environmental Tests -- (1) Heat Aging Test -- (a) Test Samples. Place one sample each of lengths A and B in an oven or environmental chamber. The ends of sample A shall exit from the chamber or oven for electrical tests. Securely seal the oven exit holes.
        (b) Sequence of Tests. Sample B referenced in paragraph (III)(1)(a) of this appendix shall be subjected to the insulation compression test outlined in paragraph (III)(2) of this appendix.
        (c) Initial Measurements. (i) For sample A, measure the open circuit capacitance and conductance for each odd pair at 1, 150, and 772 kilohertz after conditioning the sample at the data reference temperature for 24 hours. Calculate the average and standard deviation for the data of the 13 pairs on a per kilometer (per mile) basis.
        (ii) Record on suggested formats in paragraph (V) of this appendix or on other easily readable formats.
        (d) Heat Conditioning. (i) Immediately after completing the initial measurements, condition the sample for 14 days at a temperature of 65 1B 2 _C.
        (ii) At the end of this period. Measure and calculate the parameters given in paragraph (III)(1)(c) of this appendix. Record on suggested formats in paragraph (V) of this appendix or on other easily readable formats.
        (e) Overall Electrical Deviation. (i) Calculate the percent change in all average parameters between the final parameters after conditioning with the initial parameters in paragraph (III)(1)(c) of this appendix.
        (ii) The stability of the electrical parameters after completion of this test shall be within the following prescribed limits:
        (A) Capacitance. The average mutual capacitance shall be within 10 percent of its original value;
        (B) The change in average mutual capacitance shall be less than 10 percent over the frequency range of 1 to 150 kilohertz; and
        (C) Conductance. The average mutual conductance shall not exceed 3.7 micromhos/kilometer (6 micromhos/mile) at a frequency of 1 kilohertz.
        (2) Insulation Compression Test -- (a) Test Sample B. Remove jacket, shield, and core wrap being careful not to damage the conductor insulation. Remove one pair from the core and carefully separate and straighten the insulated conductors. Retwist the two insulated conductors together under sufficient tension to form 10 evenly spaced 360 degree twists in a length of 100 millimeters (4 inches).
        (b) Sample Testing. Center the mid 50 millimeters (2 inches) of the twisted pair between two smooth rigid parallel metal plates measuring 50 millimeters (2 inches) in length or diameter. Apply a 1.5 volt direct current potential between the conductors, using a light or buzzer to indicate electrical contact between the conductors. Apply a constant load of 67 newtons (15 pound-force) on the sample for one minute and monitor for evidence of contact between the conductors. Record results on suggested formats in paragraph (V) of this appendix or on other easily readable formats.
        (3) Temperature Cycling. (a) Repeat paragraphs (III)(1)(a) through (III)(1)(c)(ii) of this appendix for a separate set of samples A and B which have not been subjected to prior environmental conditioning.
        (b) Immediately after completing the measurements, subject the test samples to 10 cycles of temperature between 40 _C and +60 _C. The test samples shall be held at each temperature extreme for a minimum of 1.5 hours during each cycle of temperature. The air within the temperature cycling chamber shall be circulated throughout the duration of the cycling.
        (c) Repeat paragraphs (III)(1)(d)(ii) through (III)(2)(b) of this appendix.
        (IV) Control Sample -- (1) Test Samples. One length of sample B shall have been maintained at 23 1B 3 _C for at least 48 hours before the testing.
        (2) Repeat paragraphs (III)(2) through (III)(2)(b) of this appendix.
        (3) Surge Test. (a) One length of sample C shall be used to measure the breakdown between conductors while the other length of C shall be used to measure core to shield breakdown.
        (b) The samples shall be capable of withstanding, without damage, a single surge voltage of 20 kilovolts peak between conductors, and 35 kilovolts peak between conductors and the shield as hereinafter described. The surge voltage shall be developed from a capacitor discharge through a forming resistor connected in parallel with the dielectric of the test sample. The surge generator constants shall be such as to produce a surge of 1.5 0A 40 microseconds wave shape.
        (c) The shape of the generated wave shall be determined at a reduced voltage by connecting an oscilloscope across the forming resistor with the cable sample connected in parallel with the forming resistor. The capacitor bank is charged to the test voltage and then discharged through the forming resistor and test sample. The test sample shall be considered to have passed the test if there is no distinct change in the wave shape obtained with the initial reduced voltage compared to that obtained after the application of the test voltage.
        (V) The following suggested formats may be used in submitting the test results to RUS:
(TABLE START)
Environmental Conditioning XXXXXXXXXX
Frequency 1 Kilohertz
@h1Pair No.
@h1Capacitance nF/km (nF/mile) @h2Initial @h2Final
@h1Conductance micromhos/km (micromhos/mile) @h2Initial @h2Final
 1  ....  ....  ....  ....
 3  ....  ....  ....  ....
 5  ....  ....  ....  ....
 7  ....  ....  ....  ....
 9  ....  ....  ....  ....
11  ....  ....  ....  ....
13  ....  ....  ....  ....
15  ....  ....  ....  ....
17  ....  ....  ....  ....
19  ....  ....  ....  ....
21  ....  ....  ....  ....
23  ....  ....  ....  ....
25  ....  ....  ....  ....
Average xAE8  ....  ....  ....  ....
        Overall Percent Difference in
Average xAE8  ....  ....  ....  ....
(TABLE END)
(TABLE START)
Environmental Conditioning XXXXXXXXXX
Frequency 150 Kilohertz
@h1Pair No.
@h1Capacitance nF/km (nF/mile) @h2Initial @h2Final
@h1Conductance micromhos/km (micromhos/mile) @h2Initial @h2Final
 1  ....   ....   ....   ....
 3  ....   ....   ....   ....
 5  ....   ....   ....   ....
 7  ....   ....   ....   ....
 9  ....   ....   ....   ....
11  ....   ....   ....   ....
13  ....   ....   ....   ....
15  ....   ....   ....   ....
17  ....   ....   ....   ....
19  ....   ....   ....   ....
21  ....   ....   ....   ....
23  ....   ....   ....   ....
25  ....   ....   ....   ....
Average xAE8  ....   ....   ....   ....
Overall Percent Difference in Average xAE8  ....   ....   ....   ....
(TABLE END)
(TABLE START)
Environmental Conditioning XXXXXXXXXX
Frequency 772 Kilohertz
@h1Pair No.
@h1Capacitance nF/km (nF/mile) @h2Initial @h2Final
@h1Conductance micromhos/km (micromhos/mile) @h2Initial @h2Final
 1  ....   ....   ....   ....
 3  ....   ....   ....   ....
 5  ....   ....   ....   ....
 7  ....   ....   ....   ....
 9  ....   ....   ....   ....
11  ....   ....   ....   ....
13  ....   ....   ....   ....
15  ....   ....   ....   ....
17  ....   ....   ....   ....
19  ....   ....   ....   ....
21  ....   ....   ....   ....
23  ....   ....   ....   ....
25  ....   ....   ....   ....
Average xAE8  ....   ....   ....   ....
Overall Percent Difference in
(TABLE START)
Average xAE8  ....   ....   ....   ....
(TABLE END)
@h1
@h1Failures
Insulation Compression:
Control  ....
Heat Age  ....
Temperature Cycling  ....
Surge Test (kilovolts):
Conductor-to-Conductor  ....
Shield-to-Conductors  ....
(TABLE END)
Appendix B to 7 CFR 1755.870 -- Sheath Slitting Cord Qualification
        (I) This test procedure described in this appendix is for qualification of initial and subsequent changes in sheath slitting cords.
        (II) Sample selection. All testing shall be performed on two 1.2 m (4 ft) lengths of cable removed sequentially from the same 25 pair, 22 gauge jacketed cable. This cable shall not have been exposed to temperatures in excess of 38 _C since its initial cool down after sheathing.
        (III) Test procedure. (1) Using a suitable tool, expose enough of the sheath slitting cord to permit grasping with needle nose pliers.
        (2) The prepared test specimens shall be maintained at a temperature of 23 1B 1 _C for at least 4 hours immediately prior to and during the test.
        (3) Wrap the sheath slitting cord around the plier jaws to ensure a good grip.
        (4) Grasp and hold the cable in a convenient position while gently and firmly pulling the sheath slitting cord longitudinally in the direction away from the cable end. The angle of pull may vary to any convenient and functional degree. A small starting notch is permissible.
        (5) The sheath slitting cord is considered acceptable if the cord can slit the jacket and/or shield for a continuous length of 0.6 m (2 ft) without breaking the cord.
[59 FR 30507, June 14, 1994; 59 FR 34899, July 7, 1994, as amended at 60 FR 1711, Jan. 5, 1995]
_1755.890   RUS specification for filled telephone cables with expanded insulation.
        (a) Scope. (1) This section covers the requirements for filled telephone cables intended for direct burial installation either by trenching or by direct plowing, for underground application by placement in a duct, or for aerial installation by attachment to a support strand.
        (i) The conductors are solid copper, individually insulated with an extruded cellular insulating compound which may be either totally expanded or expanded with a solid skin coating.
        (ii) The insulated conductors are twisted into pairs which are then stranded or oscillated to form a cylindrical core.
        (iii) For high frequency applications, the cable core may be separated into compartments with screening shields.
        (iv) A moisture resistant filling compound is applied to the stranded conductors completely covering the insulated conductors and filling the interstices between pairs and units.
        (v) The cable structure is completed by the application of suitable core wrapping material, a flooding compound, a shield or a shield/armor, and an overall plastic jacket.
        (2) The number of pairs and gauge size of conductors which are
(TABLE START)used within the RUS program are provided in the following table:
@h1
@h1
@h1
@h1
@h1
        AWG  .... 19  .... 22  .... 24  .... 26
        Pairs  .... 6  .... 6  .... 6  ....
           .... 12  .... 12  .... 12  ....
           .... 18  .... 18  .... 18  ....
           .... 25  .... 25  .... 25  .... 25
           ....    .... 50  .... 50  .... 50
           ....    .... 75  .... 75  .... 75
           ....    .... 100  .... 100  .... 100
           ....    .... 150  .... 150  .... 150
           ....    .... 200  .... 200  .... 200
           ....    .... 300  .... 300  .... 300
           ....    .... 400  .... 400  .... 400
           ....    .... 600  .... 600  .... 600
           ....    .... 900  .... 900  .... 900
           ....    .... 1000  .... 1000  .... 1000
           ....    ....    .... 1200  .... 1200
           ....    ....    .... 1500  .... 1500
           ....    ....    .... 1800  .... 1800
           ....    ....    ....    .... 2100
           ....    ....    ....    .... 2400
           ....    ....    ....    .... 2700
Footnote: Note: Cables larger in pair sizes than those shown in this table must meet all requirements of this section.
(TABLE END)
        (3) Screened cable, when specified, must meet all requirements of this section. The pair sizes of screened cables used within the RUS program are referenced in paragraph (e)(2)(i) of this section.
        (4) All cables sold to RUS borrowers for projects involving RUS loan funds under this section must be accepted by RUS Technical Standards Committee ``A'' (Telephone). For cables manufactured to the specification of this section, all design changes to an accepted design must be submitted for acceptance. RUS will be the sole authority on what constitutes a design change.
        (5) Materials, manufacturing techniques, or cable designs not specifically addressed by this section may be allowed if accepted by RUS. Justification for acceptance of modified materials, manufacturing techniques, or cable designs must be provided to substantiate product utility and long-term stability and endurance.
        (6) The American National Standard Institute/Insulated Cable Engineers Association, Inc. (ANSI/ICEA) S-84 - 608 - 1988, Standard For Telecommunications Cable, Filled, Polyolefin Insulated, Copper Conductor Technical Requirements referenced throughout this section is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of ANSI/ICEA S-84 - 608 - 1988 are available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from ICEA, P. O. Box 440, South Yarmouth, MA 02664, telephone number (508) 394 - 4424.
        (7) American Society for Testing and Materials specifications (ASTM) A 505-87, Standard Specification for Steel, Sheet and Strip, Alloy, Hot-Rolled and Cold-Rolled, General Requirements For; ASTM B 193-87, Standard Test Method for Resistivity of Electrical Conductor Materials; ASTM B 224-80, Standard Classification of Coppers; ASTM B 694-86, Standard Specification for Copper, Copper Alloy, and Copper-Clad Stainless Steel Sheet and Strip for Electrical Cable Shielding; ASTM D 4565-90a, Standard Test Methods for Physical and Environmental Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable; and ASTM D 4566-90, Standard Test Methods for Electrical Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable referenced in this section are incorporated by reference by RUS. These incorporations by references were approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of the ASTM standards are available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies area available from ASTM, 1916 Race Street, Philadelphia, PA 19103 - 1187, telephone number (215) 299 - 5585.
        (b) Conductors and conductor insulation. (1) The gauge sizes of the copper conductors covered by this section must be 19, 22, 24, and 26 American Wire Gauge (AWG).
        (2) Each conductor must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 2.1.
        (3) Factory joints made in conductors during the manufacturing process must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 2.2.
        (4) The raw materials used for conductor insulation must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 3.1 through 3.1.3.
        (5) The finished conductor insulation must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 3.2.2, 3.2.3, and 3.3.
        (6) Insulated conductor must not have an overall diameter greater than 2 millimeters (mm) (0.081 inch (in.)).
        (7) A permissible overall performance level of faults in conductor insulation must average not greater than one fault per 12,000 conductor meters (40,000 conductor feet) for each gauge of conductor.
        (i) All insulated conductors must be continuously tested for insulation faults during the twinning operation with a method of testing acceptable to RUS. The length count and number of faults must be recorded. The information must be retained for a period of 6 months and be available for review by RUS when requested.
        (ii) The voltages for determining compliance with the requirements
(TABLE START)of this section are as follows:
@h1AWG
@h1Direct Current Voltages (kilovolts)
        19  .... 4.5
        22  .... 3.6
        24  .... 3.0
        26  .... 2.4
(TABLE END)
        (8) Repairs to the conductor insulation during manufacture are permissible. The method of repair must be accepted by RUS prior to its use. The repaired insulation must be capable of meeting the relevant electrical requirements of this section.
        (9) All repaired sections of insulation must be retested in the same manner as originally tested for compliance with paragraph (b)(7) of this section.
        (10) The colored insulating material removed from or tested on the conductor, from a finished cable, must meet the performance requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 3.4.1 through 3.4.6.
        (c) Identification of pairs and twisting of pairs. (1) The insulation must be colored to identify:
        (i) The tip and ring conductor of each pair; and
        (ii) Each pair in the completed cable.
        (2) The colors to be used in the pairs in the 25 pair group, together with the pair numbers must be in accordance with the table specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 3.5.
        (3) Positive identification of the tip and ring conductors of each pair by marking each conductor of a pair with the color of its mate is permissible. The method of marking must be accepted by RUS prior to its use.
        (4) Other methods of providing positive identification of the tip and ring conductors of each pair may be employed if accepted by RUS prior to its use.
        (5) The insulated conductors must be twisted into pairs.
        (6) In order to provide sufficiently high crosstalk isolation, the pair twists must be designed to enable the cable to meet the capacitance unbalance and crosstalk loss requirements of paragraphs (k)(5), (k)(6), and (k)(8) this section.
        (7) The average length of pair twists in any pair in the finished cable, when measured on any 3 meter (10 foot) length, must not exceed the requirement specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 3.5.
        (d) Forming of the cable core. (1) Twisted pairs must be assembled in such a way as to form a substantially cylindrical group.
        (2) When desired for lay-up reasons, the basic group may be divided into two or more subgroups called units.
        (3) Each group, or unit in a particular group, must be enclosed in bindings of the colors indicated for its particular pair count. The pair count, indicated by the colors of insulation, must be consecutive as indicated in paragraph (d)(6) of this section through units in a group.
        (4) The filling compound must be applied to the cable core in such a way as to provide as near a completely filled core as is commercially practical.
        (5) Threads and tapes used as binders must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 4.2 and 4.2.1.
        (6) The colors of the bindings and their significance with respect
(TABLE START)to pair count must be as follows:
@h1Group No.
@h1Color of Bindings
@h1Group Pair Count
        1  .... White-Blue  .... 1 - 25
        2  .... White-Orange  .... 26 - 50
        3  .... White-Green  .... 51 - 75
        4  .... White-Brown  .... 76 - 100
        5  .... White-Slate  .... 101 - 125
        6  .... Red-Blue  .... 126 - 150
        7  .... Red-Orange  .... 151 - 175
        8  .... Red-Green  .... 176 - 200
        9  .... Red-Brown  .... 201 - 225
        10  .... Red-Slate  .... 226 - 250
        11  .... Black-Blue  .... 251 - 275
        12  .... Black-Orange  .... 276 - 300
        13  .... Black-Green  .... 301 - 325
        14  .... Black-Brown  .... 326 - 350
        15  .... Black-Slate  .... 351 - 375
        16  .... Yellow-Blue  .... 376 - 400
        17  .... Yellow-Orange  .... 401 - 425
        18  .... Yellow-Green  .... 426 - 450
        19  .... Yellow-Brown  .... 451 - 475
        20  .... Yellow-Slate  .... 476 - 500
        21  .... Violet-Blue  .... 501 - 525
        22  .... Violet-Orange  .... 526 - 550
        23  .... Violet-Green  .... 551 - 575
        24  .... Violet-Brown  .... 576 - 600
(TABLE END)
        (7) The use of the white unit binder in cables of 100 pairs or less is optional.
        (8) When desired for manufacturing reasons, two or more 25 pair groups may be bound together with nonhygroscopic and nonwicking threads or tapes into a super-unit. Threads or tapes must meet the requirements specified in paragraph (d)(5) of this section. The group binders and the super-unit binders must be color coded such that the combination of the two binders must positively identify each 25 pair group from every other 25 pair group in the
(TABLE START)cable. Super-unit binders must be of the color shown in the following table:
Super-Unit Binder Colors
@h1Pair Numbers
@h1Binder Color
        1 - 600  .... White
        601 - 1200  .... Red
        1201 - 1800  .... Black
        1801 - 2400  .... Yellow
        2401 - 3000  .... Violet
        3001 - 3600  .... Blue
        3601 - 4200  .... Orange
        4201 - 4800  .... Green
        4801 - 5400  .... Brown
        5401 - 6000  .... Slate
(TABLE END)
        (9) Color binders must not be missing for more than 90 meters (300 feet) from any 25 pair group or from any subgroup used as part of a super-unit. At any cable cross-section, no adjacent 25 pair groups and no more than one subgroup of any super-unit may have missing binders. In no case must the total number of missing binders exceed three. Missing super-unit binders must not be permitted for any distance.
        (10) Any reel of cable which contains missing binders must be labeled indicating the colors and location of the binders involved. The labeling must be applied to the reel and also to the cable.
        (e) Screened cable. (1) Screened cable must be constructed such that a metallic, internal screen(s) must be provided to separate and provide sufficient isolation between the compartments to meet the requirements of this section.
        (2) At the option of the user or manufacturer, identified service pairs providing for voice order and fault location may be placed in screened cables.
        (i) The number of service pairs provided must be one per twenty-five operating pairs plus two for a cable size up to and including 400 pairs, subject to a minimum of four service pairs.The pair counts for screened cables
(TABLE START)are as follows:
Screened Cable Pair Counts
@h1Carrier Pair Count
@h1Service Pairs
@h1Total Pair Count
        24  .... 4  .... 28
        50  .... 4  .... 54
        100  .... 6  .... 106
        150  .... 8  .... 158
        200  .... 10  .... 210
        300  .... 14  .... 314
        400  .... 18  .... 418
(TABLE END)
        (ii) The service pairs must be equally divided among the compartments. The color sequence must be repeated in each compartment.
        (iii) The electrical and physical characteristics of each service pair must meet all the requirements set forth in this section.
        (iv) The colors used for the service pairs must be in accordance with the requirements of paragraph (b)(5) of this section. The color code used for the service pairs together with the service pair number are shown in the
(TABLE START)following table:
Color Code For Service Pairs
@h1Service Pair No.
@h1Color@h2Tip@h2Ring
        1  .... White  .... Red
        2  ....  ``  .... Black
        3  ....  ``  .... Yellow
        4  ....  ``  .... Violet
        5  .... Red  .... Black
        6  ....  ``  .... Yellow
        7  ....  ``  .... Violet
        8  .... Black  .... Yellow
        9  ....  ``  .... Violet
(TABLE END)
        (3) The screen tape must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 5.1 through 5.4.
        (4) The screen tape must be tested for dielectric strength by completely removing the protective coating from one end to be used for grounding purposes.
        (i) Using an electrode, over a 30 centimeter (1 foot) length, apply a direct current (dc) voltage at the rate of rise of 500 volts/second until failure.
        (ii) No breakdown should occur below 8 kilovolts.
        (f) Filling compound. (1) After or during the stranding operation and prior to application of the core wrap, filling compound must be applied to the cable core. The compound must be as nearly colorless as is commercially feasible and consistent with the end product requirements and pair identification.
        (2) The filling compound must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 4.4 through 4.4.4.
        (3) The individual cable manufacturer must satisfy RUS that the filling compound selected for use is suitable for its intended application. The filling compound must be applied to the cable in such a manner that the cable components will not be degraded.
        (g) Core wrap. (1) The core wrap must comply with the requirements specified in ANSI/ICEA-S-84 - 608 - 1988, paragraph 4.3.
        (2) If required for manufacturing reasons, white or colored binders of nonhygroscopic and nonwicking material may be applied over the core and/or wrap. When used, binders must meet the requirements specified in paragraph (d)(5) of this section.
        (3) Sufficient filling compound must have been applied to the core wrap so that voids or air spaces existing between the core and the inner side of the core wrap are minimized.
        (h) Flooding compound. (1) Sufficient flooding compound must be applied on all sheath interfaces so that voids and air spaces in these areas are minimized. When the optional armored design is used, the flooding compound must be applied between the core wrap and shield, between the shield and armor, and between the armor and the jacket so that voids and air spaces in these areas are minimized. The use of floodant over the outer metallic substrate is not required if uniform bonding, per paragraph (i)(7) of this section, is achieved between the plastic-clad metal and the jacket.
        (2) The flooding compound must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 4.5 and the jacket slip test requirements of appendix A, paragraph (III)(5) of this section.
        (3) The individual cable manufacturer must satisfy RUS that the flooding compound selected for use is acceptable for the application.
        (i) Shield and optional armor. (1) A single corrugated shield must be applied longitudinally over the core wrap.
        (2) For unarmored cable the shield overlap must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.2. Core diameter is defined as the diameter under the core wrap and binding.
        (3) For cables containing the coated aluminum shield/coated steel armor (CACSP) sheath design, the coated aluminum shield must be applied in accordance with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.2, Dual Tape Shielding System.
        (4) General requirements for application of the shielding material are as follows:
        (i) Successive lengths of shielding tapes may be joined during the manufacturing process by means of cold weld, electric weld, soldering with a nonacid flux or other acceptable means.
        (ii) Shield splices must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.3.
        (iii) The corrugations and the application process of the coated aluminum and copper bearing shields must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.1.
        (iv) The shielding material must be applied in such a manner as to enable the cable to pass the cold bend test specified in paragraph (l)(3) of this section.
        (5) The following is a list of acceptable materials for use as cable shielding. Other types of shielding materials may also be used provided
(TABLE START)they are accepted by RUS prior to their use.
@h1Standard Cable
@h1Gopher Resistant Cable
        8-mil Coated Aluminum1  .... 10-mil Copper
        5-mil Copper  .... 6-mil Copper-CladStainless Steel5 mil Copper-CladStainless Steel5 mil Copper-Clad AlloySteel7-mil Alloy 1946-mil Alloy 1948-mil Coated Aluminum1and 6-mil Coated Steel1
Footnote: \1\Dimensions of uncoated metal.
(TABLE END)
        (i) The 8-mil aluminum tape must be plastic coated on both sides and must comply with the requirements of ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.2.
        (ii) The 5-mil copper tape must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.3.
        (iii) The 10-mil copper tape must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.4.
        (iv) The 6-mil copper clad stainless steel tape must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.5.
        (v) The 5-mil copper clad stainless steel tape must be in the fully annealed condition and must conform to the requirements of American Society for Testing and Materials (ASTM) B 694 - 86, with a cladding ratio of 16/68/16.
        (A) The electrical conductivity of the clad tape must be a minimum of 28 percent of the International Annealed Copper Standard (IACS) when measured per ASTM B 193 - 87.
        (B) The tape must be nominally 0.13 millimeter (0.005 inch) thick with a minimum thickness of 0.11 millimeter (0.0045 inch).
        (vi) The 5-mil copper clad alloy steel tape must be in the fully annealed condition and the copper component must conform to the requirements of ASTM B 224 - 80 and the alloy steel component must conform to the requirements of ASTM A 505 - 87, with a cladding ratio of 16/68/16.
        (A) The electrical conductivity of the copper clad alloy steel tape must comply with the requirement specified in (5)(v)(A) of this section.
        (B) The thickness of the copper clad alloy steel tape must comply with the requirements specified in (5)(v)(B) of this section.
        (vii) The 6-mil and 7-mil 194 copper alloy tapes must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.6.
        (6) The corrugation extensibility of the coated aluminum shield must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.4.
        (7) When the jacket is bonded to the plastic coated aluminum shield, the bond between the jacket and shield must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 7.2.6.
        (8) A single plastic coated steel corrugated armor must be applied longitudinally directly over the coated aluminum shield listed in paragraph (i)(5) of this section with an overlap complying with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.2, Outer Steel Tape.
        (9) Successive lengths of steel armoring tapes may be joined during the manufacturing process by means of cold weld, electric weld, soldering with a nonacid flux or other acceptable means. Armor splices must comply with the breaking strength and resistance requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.3.
        (10) The corrugations and the application process of the coated steel armor must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.1.
        (i) The corrugations of the armor tape must coincide with the corrugations of the coated aluminum shield.
        (ii) Overlapped portions of the armor tape must be in register (corrugations must coincide at overlap) and in contact at the outer edge.
        (11) The armoring material must be so applied to enable the cable to pass the cold bend test specified in paragraph (l)(3) of this section.
        (12) The 6-mil steel tape must be electrolytic chrome coated steel (ECCS) plastic coated on both sides and must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.8.
        (13) When the jacket is bonded to the plastic coated steel armor, the bond between the jacket and armor must comply with the requirement specified in ANSI/ICEA-S-84 - 608 - 1988, paragraph 7.2.6.
        (j) Cable jacket. (1) The jacket must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 7.2.
        (2) The raw materials used for the cable jacket must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 7.2.1.
        (3) Jacketing material removed from or tested on the cable must meet the performance requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 7.2.3 and 7.2.4.
        (4) The thickness of the jacket must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 7.2.2.
        (k) Electrical requirements -- (1) Conductor resistance. The direct current resistance of any conductor in a completed cable and the average resistance of all conductors in a Quality Control Lot must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.1.
        (2) Resistance unbalance. (i) The direct current resistance unbalance between the two conductors of any pair in a completed cable and the average resistance unbalance of all pairs in a completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.2.
        (ii) The resistance unbalance between tip and ring conductors shall be random with respect to the direction of unbalance. That is, the resistance of the tip conductors shall not be consistently higher with respect to the ring conductors and vice versa.
        (3) Mutual capacitance. The average mutual capacitance of all pairs in a completed cable and the individual mutual capacitance of any pair in a completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.3.
        (4) Capacitance difference. (i) The capacitance difference for completed cables having 75 pairs or greater must comply with the requirement specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.4.
        (ii) When measuring screened cable, the inner and outer pairs must be selected from both sides of the screen.
        (5) Pair-to-pair capacitance unbalance -- (i) Pair-to-pair. The capacitance unbalance as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.5.
        (ii) Screened cable. In cables with 25 pairs or less and within each group of multigroup cables, the pair-to-pair capacitance unbalance between any two pairs in an individual compartment must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.5. The pair-to-pair capacitance unbalances to be considered must be:
        (A) Between pairs adjacent in a layer in an individual compartment;
        (B) Between pairs in centers of 4 pairs or less in an individual compartment; and
        (C) Between pairs in adjacent layers in an individual compartment when the number of pairs in the inner (smaller) layer is 6 or less. The center is counted as a layer.
        (iii) In cables with 25 pairs or less, the root-mean-square (rms) value is to include all the pair-to-pair unbalances measured for each compartment separately.
        (iv) In cables containing more than 25 pairs, the rms value must include the pair-to-pair unbalances in the separate compartments.
        (6) Pair-to-ground capacitance unbalance -- (i) Pair-to-ground. The capacitance unbalance as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.6.
        (ii) When measuring pair-to-ground capacitance unbalance all pairs except the pair under test are grounded to the shield and/or shield/armor except when measuring cables containing super units in which case all other pairs in the same super unit must be grounded to the shield.
        (iii) The screen tape must be left floating during the test.
        (iv) Pair-to-ground capacitance unbalance may vary directly with the length of the cable.
        (7) Attenuation. (i) For nonscreened and screened cables, the average attenuation of all pairs on any reel when measured at 150 and 772 kilohertz must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.7, Foam and/or Foam-Skin Column.
        (ii) For T1C type cables over 12 pairs, the maximum average attenuation of all pairs on any reel must not exceed the values listed below when measured at a frequency of 1576 kilohertz at or corrected to a temperature of 20 1B 1C. The test must be conducted in
(TABLE START)accordance with ASTM D 4566 - 90.
@h1AWG
@h1Maximum Average Attenuation decibel/kilometer (dB/km) (decibel/mile)
19  .... 14.9 (24.0)
22  .... 21.6 (34.8)
24  .... 27.2 (43.8)
(TABLE END)
        (8) Crosstalk loss. (i) The equal level far-end power sum crosstalk loss (FEXT) as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.8, FEXT Table.
        (ii) The near-end power sum crosstalk loss (NEXT) as measured on completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.8, NEXT Table.
        (iii) Screened cable. (A) For screened cables the NEXT as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 8.9 and 8.9.1.
        (B) For T1C screened cable the NEXT as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 8.9 and 8.9.2.
        (9) Insulation resistance. The insulation resistance of each insulated conductor in a completed cable must comply with the requirement specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.11.
        (10) High voltage test. (i) In each length of completed cable, the insulation between conductors must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.12, Foam and/or Foam-Skin Column.
        (ii) In each length of completed cable, the dielectric between the shield and/or armor and conductors in the core must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.13, Single Jacketed, Foam and/or Foam-Skin Column. In screened cable the screen tape must be left floating.
        (iii) Screened cable. (A) In each length of completed screened cable, the dielectric between the screen tape and the conductors in the core must comply with the requirement specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.14.
        (B) In this test, the cable shield and/or armor must be left floating.
        (11) Electrical variations. (i) Pairs in each length of cable having either a ground, cross, short, or open circuit condition will not be permitted.
        (ii) The maximum number of pairs in a cable which may vary as specified in paragraph (k)(11)(iii) of this section from the electrical parameters given in this section are listed below. These pairs may be excluded
(TABLE START)from the arithmetic calculation.
@h1Nominal Pair Count
@h1Maximum Number of Pairs With Allowable Electrical Variation
6 - 100  .... 1
101 - 300  .... 2
301 - 400  .... 3
401 - 600  .... 4
601 and above  .... 6
(TABLE END)
        (iii) Parameter variations. (A) Capacitance unbalance-to-ground. If the cable fails either the maximum individual pair or average capacitance unbalance-to-ground requirement and all individual pairs are 3937 picofarad/kilometer (1200 picofarad/1000 feet) or less, the number of pairs specified in paragraph (k)(11)(ii) of this section may be eliminated from the average and maximum individual calculations.
        (B) Resistance unbalance. Individual pair of 7 percent for all gauges.
        (C) Conductor resistance, maximum. The following table shows
(TABLE START)maximum conductor resistance:
@h1AWG
@h1ohms/kilometer
@h1(ohms/1000 feet)
        19  .... 29.9  .... ( 9.1)
        22  .... 60.0  .... (18.3)
        24  .... 94.5  .... (28.8)
        26  .... 151.6  .... (46.2)
Footnote: Note: RUS recognizes that in large pair count cable (600 pair and above) a cross, short, or open circuit condition occasionally may develop in a pair which does not affect the performance of the other cable pairs. In these circumstances rejection of the entire cable may be economically unsound or repairs may be impractical. In such circumstances the manufacturer may desire to negotiate with the customer for acceptance of the cable. No more than 0.5 percent of the pairs may be involved.
(TABLE END)
        (l) Mechanical requirements -- (1) Compound flow test. All cables manufactured in accordance with the requirements of this section must be capable of meeting the compound flow test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.1 using a test temperature of 80 1B 1C.
        (2) Water penetration test. All cables manufactured in accordance with the requirements of this section must be capable of meeting the water penetration test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.2.
        (3) Cable cold bend test. All cables manufactured in accordance with the requirements of this section must be capable of meeting the cable cold bend test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.3.
        (4) Cable impact test. All cables manufactured in accordance with the requirements of this section must be capable of meeting the cable impact test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.4.
        (5) Jacket notch test (CACSP sheath only). All cables utilizing the coated aluminum/coated steel sheath (CACSP) design manufactured in accordance with the requirements of this section must be capable of meeting the jacket notch test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.5.
        (6) Cable torsion test (CACSP sheath only). All cables utilizing the coated aluminum/coated steel sheath (CACSP) design manufactured in accordance with the requirements of this section must be capable of meeting the cable torsion test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.6.
        (m) Sheath slitting cord (optional). (1) Sheath slitting cord may be used in the cable structure at the option of the manufacturer unless specified by the end user.
        (2) When a sheath slitting cord is used it must be nonhygroscopic and nonwicking, continuous throughout a length of cable and of sufficient strength to open the sheath without breaking the cord.
        (n) Identification marker and length marker. (1) Each length of cable must be identified in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraphs 10.1 through 10.1.4. The color of the ink used for the initial outer jacket marking must be either white or silver.
        (2) The markings must be printed on the jacket at regular intervals of not more than 0.6 meter (2 feet).
        (3) The completed cable must have sequentially numbered length markers in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 10.1.5. The color of the ink used for the initial outer jacket marking must be either white or silver.
        (o) Preconnectorized cable (optional). (1) At the option of the manufacturer and upon request by the purchaser, cables 100 pairs and larger may be factory terminated in 25 pair splicing modules.
        (2) The splicing modules must meet the requirements of RUS Bulletin 345 - 54, PE-52, RUS Specification for Telephone Cable Splicing Connectors (Incorporated by Reference at _1755.97), and be accepted by RUS prior to their use.
        (p) Acceptance testing and extent of testing. (1) The tests described in appendix A of this section are intended for acceptance of cable designs and major modifications of accepted designs. What constitutes a major modification is at the discretion of RUS. These tests are intended to show the inherent capability of the manufacturer to produce cable products having long life and stability.
        (2) For initial acceptance, the manufacturer must submit:
        (i) An original signature certification that the product fully complies with each section of the specification;
        (ii) Qualification Test Data, per appendix A of this section;
        (iii) To periodic plant inspections;
        (iv) A certification that the product does or does not comply with the domestic origin manufacturing provisions of the ``Buy American'' requirements of the Rural Electrification Act of 1938 (7 U.S.C. 901 et seq.);
        (v) Written user testimonials concerning field performance of the product; and
        (vi) Other nonproprietary data deemed necessary by the Chief, Outside Plant Branch (Telephone).
        (3) For requalification acceptance, the manufacturer must submit an original signature certification that the product fully complies with each section of the specification, excluding the Qualification Section, and a certification that the product does or does not comply with the domestic origin manufacturing provisions of the ``Buy American'' requirements of the Rural Electrification Act of 1938 (7 U.S.C. 901 et seq.), for acceptance by August 30 of each year. The required data must have been gathered within 90 days of the submission. If the initial acceptance of a product to this specification was within 180 days of August 30, then requalification for that product will not be required for that year.
        (4) Initial and requalification acceptance requests should be addressed to:
        Chairman, Technical Standards Committee ``A'' (Telephone), Telecommunications Standard Division, Rural Utilities Service, Washington, DC 20250 - 1500.
        (5) Tests on 100 percent of completed cable. (i) The shield and/or armor of each length of cable must be tested for continuity in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 8.16.
        (ii) The screen tape of each length of screened cable must be tested for continuity in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 8.16.
        (iii) Dielectric strength between conductors and shield and/or armor must be tested to determine freedom from grounds in accordance with paragraph (k)(10)(ii) of this section.
        (iv) Dielectric strength between conductors and screen tape must be tested to determine freedom from grounds in accordance with paragraph (k)(10)(iii) of this section.
        (v) Each conductor in the completed cable must be tested for continuity in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 8.16.
        (vi) Dielectric strength between conductors, in each length of completed cable, must be tested to insure freedom from shorts and crosses in each length of completed cable in accordance with paragraph (k)(10)(i) of this section.
        (vii) Each conductor in the completed preconnectorized cable must be tested for continuity.
        (viii) Each length of completed preconnectorized cable must be tested for split pairs.
        (ix) The average mutual capacitance must be measured on all cables. If the average mutual capacitance for the first 100 pairs tested from randomly selected groups is between 50 and 53 nanofarads/kilometer (nF/km) (80 and 85 nanofarad/mile), the remainder of the pairs need not be tested on the 100 percent basis (See paragraph (k)(3) of this section).
        (6) Capability tests. Tests on a quality assurance basis must be made as frequently as is required for each manufacturer to determine and maintain compliance with:
        (i) Performance requirements for conductor insulation, jacketing material, and filling and flooding compounds;
        (ii) Bonding properties of coated or laminated shielding and armoring materials and performance requirements for screen tape;
        (iii) Sequential marking and lettering;
        (iv) Capacitance difference, capacitance unbalance, crosstalk, and attenuation;
        (v) Insulation resistance, conductor resistance, and resistance unbalance;
        (vi) Cable cold bend and cable impact tests;
        (vii) Water penetration and compound flow tests; and
        (viii) Jacket notch and cable torsion tests.
        (q) Summary of records of electrical and physical tests. (1) Each manufacturer must maintain suitable summary records for a period of at least 3 years of all electrical and physical tests required on completed cable by this section as set forth in paragraphs (p)(5) and (p)(6) of this section. The test data for a particular reel must be in a form that it may be readily available to the purchaser or to RUS upon request.
        (2) Measurements and computed values must be rounded off to the number of places or figures specified for the requirement according to ANSI/ICEA S-84 - 608 - 1988, paragraph 1.3.
        (r) Manufacturing irregularities. (1) Repairs to the shield and/or armor are not permitted in cable supplied to end users under this section.
        (2) Minor defects in jackets (defects having a dimension of 3 millimeters (0.125 inch.) or less in any direction) may be repaired by means of heat fusing in accordance with good commercial practices utilizing sheath grade compounds.
        (s) Preparation for shipment. (1) The cable must be shipped on reels. The diameter of the drum must be large enough to prevent damage to the cable from reeling or unreeling. The reels must be substantial and so constructed as to prevent damage to the cable during shipment and handling.
        (2) The thermal wrap must comply with the requirements of ANSI/ICEA S-84 - 608 - 1988, paragraph 10.3. When a thermal reel wrap is supplied, the wrap must be applied to the reel and must be suitably secured in place to minimize thermal exposure to the cable during storage and shipment. The use of the thermal reel wrap as a means of reel protection will be at the option of the manufacturer unless specified by the end user.
        (3) The outer end of the cable must be securely fastened to the reel head so as to prevent the cable from becoming loose in transit. The inner end of the cable must be securely fastened in such a way as to make it readily available if required for electrical testing. Spikes, staples, or other fastening devices which penetrate the cable jacket must not be used. The method of fastening the cable ends must be acceptable to RUS and accepted prior to its use.
        (4) Each length of cable must be wound on a separate reel unless otherwise specified or agreed to by the purchaser.
        (5) The arbor hole must admit a spindle 63 millimeters (2.5 inches) in diameter without binding. Steel arbor hole liners may be used but must be accepted by RUS prior to their use.
        (6) Each reel must be plainly marked to indicate the direction in which it should be rolled to prevent loosening of the cable on the reel.
        (7) Each reel must be stenciled or labeled on either one or both sides with the information specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 10.4 and the RUS cable designation:
Cable Designation
BFCE
Cable Construction
Pair Count
Conductor Gauge
E = Expanded Insulation
A = Coated Aluminum Shield
C = Copper Shield
Y = Gopher Resistant Shield
X = Armored, Separate Shield
H = T1 Screened Cable
H1C = T1C Screened Cable
P = Preconnectorized
  Example: BFCEXH100 - 22
Buried Filled Cable, Expanded Insulation, Armored (w/separate shield), T1 Screened Cable, 100 pair, 22 AWG.
        (8) When cable manufactured to the requirements of this specification is shipped, both ends must be equipped with end caps acceptable to RUS.
        (9) When preconnectorized cables are shipped, the splicing modules must be protected to prevent damage during shipment and handling. The protection method must be acceptable to RUS and accepted prior to its use.
        (10) All cables ordered for use in underground duct applications must be equipped with a factory-installed pulling-eye on the outer end in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 10.5.2.
(The information and recordkeeping requirements of this section have been approved by the Office of Management and Budget (OMB) under the control number 0572 - 0059)
Appendix A to 7 CFR 1755.890 -- Qualification Test Methods
        (I) The test procedures described in this appendix are for qualification of initial cable designs and major modifications of accepted designs. Included in (V) of this appendix are suggested formats that may to be used in submitting test results to RUS.
        (II) Sample selection and preparation. (1) All testing must be performed on lengths removed sequentially from the same 25 pair, 22 gauge jacketed cable. This cable must not have been exposed to temperatures in excess of 38C since its initial cool down after sheathing. The lengths specified are minimum lengths and if desirable from a laboratory testing standpoint longer lengths may be used.
        (a) Length A must be 10 1B 0.2 meters (33 1B 0.5 feet) long and must be maintained at 23 1B 3C. One length is required.
        (b) Length B must be 12 1B 0.2 meters (40 1B 0.5 feet) long. Prepare the test sample by removing the jacket, shield or shield/armor, and core wrap for a sufficient distance on both ends to allow the insulated conductors to be flared out. Remove sufficient conductor insulation so that appropriate electrical test connections can be made at both ends. Coil the sample with a diameter of 15 to 20 times its sheath diameter. Three lengths are required.
        (c) Length C must be one meter (3 feet) long. Four lengths are required.
        (d) Length D must be 300 millimeters (1 foot) long. Four lengths are required.
        (e) Length E must be 600 millimeters (2 feet) long. Four lengths are required.
        (f) Length F must be 3 meters (10 feet) long and must be maintained at 23 1B 3C for the duration of the test. Two lengths are required.
        (2) Data reference temperature. Unless otherwise specified, all measurements must be made at 23 1B 3C.
        (III) Environmental tests -- (1) Heat aging test -- (a) Test samples. Place one sample each of lengths B, C, D, and E in an oven or environmental chamber. The ends of Sample B must exit from the chamber or oven for electrical tests. Securely seal the oven exit holes.
        (b) Sequence of tests. The samples are to be subjected to the following tests after conditioning:
        (i) Water Immersion Test outlined in (III)(2) of this appendix;
        (ii) Water Penetration Test outlined in (III)(3) of this appendix;
        (iii) Insulation Compression Test outlined in (III)(4) of this appendix; and
        (iv) Jacket Slip Strength Test outlined in (III)(5) of this appendix.
        (c) Initial Measurements. (i) For Sample B measure the open circuit capacitance for each odd numbered pair at 1, 150, and 772 kilohertz, and the attenuation at 150 and 772 kilohertz after conditioning the sample at the data reference temperature for 24 hours. Calculate the average and standard deviation for the data of the 13 pairs on a per kilometer or (on a per mile) basis.
        (ii) The attenuation at 150 and 772 kilohertz may be calculated from open circuit admittance (Yoc) and short circuit impedance (Zsc) or may be obtained by direct measurement of attenuation.
        (iii) Record on suggested formats in (V) of this appendix or on other easily readable formats.
        (d) Heat conditioning. (i) Immediately after completing the initial measurements, condition the sample for 14 days at a temperature of 65 1B 2C.
        (ii) At the end of this period note any exudation of cable filler. Measure and calculate the parameters given in (III)(1)(c) of this appendix. Record on suggested formats in (V) of this appendix or other easily readable formats.
        (iii) Cut away and discard a one meter (3 foot) section from each end of length B.
        (e) Overall electrical deviation. (i) Calculate the percent change in all average parameters between the final parameters after conditioning and the initial parameters in (III)(1)(c) of this appendix.
        (ii) The stability of the electrical parameters after completion of this test must be within the following prescribed limits:
        (A) Capacitance. The average mutual capacitance must be within 5 percent of its original value;
        (B) The change in average mutual capacitance must be less than 5 percent over frequency 1 to 150 kilohertz; and
        (C) Attenuation. The 150 and 772 kilohertz attenuation must not have increased by more than 5 percent over their original values.
        (2) Water immersion electrical test -- (a) Test sample selection. The 10 meter (33 foot) section of length B must be tested.
        (b) Test sample preparation. Prepare the sample by removing the jacket, shield or shield/armor, and core wrap for sufficient distance to allow one end to be accessed for test connections. Cut out a series of 6 millimeter (0.25 inch.) diameter holes along the test sample, at 30 centimeters (1 foot) intervals progressing successively 90 degrees around the circumference of the cable. Assure that the cable core is exposed at each hole by slitting the core wrapper. Place the prepared sample in a dry vessel which when filled will maintain a one meter (3 foot) head of water over 6 meters (20 feet) of uncoiled cable. Extend and fasten the ends of the cable so they will be above the water line and the pairs are rigidly held for the duration of the test.
        (c) Capacitance testing. Measure the initial values of mutual capacitance of all odd pairs in each cable at a frequency of 1 kilohertz before filling the vessel with water. Be sure the cable shield or shield/armor is grounded to the test equipment. Fill the vessels until there is a one meter (3 foot) head of water on the cables.
        (i) Remeasure the mutual capacitance after the cables have been submerged for 24 hours and again after 30 days.
        (ii) Record each sample separately on suggested formats attached or on other easily readable formats.
        (d) Overall electrical deviation. (i) Calculate the percent change in all average parameters between the final parameters after conditioning with the initial parameters in (III)(2)(c) of this appendix.
        (ii) The average mutual capacitance must be within 5 percent of its original value.
        (3) Water penetration testing. (a) A watertight closure must be placed over the jacket of length C. The closure must not be placed over the jacket so tightly that the flow of water through pre-existing voids of air spaces is restricted. The other end of the sample must remain open.
        (b) Test per Option A or Option B -- (i) Option A. Weigh the sample and closure prior to testing. Fill the closure with water and place under a continuous pressure of 10 1B 0.7 kilopascals (1.5 1B 0.1 pounds per square inch gauge) for one hour. Collect the water leakage from the end of the test sample during the test and weigh to the nearest 0.1 gram. Immediately after the one hour test, seal the ends of the cable with a thin layer of grease and remove all visible water from the closure, being careful not to remove water that penetrated into the core during the test. Reweigh the sample and determine the weight of water that penetrated into the core. The weight of water that penetrated into the core must not exceed 6 grams.
        (ii) Option B. Fill the closure with a 0.2 gram sodium fluorscein per liter water solution and apply a continuous pressure 10 1B 0.7 kilopascals (1.5 1B 0.1 pounds per square inch gauge) for one hour. Catch and weigh any water that leaks from the end of the cable during the one hour period. If no water leaks from the sample, carefully remove the water from the closure. Then carefully remove the jacket, shield or shield/ armor, and core wrap one at a time, examining with an ultraviolet light source for water penetration. After removal of the core wrap, carefully dissect the core and examine for water penetration within the core. Where water penetration is observed, measure the penetration distance. The distance of water penetration into the core must not exceed 127 millimeters (5.0 inches).
        (4) Insulation compression test -- (a) Test sample D. Remove jacket, shield or shield/armor, and core wrap being careful not to damage the conductor insulation. Remove one pair from the core and carefully separate, wipe off core filler and straighten the insulated conductors. Retwist the two insulated conductors together under sufficient tension to form 10 evenly spaced 360 degree twists in a length of 10 centimeters (4 inches).
        (b) Sample testing. Center the mid 50 millimeters (2 inches) of the twisted pair between 2 smooth rigid parallel metal plates that are 50 millimeters 0A 50 millimeters (2 inches 0A 2 inches). Apply a 1.5 volt direct current potential between the conductors, using a light or buzzer to indicate electrical contact between the conductors. Apply a constant load of 67 newtons (l5 pound-force) on the sample for one minute and monitor for evidence of contact between the conductors. Record results on suggested formats in (V) of this appendix or on other easily readable formats.
        (5) Jacket slip strength test -- (a) Sample selection. Test Sample E from (III)(1)(a) of this appendix.
        (b) Sample preparation. Prepare test sample in accordance with the procedures specified in ASTM D 4565 - 90a.
        (c) Sample conditioning and testing. Remove the sample from the tensile tester prior to testing and condition for one hour at 50 1B 2C. Test immediately in accordance with the procedures specified in ASTM D 4565 - 90a. A minimum jacket slip strength of 67 newtons (15 pound-force) is required. Record the highest load attained.
        (6) Humidity exposure. (a) Repeat steps (III)(1)(a) through (III)(1)(c)(iii) of this appendix for separate set of samples B, C, D, and E which have not been subjected to prior environmental conditioning.
        (b) Immediately after completing the measurements, expose the test sample to 100 temperature cyclings. Relative humidity within the chamber must be maintained at 90 1B 2 percent. One cycle consists of beginning at a stabilized chamber and test sample temperature of 52 1B 1C, increasing the temperature to 57 1B 1C, allowing the chamber and test samples to stabilize at this level, then dropping the temperature back to 52 1B 1C.
        (c) Repeat steps (III)(1)(d)(ii) through (III)(5)(c) of this appendix.
        (7) Temperature cycling. (a) Repeat steps (III)(1)(a) through (III)(1)(c)(iii) of this appendix for separate set of samples B, C, D, and E which have not been subjected to prior environmental conditioning.
        (b) Immediately after completing the measurements, subject the test sample to the 10 cycles of temperature between a minimum of 40C and +60C. The test sample must be held at each temperature extreme for a minimum of 1 1/2 hours during each cycle of temperature. The air within the temperature cycling chamber must be circulated throughout the duration of the cycling.
        (c) Repeat steps (III)(1)(d)(ii) through (III)(5)(c) of this appendix.
        (IV) Control sample -- (1) Test samples. A separate set of lengths A, C, D, E, and F must have been maintained at 23 1B 3C for at least 48 hours before the testing.
        (2) Repeat steps (III)(2) through (III)(5)(c) of this appendix except use length A instead of length B.
        (3) Surge test. (a) One length of sample F must be used to measure the breakdown between conductors while the other length of F must be used to measure the core to shield breakdown.
        (b) The samples must be capable of withstanding without damage, a single surge voltage of 15 kilovolts peak between conductors, and a 25 kilovolts peak surge voltage between conductors and the shield or shield/armor as hereinafter described. The surge voltage must be developed from a capacitor discharged through a forming resistor connected in parallel with the dielectric of the test sample. The surge generator constants must be such as to produce a surge of 1.5 0A 40 microsecond wave shape.
        (c) The shape of the generated wave must be determined at a reduced voltage by connecting an oscilloscope across the forming resistor with the cable sample connected in parallel with the forming resistor. The capacitor bank is charged to the test voltage and then discharged through the forming resistor and test sample. The test sample will be considered to have passed the test if there is no distinct change in the wave shape obtained with the initial reduced voltage compared to that obtained after the application of the test voltage.
        (V) The following suggested formats may be used in submitting the
(TABLE START)test results to RUS:
Environmental ConditioningXXXXXXX
Frequency 1 kilohertz
@h1Pair Number
@h1Capacitance@h2nF/km (nanofarad/mile)@h3Initial@h3Final
        1 .... XXXXXX .... XXXXXX
        3 .... XXXXXX .... XXXXXX
        5 .... XXXXXX .... XXXXXX
        7 .... XXXXXX .... XXXXXX
        9 .... XXXXXX .... XXXXXX
        11 .... XXXXXX .... XXXXXX
        13 .... XXXXXX .... XXXXXX
        15 .... XXXXXX .... XXXXXX
        17 .... XXXXXX .... XXXXXX
        19 .... XXXXXX .... XXXXXX
        21 .... XXXXXX .... XXXXXX
        23 .... XXXXXX .... XXXXXX
        25 .... XXXXXX .... XXXXXX
        Average xAE8 .... XXXXXX .... XXXXXX
Footnote: Overall Percent
(TABLE START)Difference in Average xAE8 XXXXXXX
(TABLE END)
Environmental ConditioningXXXXXXX
Frequency 150 kilohertz
@h1Pair Number
@h1Capacitance@h2nF/km (nanofarad/mile)@h3Initial@h3Final
@h1Attenuation@h2dB/km (decibel/mile)@h3Initial@h3Final
        1 .... XXX .... XXX .... XXX .... XXX
        3 .... XXX .... XXX .... XXX .... XXX
        5 .... XXX .... XXX .... XXX .... XXX
        7 .... XXX .... XXX .... XXX .... XXX
        9 .... XXX .... XXX .... XXX .... XXX
        11 .... XXX .... XXX .... XXX .... XXX
        13 .... XXX .... XXX .... XXX .... XXX
        15 .... XXX .... XXX .... XXX .... XXX
        17 .... XXX .... XXX .... XXX .... XXX
        19 .... XXX .... XXX .... XXX .... XXX
        21 .... XXX .... XXX .... XXX .... XXX
        23 .... XXX .... XXX .... XXX .... XXX
        25 .... XXX .... XXX .... XXX .... XXX
        Average xAE8 .... XXX .... XXX .... XXX .... XXX
Footnote: Overall Percent Difference in Average xAE8     Capacitance:XXXXXX
(TABLE START)Conductance:XXXXXX
(TABLE END)
Environmental ConditioningXXXXXXX
Frequency 772 kilohertz
@h1Pair Number
@h1Capacitance@h2nF/km (nanofarad/mile)@h3Initial@h3Final
@h1Attenuation@h2dB/km (decibel/mile)@h3Initial@h3Final
        1 .... XXX .... XXX .... XXX .... XXX
        3 .... XXX .... XXX .... XXX .... XXX
        5 .... XXX .... XXX .... XXX .... XXX
        7 .... XXX .... XXX .... XXX .... XXX
        9 .... XXX .... XXX .... XXX .... XXX
        11 .... XXX .... XXX .... XXX .... XXX
        13 .... XXX .... XXX .... XXX .... XXX
        15 .... XXX .... XXX .... XXX .... XXX
        17 .... XXX .... XXX .... XXX .... XXX
        19 .... XXX .... XXX .... XXX .... XXX
        21 .... XXX .... XXX .... XXX .... XXX
        23 .... XXX .... XXX .... XXX .... XXX
        25 .... XXX .... XXX .... XXX .... XXX
        Average xAE8 .... XXX .... XXX .... XXX .... XXX
Footnote: Overall Percent Difference in Average xAE8     Capacitance:XXXXXX
(TABLE START)Conductance:XXXXXX
(TABLE END)
Environmental ConditioningXXXXXXX
Water Immersion Test (1 kilohertz)
@h1Pair Number
@h1Capacitance@h2nF/km (nanofarad/mile)@h3Initial@h324 Hours@h3Final
        1 .... XXX .... XXX .... XXX
        3 .... XXX .... XXX .... XXX
        5 .... XXX .... XXX .... XXX
        7 .... XXX .... XXX .... XXX
        9 .... XXX .... XXX .... XXX
        11 .... XXX .... XXX .... XXX
        13 .... XXX .... XXX .... XXX
        15 .... XXX .... XXX .... XXX
        17 .... XXX .... XXX .... XXX
        19 .... XXX .... XXX .... XXX
        21 .... XXX .... XXX .... XXX
        23 .... XXX .... XXX .... XXX
        25 .... XXX .... XXX .... XXX
        Average xAE8 .... XXX .... XXX .... XXX
Footnote: Overall
(TABLE START)Percent Difference in Average xAE8 XXXXXXX
(TABLE END)
Water Penetration Test
@h1
@h1Option A@h2End Leakage grams@h2Weight Gain grams
@h1Option B@h2End Leakage grams@h2Penetration mm (in.)
Control@rn,s_
Heat Age@rn,s_
Humidity Exposure@rn,s_
(TABLE START)
Temperature Cycling@rn,s_
(TABLE END)
Insulation Compression
@h1
@h1Failures
Control .... XXXXXXXX
Heat Age .... XXXXXXXX
Humidity Exposure .... XXXXXXXX
Temperature Cycling .... XXXXXXXX
(TABLE END)
(TABLE START)
Jacket Slip Strength @ 50C
@h1
@h1Load in newtons (pound-force)
Control .... XXXXXXXX
Heat Age .... XXXXXXXX
Humidity Exposure .... XXXXXXXX
(TABLE START)
Temperature Cycling .... XXXXXXXX
(TABLE END)
Filler Exudation (grams)
@h1
@h1
Heat Age .... XXXXXXXX
Humidity Exposure .... XXXXXXXX
(TABLE START)
Temperature Cycling .... XXXXXXXX
(TABLE END)
Surge Test (kilovolts)
@h1
@h1
Conductor to Conductor .... XXXXXXXX
Shield to Conductors .... XXXXXXXX
(TABLE END)
[58 FR 29328, May 20, 1993, as amended at 60 FR 1711, Jan. 5, 1995]
_1755.900   RUS specification for filled fiber optic cables.
        (a) Scope. (1) This section covers the requirement for filled fiber optic cables intended for aerial installation either by attachment to a support strand or by an integrated self-supporting arrangement, for underground application by placement in a duct, or for buried installations either by trenching or by direct plowing.
        (i) The optical waveguides are glass fibers having directly-applied protective coatings, and are called ``fibers'', herein. These fibers may be assembled in either loose fiber bundles with a protective core tube, encased in several protective buffer tubes, or in tight buffer tubes.
        (ii) Fillers, strength members, core wraps, and bedding tapes may complete the cable core.
        (iii) The core or buffer tubes containing the fibers and the interstices between the buffer tubes, fillers, and strength members in the core structure are filled with a suitable material to exclude water.
        (iv) The cable structure is completed by an extruded overall plastic jacket. This jacket may have strength members embedded in it, in some designs.
        (v) Buried installation requires an armor under the outer jacket.
        (vi) For self-supporting cable the outer jacket may be extruded over the support messenger and cable core.
        (2) The cable is fully color coded so that each fiber is distinguishable from every other fiber. A basic color scheme of twenty-four colors allows individual fiber identification. Colored tubes, binders, threads, stripings, or markings provide fiber group identification.
        (3) Cable manufactured to this section must demonstrate compliance with the qualification testing requirements to ensure satisfactory end-use performance characteristics for the intended applications.
        (4) Optical cable designs not specifically addressed by this section may be allowed if accepted by RUS. Justification for acceptance of a modified design must be provided to substantiate product utility and long term stability and endurance.
        (5) All cables sold to RUS borrowers for projects involving RUS loan funds under this section must be accepted by RUS Technical Standards Committee ``A'' (Telephone). For cables manufactured to the specification of this section, all design changes to an accepted design must be submitted for acceptance. RUS will be the sole authority on what constitutes a design change.
        (6) The American National Standard Institute/Institute of Electrical and Electronics Engineers, Inc (ANSI/IEEE), 1993 National Electrical Safety Code (NESC) referenced in this section is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of ANSI/IEEE 1993 NESC are available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from IEEE Service Center, 445 Hoes Lane, Piscataway, NJ 08854, telephone number 1 (800) 678 - 4333.
        (7) American Society for Testing and Materials Specifications (ASTM) A 640 - 91, Standard Specification for Zinc-Coated Steel Strand for Messenger Support of Figure 8 Cable; ASTM B 736 - 92a, Standard Specification for Aluminum, Aluminum Alloy, and Aluminum-Clad Steel Cable Shielding Stock; ASTM D 1238 - 90b, Standard Test Method for Flow Rates of Thermoplastics by Extrusion Plastometer; ASTM D 1248 - 84 (1989), Standard Specification for Polyethylene Plastic Molding and Extrusion Materials, ASTM D 1535 - 89, Standard Test Method for Specifying Color by the Munsell System; ASTM D 3349 - 86, Standard Test Method for Absorption Coefficient of Carbon Black Pigmented Ethylene Plastic; ASTM D 4565 - 90a, Standard Test Methods for Physical and Environmental Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable; ASTM D 4566 - 90, Standard Test Methods for Electrical Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable; ASTM D 4568 - 86, Standard Test Methods for Evaluating Compatibility Between Cable Filling and Flooding Compounds and Polyolefin Cable Materials; and ASTM E 29 - 90, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications, referenced in this section are incorporated by reference by RUS. These incorporations by references were approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of ASTM standards are available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from ASTM, 1916 Race Street, Philadelphia, Pennsylvania 19103 - 1187, telephone number (215) 299 - 5585.
        (8) Electronic Industries Association Standards (EIA) - 455 - 20, Measurement of Change in Optical Transmittance; EIA - 455 - 41, Compressive Loading Resistance of Fiber Optic Cables; EIA - 455 - 86, Fiber Optic Cable Jacket Shrinkage; EIA - 455 - 89A, Fiber Optic Cable Jacket Elongation And Tensile Strength; and EIA - 455 - 174, Mode Field Diameter of Single-Mode Optical Fiber by Knife-Edge Scanning in the Far Field, referenced in this section are incorporated by reference by RUS. These incorporations by references were approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of EIA standards are available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from Global Engineering Documents, 15 Inverness Way East, Englewood, CO 80112, telephone number (303) 792 - 2181.
        (9) Electronic Industries Association/Telecommunications Industries Association Standards (EIA/TIA) - 455 - 25A, Repeated Impact Testing of Fiber Optic Cables and Cable Assemblies; EIA/TIA - 455 - 30B, Frequency Domain Measurement of Multimode Optical Fiber Information Transmission Capacity; EIA/TIA - 455 - 31B, Fiber Tensile Proof Test Method; EIA/TIA - 455 - 37A, Low or High Temperature Bend Test for Fiber Optic Cable; EIA/TIA - 455 - 45B, Method for Measuring Optical Fiber Geometry Using a Laboratory Microscope; EIA/TIA - 455 - 46A, Spectral Attenuation Measurement for Long-Length, Graded-Index Optical Fibers; EIA/TIA - 455 - 48B, Measurement of Optical Fiber Cladding Diameter Using Laser-Based Instruments; EIA/TIA - 455 - 51A, Pulse Distortion Measurement of Multimode Glass Optical Fiber Information Transmission Capacity; EIA/TIA - 455 - 53A, Attenuation by Substitution Measurement for Multimode Graded-Index Optical Fibers or Fiber Assemblies Used in Long Length Communications Systems; EIA/TIA - 455 - 55B, End-View Methods for Measuring Coating and Buffer Geometry of Optical Fibers; EIA/TIA - 455 - 58A, Core Diameter Measurement of Graded-Index Optical Fibers; EIA/TIA - 455 - 59, Measurement of Fiber Point Defects Using an OTDR; EIA/TIA - 455 - 61, Measurement of Fiber or Cable Attenuation Using an OTDR; EIA/TIA - 455 - 78A, Spectral-Attenuation Cutback Measurement for Single-Mode Optical Fibers; EIA/TIA - 455 - 81A, Compound Flow (Drip) Test for Filled Fiber Optic Cable; EIA/TIA - 455 - 82B, Fluid Penetration Test for Fluid-Blocked Fiber Optic Cable; EIA/TIA - 455 - 85A, Fiber Optic Cable Twist Test; EIA/TIA - 455 - 104A, Fiber Optic Cable Cyclic Flexing Test; EIA/TIA - 455 - 164A, Single-Mode Fiber, Measurement of Mode Field Diameter by Far-Field Scanning; EIA/TIA - 455 - 165A, Mode Field Diameter Measurement Near Field Scanning Technique; EIA/TIA - 455 - 167A, Mode Field Diameter, Variable Aperture in the Far Field; EIA/TIA - 455 - 168A, Chromatic Dispersion Measurement of Multimode Graded-Index and Single-Mode Optical Fibers by Spectral Group Delay Measurement in the Time Domain; EIA/TIA - 455 - 169A, Chromatic Dispersion Measurement of Single-Mode Optical Fibers by the Phase-Shift Method; EIA/TIA - 455 - 170, Cable Cutoff Wavelength of Single-Mode Fiber by Transmitted Power; EIA/TIA - 455 - 173, Coating Geometry Measurement for Optical Fiber Side-View Method; EIA/TIA - 455 - 175A, Chromatic Dispersion Measurement of Single-Mode Optical Fibers by the Differential Phase Shift Method; EIA/TIA - 455 - 176, Method for Measuring Optical Fiber Cross-Sectional Geometry by Automated Grey-Scale Analysis; EIA/TIA - 455 - 177A, Numerical Aperture Measurement of Graded-Index Optical Fibers; EIA/TIA - 455 - 178, Measurements of Strip Force Required for Mechanically Removing Coatings from Optical Fibers; and EIA/TIA - 598, Color Coding of Fiber Optic Cables, referenced in this section are incorporated by reference by RUS. These incorporations by references were approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of EIA/TIA standards are available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from Global Engineering Documents, 15 Inverness Way East, Englewood, CO 80112, telephone number (303) 792 - 2181.
        (10) RUS intends that the optical fibers contained in the cables manufactured in accordance with this section have characteristics that will allow signals, having a range of wavelengths, to be carried simultaneously.
        (b) Optical fibers. (1) The solid glass optical fibers must consist of a cylindrical core and cladding covered by either an ultraviolet-cured acrylate or other suitable coating.
        (2) The optical fiber types must be one of the following:
        (i) Dispersion-unshifted single mode fiber EIA Class IVa;
        (ii) Dispersion-shifted single mode fiber EIA Class IVb;
        (iii) 50/125 micrometer multimode fiber EIA Class Ia; or
        (iv) 62.5/125 micrometer multimode fiber EIA Class Ia.
        (3) The dispersion-unshifted single mode fiber core must have either a matched or depressed clad step refractive index profile with a mode-field diameter of 9.01B1.0 micrometers when measured at 1300 nanometers and 10.5+1.0 micrometers/1.5 micrometers when measured at 1550 nanometers in accordance with any one of the following test methods:
        (i) EIA/TIA - 455 - 164A;
        (ii) EIA/TIA - 455 - 165A;
        (iii) EIA/TIA - 455 - 167A; or
        (iv) EIA - 455 - 174.
        (4) The dispersion-shifted single mode fiber core must have either a segmented core design or depressed clad step refractive index profile with a mode-field diameter of 7.5+1.5 micrometers/1.3 micrometers when measured at 1550 nanometers in accordance with any one of the test procedures specified in paragraph (b)(3) of this section.
        (5) The core clad off-set of the dispersion-unshifted and dispersion-shifted single mode fibers must not be greater than 1.0 micrometer when measured in accordance with either EIA/TIA - 455 - 45B or EIA/TIA - 455 - 176.
        (6) The multimode fiber cores must have graded (parabolic) refractive index profiles with core diameters of 50.01B3.0 micrometers or 62.51B3.0 micrometers when measured in accordance with either EIA/TIA - 455 - 58A, or EIA/TIA - 455 - 176.
        (7) The core noncircularity of multimode fibers must not exceed 6 percent when measured in accordance with either EIA/TIA - 455 - 45B or EIA/TIA - 455 - 176.
        (8) The outside diameter of the glass fiber for both single mode and multimode fibers must be 1251B2.0 micrometers when measured in accordance with any one of the following test methods:
        (i) EIA/TIA - 455 - 45B;
        (ii) EIA/TIA - 455 - 176; or
        (iii) EIA/TIA - 455 - 48B, Methods A or B.
        (9) The outside diameter of the glass fiber must be nominally concentric with the fiber core as is consistent with the best commercial practice.
        (10) The individual fibers must be proof tested at a minimum tensile stress of 0.35 gigapascal for approximately one second when measured in accordance with EIA/TIA - 455 - 31B.
        (11) Factory splices of fibers are allowed provided that prior acceptance from RUS is obtained for the splice technique, that all splices are documented and reported to the customer and that the spliced fiber meets all requirements of this section.
        (12) The optical fiber must be coated with a suitable material to preserve the intrinsic strength of the glass having an outside diameter of 2501B15 micrometers when measured in accordance with either EIA/TIA - 455 - 55B or EIA/TIA - 455 - 173.
        (13) The maximum force required to remove 25 millimeters of protective fiber coating must not exceed 13 newtons when measured in accordance with EIA/TIA - 455 - 178.
        (14) All optical fibers in any single length of cable must be of the same type.
        (c) Buffer/coating. (1) The optical fibers contained in a tube buffer (loose tube), an inner jacket (unit core), a channel or otherwise loosely packaged must have a clearance between the fibers and the inside of the container sufficient to allow for thermal expansions without constraining the fibers. The protective container must be manufactured from a material having a coefficient of friction sufficiently low to allow the fibers free movement.
        (2) Optical fibers covered in near contact with an extrusion (tight tube) must have an intermediate soft buffer to allow for thermal expansions and minor pressures.
        (3) All protective coverings in any single length of cable must be continuous and be of the same material except at splice locations.
        (4) The protective coverings must be free from holes, splits, blisters, and other imperfections and must be as smooth and concentric as is consistent with the best commercial practice.
        (5) Repairs to the fiber coatings are not allowed except at splice locations.
        (6) Both loose tube and tight tube coverings of each color and other fiber package types removed from the finished cable must meet the following shrinkback and cold bend performance requirements. The fibers may be left in the tubes.
        (i) Shrinkback. Testing must be conducted in accordance with ASTM D 4565 - 90a, paragraph 14.1, using a talc bed at a temperature of 95 _C. Shrinkback must not exceed 5 percent of the original 150 millimeter length of the specimen. The total shrinkage of the specimen must be measured.
        (ii) Cold bend. Testing must be conducted on at least one tube from each color in the cable. Stabilize the specimen to 201B1 _C for a minimum of four hours. While holding the specimen and mandrel at the test temperature, wrap the tube in a tight helix ten times around a mandrel with a diameter not greater than five times the tube diameter. The tube must show no evidence of cracking when observed with normal or corrected-to-normal vision.
        Note: Channel cores and similar slotted single component core designs need not be tested for cold bend.
        (d) Fiber and buffer tube identification. (1) The colors designated for identification of loose buffer tubes, tight tube buffer fibers and individual fibers in multifiber tubes, slots or bundles are shown in the
(TABLE START)following table:
@h1Buffer tube and fiber No.
@h1Color
1 .... Blue.
2 .... Orange.
3 .... Green.
4 .... Brown.
5 .... Slate.
6 .... White.
7 .... Red.
8 .... Black.
9 .... Yellow.
10 .... Violet.
11 .... Rose.
12 .... Aqua.
13 .... Blue/Black Tracer.
14 .... Orange/Black Tracer.
15 .... Green/Black Tracer.
16 .... Brown/Black Tracer.
17 .... Slate/Black Tracer.
18 .... White/Black Tracer.
19 .... Red/Black Tracer.
20 .... Black/Yellow Tracer.
21 .... Yellow/Black Tracer.
22 .... Violet/Black Tracer.
23 .... Rose/Black Tracer.
24 .... Aqua/Black Tracer.
(TABLE END)
        (2) Standards of color. Except for the aqua color, the colors of fibers and tubes supplied in accordance with this section are specified in terms of the Munsell Color System (ASTM D 1535 - 89) and must comply with the color limits as defined in EIA/TIA - 598. (A visual color standard meeting these requirements and entitled ``Munsell Color Charts for Color Coding,'' may be obtained from the Munsell Color Company, Inc., 2441 North Calvert Street, Baltimore, Maryland 21218. The latest edition of the color standard should be used.)
        (i) The aqua color limits using the Munsell Color System must be
(TABLE START)as follows:
Munsell Notation
@h1Symbol
@h1Aqua color
Centroid .... 10BG 7/6
H++ .... 5B 7/6
H .... 5BG 7/6
V++ .... 10BG 8/4
V .... 10BG 6/6
C++ .... None
C .... 10BG 7/4
(TABLE END)
        (ii) Other coloring schemes used for providing identification of buffer tubes and optical fibers which deviate from the requirements of paragraph (d)(1) of this section will not be accepted by RUS.
        (e) Strength members. (1) Strength members must be an integral part of the cable construction, but are not considered part of the support messenger for self-supporting optical cable.
        (2) The combined strength of all the strength members must be sufficient to support the stress of installation and to protect the cable in service.
        (3) Strength members may be incorporated into the core as a central support member or filler, as fillers between the fiber packages, as an annular serving over the core, as an annular serving over the intermediate jacket, embedded in the outer jacket or as a combination of any of these methods.
        (4) The central support member or filler must contain no more than one splice per kilometer of cable. Individual fillers placed between the fiber packages and placed as annular servings over the core must contain no more than one splice per kilometer of cable. Cable sections having central member or filler splices must meet the same physical requirements as unspliced cable sections.
        (5) Strength member materials and splicing techniques must be accepted by RUS prior to their use.
        (6) In each length of completed cable having a metallic central member, the dielectric strength between the armor and the metallic center member must withstand at least 15 kilovolts direct current for 3 seconds.
        (f) Forming the cable core. (1) Protected fibers must be assembled with the optional central support member, fillers and strength members in such a way as to form a cylindrical group.
        (2) The standard cylindrical group or core designs shall consist of 4, 6, 8, 10, 12, 16, 18, 20, or 24 fibers. Cylindrical groups or core designs larger than the sizes shown above must meet all the requirements of this section.
        (3) When threads or tapes are used as core binders, they must be colored either white or natural and must be a nonhygroscopic and nonwicking dielectric material.
        (4) When threads or tapes are used as unit binders to define optical fiber units in loose tube, tight tube, slotted, or bundled cored designs, they must be colored in accordance with the table listed below and must be a nonhygroscopic and nonwicking dielectric material or be rendered such by the filling compound. The colors of the binders must be in accordance
(TABLE START)with paragraphs (d)(2) introductory text and (d)(2)(i) of this section.
@h1Unit No.
@h1Binder color
1 .... Blue.
2 .... Orange.
3 .... Green.
4 .... Brown.
5 .... Slate.
6 .... White.
7 .... Red.
8 .... Black.
9 .... Yellow.
10 .... Violet.
11 .... Rose.
12 .... Aqua.
13 .... Blue-Black.
14 .... Orange-Black.
15 .... Green-Black.
16 .... Brown-Black.
17 .... Slate-Black.
18 .... White-Black.
19 .... Red-Black.
20 .... Black-Black-Yellow.
21 .... Yellow-Yellow-Black.
22 .... Violet-Black.
23 .... Rose-Black.
24 .... Aqua-Black.
(TABLE END)
        (g) Filling compound. (1) To prevent the ingress of water into the core, a filling compound must be applied into the interior of the loose fiber tubes and into the interstices of the core. When a core wrap is used, the filling compound must also be applied to the core wrap, over the core wrap and between the core wrap and inner jacket when required.
        (2) The materials must be homogeneous and uniformly mixed; free from dirt, metallic particles and other foreign matter; easily removed; nontoxic and present no dermal hazards.
        (3) The individual cable manufacturer must satisfy RUS that the filling compound selected for use is suitable for its intended application. The filling compound must be compatible with the cable components when tested in accordance with ASTM D 4568 - 86 at a temperature of 80_ C.
        (h) Core wrap (optional). (1) At the option of the manufacturer, one or more layers of nonhygroscopic and nonwicking dielectric material may be applied over the core.
        (2) The core wrap(s) can be used to provide a heat barrier to prevent deformation or adhesion between the fiber tubes or can be used to contain the core.
        (3) When core wraps are used, sufficient filling compound must be applied to the core wraps so that voids or air spaces existing between the core wraps and between the core the inner side of the core wrap are minimized.
        (i) Inner jacket. (1) Inner jackets may be applied directly over the core or over the strength members.
        (i) For armored cable an inner jacket is optional but recommended. The inner jacket may absorb stresses in the cable core that may be introduced by armor application or by armored cable installation.
        (ii) For unarmored cable an inner jacket is optional.
        (2) The inner jacket material and test requirements must be as for the outer jacket material per paragraphs (m)(3) introductory text through (m)(3)(v) of this section, except that either black or natural polyethylene may be used. In the case of natural polyethylene, the requirements for absorption coefficient and the inclusion of furnace black are waived.
        (j) Flooding compound. (1) Sufficient flooding compound must be applied between the inner jacket and armor and between the armor and outer jacket so that voids and air spaces in these areas are minimized. The use of floodant between the armor and outer jacket is not required when uniform bonding, per paragraph (k)(10) of this section, is achieved between the plastic-clad armor and the outer jacket.
        (2) The flooding compound must be compatible with the jacket when tested in accordance with ASTM D 4568 - 86 at a temperature of 80_ C. The floodant must exhibit adhesive properties sufficient to prevent jacket slip when tested in accordance with the requirements of appendix A, paragraph (III)(3), of this section.
        (3) The individual cable manufacturer must satisfy RUS that the flooding compound selected for use is acceptable for the application.
        (4) In lieu of a flooding compound, water blocking tapes may be applied between the inner jacket and armor and between the armor and outer jacket to prevent water migration. The use of the water blocking tape between the armor and outer jacket is not required when uniform bonding, per paragraph (k)(10) of this section, is achieved between the plastic-clad armor and the outer jacket.
        (k) Armor. (1) A steel armor, plastic coated on both sides, is required for direct buried cable manufactured under the provisions of this section. An armor is optional for duct and aerial cable as required by the purchaser. The plastic coated steel armor must be applied longitudinally directly over the core wrap or the intermediate jacket and have a minimum overlap of 3.0 millimeters.
        (2) The uncoated steel tape must be electrolytic chrome coated steel (ECCS) with a thickness of 0.155 1B 0.015 millimeters.
        (3) The reduction in thickness of the armoring material due to the corrugating or to the application process must be kept to a minimum and must not exceed 10 percent at any spot.
        (4) The armor of each length of cable must be electrically continuous with no more than one joint or splice allowed per kilometer of cable. This requirement does not apply to a joint or splice made in the raw material by the raw material manufacturer.
        (5) The breaking strength of any section of an armor tape, containing a factory splice joint, must not be less than 80 percent of the breaking strength of an adjacent section of the armor of equal length without a joint.
        (6) For cables containing no floodant over the armor, the overlap portions of the armor tape must be bonded in cables having a flat, noncorrugated armor to meet the requirements of paragraphs (q)(1) through (q)(7)(ii) of this section. If the tape is corrugated, the overlap portions of the armor tape must be sufficiently bonded and the corrugations must be sufficiently in register to meet the requirements of paragraphs (q)(1) through (q)(7)(ii) of this section.
        (7) The armor tape must be so applied as to enable the cable to pass the bend test as specified in paragraph (q)(1) of this section.
        (8) The protective coating on the steel armor must meet the Bonding-to-Metal, Heat Sealability, Lap-Shear and Moisture Resistance requirements of Type I, Class 2 coated metals in accordance with ASTM B 736 - 92a.
        (9) The ability of the plastic-clad metal to resist the flooding compound must be determined as required by ASTM D 4568 - 86 using a one meter length of coated steel which must be aged for 7 days at 681B1 _C. There must be no delamination of the coating from the steel at the conclusion of the test.
        (10) When the jacket is bonded to the plastic coated armor, the bond between the plastic coated armor and the outer jacket must not be less than 525 newtons per meter over at least 90 percent of the cable circumference when tested in accordance with ASTM D 4565 - 90a. For cables with strength members embedded in the jacket, and residing directly over the armor, the area of the armor directly under the strength member is excluded from the 90 percent calculation.
        (l) Optional support messenger (aerial cable). (1) When a self-supporting aerial cable containing an integrated support messenger is supplied, the support messenger must comply with the requirements specified in paragraphs (l)(2) introductory text through (l)(6) of this section.
        (2) The fully flooded, stranded support messenger must be 6.35 millimeters diameter, 7 wire, extra high strength grade, Class A galvanized steel strand conforming to ASTM A 640 - 91 with exceptions and additional provisions as follows:
        (i) The maximum lay of the individual wires of the strand must be 140 millimeters.
        (ii) Any section of a completed strand containing a joint must have minimum tensile strength and elongation of 29,500 newtons and 3.5 percent, respectively, when tested in accordance with the procedures specified ASTM A 640 - 91.
        (iii) The individual wires from a completed strand which contain joints must not fracture when tested according to the ``Ductility of Steel'' procedures specified in ASTM A 640 - 91 except that the mandrel diameter must be equal to 5 times the nominal diameter of the individual wires.
        (3) The support strand must be completely covered with a corrosion protective floodant. The floodant must be homogeneous and uniformly mixed.
        (4) The floodant must be nontoxic and present no dermal hazard.
        (5) The floodant must be free from dirt, metallic particles, and other foreign matter that may interfere with the performance of the cable.
        (6) The floodant must be compatible with the polyethylene outer jacket and must be acceptable to RUS.
        (7) Other methods of providing self-supporting cable specifically not addressed in this section may be allowed if accepted by RUS. Justification for acceptance of a modified design must be provided to substantiate product utility and long term stability and endurance.
        (m) Outer jacket. (1) The outer jacket must provide the cable with a tough, flexible, protective covering which can withstand exposure to sunlight, to atmosphere temperatures and to stresses reasonably expected in normal installation and service.
        (2) The jacket must be free from holes, splits, blisters, or other imperfections and shall be as smooth and concentric as is consistent with the best commercial practice.
        (3) The raw material used for the outer jacket must be one of the five types listed in paragraphs (m)(3)(i) through (m)(3)(v) of this section. The raw material must contain an antioxidant to provide long term stabilization and the materials must contain a 2.601B0.25 percent concentration of furnace black to provide ultraviolet shielding. Both the antioxidant and furnace black must be compounded into the material by the raw material supplier.
        (i) Low density, high molecular weight polyethylene (LDHMW) must conform to the requirements of ASTM D 1248 - 84(1989), Type I, Class C, Category 4 or 5, Grade J3.
        (ii) Low density, high molecular weight ethylene copolymer (LDHMW) must conform to the requirements of ASTM D 1248 - 84(1989), Type I, Class C, Category 4 or 5, Grade J3.
        (iii) Linear low density, high molecular weight polyethylene (LLDHMW) must conform to the requirements of ASTM D 1248 - 84(1989), Type I, Class C, Category 4 or 5, Grade J3.
        (iv) High density polyethylene (HD) must conform to the requirements of ASTM D 1248 - 84(1989), Type III, Class C, Category 4 or 5, Grade J4.
        (v) Medium density polyethylene (MD) must conform to the requirements of ASTM D 1248 - 84(1989), Type II, Class C, Category 4 or 5, Grade J4.
        (vi) Particle size of the carbon selected for use must not average greater than 20 nanometers.
        (vii) Absorption coefficient must be a minimum of 400 in accordance with the procedures of ASTM D 3349 - 86.
        (4) The outer jacketing material removed from or tested on the
(TABLE START)cable must be capable of meeting the following performance requirements:
@h1Property
@h1LLDHMW,ethylenecopolymer
@h1LDHMWpolyethylene
@h1HD or MDpolyethylene
Melt Flow Rate:
Percent increase from raw material, Maximum  ....   .... 50  .... 50
<0.41 (Initial Melt Index)  .... 100  ....    ....
0.41 - 2.00 (Initial Melt Index)  ....    .... 50  ....
Tensile Strength:
Minimum, Megapascals  .... 12  .... 12  .... 16.5
Ultimate Elongation:
Minimum, Percent  .... 400  .... 400  .... 300
Environmental Stress Cracking:
Maximum, Failures  .... 0/10  .... 2/10  .... 2/10
Shrinkback:
Maximum, Percent  .... 5  .... 5  .... 5
Impact:
Maximum, Failures  .... 2/10  .... 2/10  .... 2/10
(TABLE END)
        (5) Testing procedures. The procedures for testing jacket specimens for compliance with paragraph (m)(4) of this section must be as follows:
        (i) Melt flow rate. The melt flow rate must be determined by ASTM D 1238 - 90b, Condition E. Jacketing material must be free from flooding and filling compound.
        (ii) Tensile strength and ultimate elongation. Test in accordance with EIA - 455 - 89A, using a jaw separation speed of 500 millimeters per minute for low density material and 50 millimeters per minute for high and medium density materials.
        (iii) Environmental stress cracking. Test in accordance with ASTM D 4565 - 90a.
        (iv) Shrinkback. Test in accordance with the procedures specified in EIA - 455 - 86 using a temperature of 100 1B 1_ C for a 4 hour period for low density material and a test temperature of 115 1B 1_ C for a 4 hour period for high and medium density materials.
        (v) Impact. The test must be performed in accordance with ASTM D 4565 - 90a using an impact force of 4 newton-meters at a temperature of 20 1B 2_ C. A cracked or split jacket constitutes failure.
        (6) Jacket thickness. The nominal outer jacket thickness must not be less than 1.3 millimeters. The test method used must either be the End Sample Method (paragraph (m)(6)(i) of this section) or the Continuous Uniformity Thickness Gauge Method (paragraph (m)(6)(ii) of this section).
        (i) End sample method. The jacket must be capable of meeting the following requirements:
Minimum Average Thickness: 90 percent (%) of nominal thickness
Minimum Spot Thickness: 70 % of nominal thickness
        (ii) Continuous uniformity thickness gauge. (A) The jacket must be capable of meeting the following requirements:
Minimum Average Thickness: 75 % of nominal thickness
Minimum Thickness: 70 % of nominal thickness
Maximum Eccentricity: 40 % of nominal thickness
E:\PICKUP\ER05JY94.000
        (B) The maximum and minimum thickness values shall be based on the average of each axial section.
        (7) For jackets having embedded strength members, the jacket thickness must meet the requirements of paragraph (m)(6) of this section except that the jacket thickness over the strength members must not be less than 0.50 millimeters.
        (8) The minimum jacket thickness at any point over the support messenger for self-supporting aerial cable utilizing such an element must be 1.1 millimeters.
        (9) The web dimension for self-supporting aerial cable utilizing such a feature must be as follows:
E:\PICKUP\ER05JY94.001
        (n) Sheath slitting cord (optional). (1) A sheath slitting cord is optional.
        (2) When a sheath slitting cord is used it must be nonhygroscopic and nonwicking or be rendered such by the filling or flooding compound, continuous throughout a length of cable and of sufficient strength to open the sheath over at least a one meter length without breaking the cord at a temperature of 231B5 _C.
        (o) Identification marker and length marker. (1) Each length of cable must be permanently labeled either Optical Cable, OC, Optical Fiber Cable, or OF on the outer jacket and identified as to manufacturer and year of manufacture.
        (2) Each length of cable intended for direct burial installation shall be marked with a telephone handset in compliance with Rule 350G of the 1993 National Electrical Safety Code (NESC).
        (3) Mark the number of fibers on the jacket.
        (4) The markings must be printed on the jacket at regular intervals of not more than 2 meters.
        (5) An alternative method of marking may be used if acceptable to RUS.
        (6) The completed cable must have sequentially numbered length markers in Meters or Feet at regular intervals of not more than 2 meters along the outside of the jacket.
        (7) Continuous sequential numbering must be employed in a single length of cable.
        (8) The numbers must be dimensioned and spaced to produce good legibility and must be approximately 3 millimeters in height. An occasional illegible marking is permissible if there is a legible marking located not more than 2 meters from it.
        (9) The method of marking must be by means of suitable surface markings producing a clear distinguishable contrasting marking acceptable to RUS. Where direct or transverse printing is employed, the characters should be indented to produce greater durability of marking. Any other method of length marking must be acceptable to RUS as producing a marker suitable for the field. Size, shape and spacing of numbers, durability and overall legibility of the marker will be considered in acceptance of the method.
        (10) Agreement between the actual length of the cable and the length marking on the cable jacket must be within the limits of +1 percent, 0 percent.
        (11) The color of the initial marking must be white or silver. If the initial marking fails to meet the requirements of the preceding paragraphs, it will be permissible to either remove the defective marking and re-mark with the white or silver color or leave the defective marking on the cable and re-mark with yellow. No further re-marking is permitted. Any re-marking must be on a different portion of the cable circumference than any existing marking when possible and have a numbering sequence differing from any other existing marking by at least 3,000.
        (12) Any reel of cable that contains more than one set of sequential markings must be labeled to indicate the color and sequence of marking to be used. The labeling must be applied to the reel and also to the cable.
        (p) Optical performance. (1) The optical performance of the single mode fibers must be in accordance with the requirements specified in paragraphs (p)(1)(i) through (p)(1)(viii) of this section.
        (i) The attenuation values of the single mode fibers within the cable must not exceed 0.5 decibel per kilometer (dB/km) for dispersion-unshifted single mode fiber at 1310 and 1550 nanometers and must not exceed 0.5 dB/km for dispersion-shifted single mode fiber at 1550 nanometers. The test method used for measuring the attenuation must be in accordance with either:
        (A) EIA/TIA - 455 - 78A; or
        (B) EIA/TIA - 455 - 61.
        (ii) The attenuation values for wavelengths between 1285 and 1330 nanometers and between 1525 and 1575 nanometers for dispersion-unshifted fibers must not exceed the attenuation at 1310 and 1550 nanometers by more than 0.1 dB/km. The attenuation values for wavelengths between 1525 and 1575 nanometers for dispersion-shifted fibers must not exceed the attenuation at 1550 nanometers by more than 0.1 dB/km. The test method used for measuring the attenuation must be in accordance with any one of the methods specified in paragraph (p)(1)(i) of this section.
        (iii) Attenuation discontinuities in the fiber's length must not exceed 0.1 decibel (dB) for dispersion-unshifted fiber at 13101B20 and 15501B20 nanometers and must not exceed 0.1 dB for dispersion-shifted fiber at 15501B20 nanometers when measured in accordance with EIA/TIA - 455 - 59.
        (iv) Measurement of the attenuation must be conducted at the wavelength specified for application and must be expressed in decibels per kilometer.
        (v) Because the accuracy of attenuation measurements for single mode fibers becomes questionable when measured on short cable lengths, attenuation measurements are to be made utilizing characterization cable lengths. If the ship length of cable is less than one kilometer, the attenuation values measured on longer lengths of cable (characterization length of cable) before cutting to the ship lengths of cable may be applied to the ship lengths.
        (vi) For dispersion-unshifted fiber the zero dispersion wavelength must be between 1300 and 1322 nanometers, and the value of the dispersion slope at the zero-dispersion wavelength must not be greater than 0.092 picosecond per nanometer squared times kilometer (ps/(nm2_km) when measured in accordance with either:
        (A) EIA/TIA - 455 - 168A;
        (B) EIA/TIA - 455 - 169A; or
        (C) EIA/TIA - 455 - 175A.
        (vii) For dispersion-shifted fiber, the dispersion over the wavelength range between 1525 and 1575 nanometers must not exceed 3.5 picosecond per nanometer times kilometer (ps/(nm_km)) and must have a maximum dispersion slope of 0.095 ps/(nm2_km) at the zero dispersion wavelength when measured in accordance with any one of the test procedures specified in paragraph (p)(1)(vi) of this section.
        (viii) The cut off wavelength of the dispersion-unshifted and the dispersion-shifted fibers in a cable must be less than 1260 nanometers when measured in accordance with EIA/TIA - 455 - 170.
        (2) The optical performance of the multimode fibers must be in accordance with the requirements specified in paragraphs (p)(2)(i) through (p)(2)(vi) of this section.
        (i) The attenuation values of the 50/125 and 62.5/125 micrometer multimode fibers within the cable must not exceed 1.5 dB/km at 1300 nanometers when measured in accordance with either:
        (A) EIA/TIA - 455 - 46A;
        (B) EIA/TIA - 455 - 53A; or
        (C) EIA/TIA - 455 - 61.
        (ii) Attenuation discontinuities in the fiber's length must not exceed 0.2 dB for both multimode fiber types at 13001B20 nanometers when measured in accordance with EIA/TIA - 455 - 59.
        (iii) Measurement of the attenuation must be conducted at the wavelength specified for application and must be expressed in decibels per kilometer.
        (iv) Because the accuracy of attenuation measurements for multimode fibers becomes questionable when measured on short cable lengths, attenuation measurements are to be made utilizing characterization cable lengths. If the ship length of cable is less than one kilometer, the attenuation values measured on longer lengths of cable (characterization length of cable) before cutting to the ship lengths of cable may be applied to the ship lengths.
        (v) The bandwidth of the multimode fibers at the 3 dB optical power of the optical fibers within the cable must be within the limits prescribed in the purchase order.
        (vi) The test methods used to measure bandwidth must be in accordance with either EIA/TIA - 455 - 30B or EIA/TIA - 455 - 51A.
        (3) Numerical aperture (NA) for each multimode optical fiber in the cable must be 0.201B0.015 for the 50/125 micrometer design and 0.2751B0.015 for the 62.5/125 micrometer design when measured in accordance with EIA/TIA - 455 - 177A.
        (q) Mechanical requirements -- (1) Cable bend test. (i) All cables manufactured in accordance with the requirements of this section must be capable of meeting the following bend test without exhibiting an increase in fiber attenuation greater than 0.10 dB for single mode fibers and 0.40 dB for multimode fibers.
        (ii) Measure the attenuation of dispersion-unshifted single mode fibers at 13101B20 and 15501B20 nanometers, dispersion-shifted single mode fibers at 15501B20 nanometers and multimode fibers at 13001B20 nanometers.
        (iii) After measuring the attenuation of the optical fibers, test the cable sample in accordance with EIA/TIA - 455 - 37A, Test Condition E, Turns Test Level 3. The following detailed test conditions shall apply:
        (A) Section 4.2 -- Mandrel diameter must be 20 times the cable diameter.
        (B) Section 4.5 -- Measure the attenuation increase of the wound sample at the test temperature and specified wavelengths in accordance with EIA - 455 - 20.
        (C) For armored cable, the armor overlap must be on the outside of the bend.
        (D) For self-supporting cable, the jacketed support messenger and connection web must be removed prior to testing.
        (iv) The cable may be allowed to warm to room temperature before visual inspection. The bent area of the cable must show neither visible evidence of fracture of the jacket nor delamination of the bond at the overlap and to the outer jacket in nonflooded cable. After removal of the jacket, there must be no visible evidence of fracture of the armor, when present, and of the components in the core.
        (2) Cable impact test. (i) All cables manufactured in accordance with the requirements of this section must be capable of meeting the following impact test without exhibiting an increase in fiber attenuation greater than 0.10 dB for single mode fibers and 0.40 dB for multimode fibers, and without cracking or splitting of the cable jacket.
        (ii) Measure the attenuation of the optical fibers in accordance with paragraph (q)(1)(ii) of this section.
        (iii) After measuring the attenuation of the optical fibers, test the cable in accordance with EIA/TIA - 455 - 25A.
        (3) Cable compression test. (i) All cables manufactured in accordance with the requirements of this section must be capable of meeting the following compressive strength test without exhibiting an increase in fiber attenuation greater than 0.10 dB for single mode fibers and 0.4 dB for multimode and without cracking or splitting of the cable jacket when subjected to a minimum compressive load of 440 newtons per centimeter for armored cable and 220 newtons per centimeter for nonarmored cable.
        (ii) Measure the attenuation of the optical fibers in accordance with paragraph (q)(1)(ii) of this section.
        (iii) After measuring the attenuation of the optical fibers, test the cable in accordance with EIA - 455 - 41 using a rate of 3 millimeters to 20 millimeters per minute and maintaining the load for 10 minutes.
        (4) Cable twist test. (i) All cables manufactured in accordance with the requirements of this section must be capable of meeting the following twist test without exhibiting an increase in fiber attenuation greater than 0.10 dB for single mode fibers and 0.40 dB for multimode fibers, and without cracking or splitting of the cable jacket.
        (ii) Measure the attenuation of the optical fibers in accordance with paragraph (q)(1)(ii) of this section.
        (iii) After measuring the attenuation of the optical fibers, test the cable in accordance with EIA/TIA - 455 - 85A, using a maximum cable twisting length of 4 meters.
        (5) Cable flex test. (i) All cables manufactured in accordance with the requirements of this section must be capable of meeting the following flex test without exhibiting an increase in fiber attenuation greater than 0.10 dB for single mode fibers and 0.40 dB for multimode fibers.
        (ii) Measure the attenuation of the optical fibers in accordance with paragraph (q)(1)(ii) of this section.
        (iii) After measuring the attenuation of the optical fibers, test the cable in accordance with EIA/TIA - 455 - 104A, Test Conditions I and II, flexed for 25 cycles using a sheave diameter not less than 20 times the cable diameter (Test condition letter B).
        (iv) After completion of the test, the bent area of the cable must show neither visible evidence of fracture of the jacket nor delamination of the bond at the overlap and to the outer jacket in nonflooded cable. After removal of the jacket, there must be no visible evidence of fracture of the armor, when present, and of the components in the core.
        (6) Water penetration test. (i) A one meter length of completed fiber optic cable must be preconditioned for 24 hours at 231B5 _C and then tested in accordance with EIA/TIA - 455 - 82B using a one meter water head over the sample or placed under the equivalent continuous pressure for one hour.
        (ii) After the one hour period, there must be no water leakage through the sheath interfaces, under the core wrap, between the cable core interstices or through the fiber buffers.
        (iii) If water leakage is detected in the first sample, one additional 3 meter sample from EACH END of the same reel must be tested in accordance with paragraph (q)(6)(i) of this section. If either sample exhibits water leakage, the entire reel of cable is to be rejected. If the samples exhibit no leakage, the entire reel of cable is considered acceptable.
        (7) Compound flow test. (i) Three 300 millimeter long test samples must be preconditioned for 24 hours at 231B5 _C and then tested in accordance with EIA/TIA - 455 - 81A using a test temperature of 80 1B 1 _C.
        (ii) The amount of filling or flooding compounds that flowed or dripped from any of the suspended cable specimens must be less than or equal to 0.5 grams of material. The measurement of an amount greater than 0.5 grams for any of the suspended cable specimens constitutes failure.
        (r) Preconnectorized cable (optional). (1) At the option of the manufacturer and upon request by the purchaser, the cable may be factory terminated with connectors acceptable to RUS.
        (2) All connectors must be accepted by RUS prior to their use.
        (s) Acceptance testing and extent of testing. (1) The tests described in appendix A of this section are intended for acceptance of cable designs and major modifications of accepted designs. What constitutes a major modification is at the discretion of RUS. These tests are intended to show the inherent capability of the manufacturer to produce cable products that have satisfactory performance characteristics, long life and long-term optical stability but are not intended as field tests.
        (2) For initial acceptance, the manufacturer must submit:
        (i) An original signature certification that the product fully complies with each section of the specification;
         (ii) Qualification Test Data, per appendix A of this section;
         (iii) A set of instructions for handling the cable;
         (iv) OSHA Material Safety Data Sheets for all components;
         (v) Agree to periodic plant inspections;
         (vi) A certification that the product does or does not comply with the domestic origin manufacturing provisions, of the ``Buy American'' requirements of the Rural Electrification Act of 1938 (52 Stat. 818);
         (vii) Written user testimonials concerning field performance of the product; and
         (viii) Other nonproprietary data deemed necessary by the Chief, Outside Plant Branch (Telephone).
         (3) For requalification acceptance, the manufacturer must submit an original signature certification that the product fully complies with each section of the specification, excluding the Qualification Section, and a certification that the product does or does not comply with the domestic origin manufacturing provisions of the ``Buy American'' requirements of the Rural Electrification Act of 1938 (52 Stat. 818), for acceptance by September 30 every three years. The required data and certification must have been gathered within 90 days of the submission.
         (4) Initial and requalification acceptance requests should be addressed to: Chairman, Technical Standards Committee ``A'' (Telephone), Telecommunications Standards Division, Rural Utilities Service, Washington, DC 20250 - 1500.
         (5) Tests on 100 percent of completed cable. (i) The armor for each length of cable must be tested for continuity using the procedures of ASTM D 4566 - 90.
         (ii) Attenuation for each optical fiber in the cable must be measured.
         (iii) Optical discontinuities must be isolated and their location and amplitude recorded.
         (6) Capability tests. Tests on a quality assurance basis must be made as frequently as is required for each manufacturer to determine and maintain compliance with:
         (i) Numerical aperture and bandwidth of multimode fibers;
         (ii) Cut off wavelength of single mode fibers;
         (iii) Dispersion of single mode fibers;
         (iv) Shrinkback and cold testing of loose tube and tight tube buffers;
         (v) Adhesion properties of the protective fiber coating;
         (vi) Dielectric strength between the armor and the metallic central member;
         (vii) Performance requirements for the inner and outer jacketing materials;
         (viii) Performance requirements for the filling and flooding compounds;
         (ix) Bonding properties of the coated armoring material;
         (x) Sequential marking and lettering;
         (xi) Cable bend and cable impact tests;
         (xii) Water penetration and compound flow tests;
         (xiii) Cable twist, cable flex, and cable compression tests; and
         (xiv) Performance requirements of support messenger.
         (t) Records of optical and physical tests. (1) Each manufacturer must maintain suitable summary records for a period of at least 3 years of all optical and physical tests required on completed cable by this section as set forth in paragraphs (s)(5) and (s)(6) of this section. The test data for a particular reel must be in a form that it may be readily available to RUS upon request. The optical data must be furnished to the purchaser on a suitable and easily readable form.
         (2) Measurements and computed values must be rounded off to the number of places or figures specified for the requirement according to ASTM E 29 - 90.
         (u) Manufacturing irregularities. (1) Repairs to the armor, when present, are not permitted in cable supplied to end users under this section.
         (2) Minor defects in the inner and outer jacket (defects having a dimension of 3 millimeter or less in any direction) may be repaired by means of heat fusing in accordance with good commercial practices utilizing sheath grade compounds.
         (3) Buffer tube repair is permitted only in conjunction with fiber splicing.
         (v) Packaging and preparation for shipment. (1) The cable must be shipped on reels. The diameter of the drum must be large enough to prevent damage to the cable from reeling and unreeling. The reels must be substantial and so constructed as to prevent damage during shipment and handling.
         (2) A circumferential thermal wrap or other means of protection complying with the requirements of appendix B of this section must be secured between the outer edges of the reel flange to protect the cable against damage during storage and shipment.
         (3) Cable manufactured to the requirements of this section must be sealed at the ends to prevent entrance of moisture. The method of sealing must be accepted by RUS prior to its use.
         (4) The end-of-pull (outer end) of the cable must be securely fastened to prevent the cable from coming loose during transit. The start-of-pull (inner end) of the cable must project through a slot in the flange of the reel, around an inner riser, or into a recess on the reel flange near the drum and fastened in such a way to prevent the cable from becoming loose during installation.
         (5) Spikes, staples or other fastening devices must be used in a manner which will not result in penetration of the cable.
         (6) The arbor hole must admit a spindle 63.5 millimeters in diameter without binding. Steel arbor hole liners may be used but must be accepted by RUS prior to their use.
         (7) Each reel must be plainly marked to indicate the direction in which it should be rolled to prevent loosening of the cable on the reel.
         (8) Each reel must be stenciled or lettered with the name of the manufacturer.
         (9) The following information must be either stenciled on the reel or on a tag firmly attached to the reel:
Optical Cable
Number of Fibers
Armored or Nonarmored
Year of Manufacture
Name of Cable Manufacturer
Length of Cable
Reel Number
RUS 7 CFR 1755.900
Example:
Optical Cable
4 fiber
Armored
1988
XYZ Company
1050 meters
 Reel Number 3
RUS 7 CFR 1755.900
         (10) When preconnectorized cable is shipped, the splicing modules must be protected to prevent damage during shipment and handling. The protection method must be accepted by RUS prior to its use.
(The information collection and recordkeeping requirements of this section have been approved by the Office of Management and Budget (OMB) under control number 0572 - 0059)
Appendix A to 7 CFR 1755.900 -- Qualification Tests Methods
        (I) The test procedures described in this appendix are for qualification of initial cable designs and major modifications of accepted designs. Included in (V) of this appendix are suggested formats that may be used in submitting test results to RUS.
        (II) Sample selection and preparation. (1) All testing must be performed on lengths removed sequentially from any of the same cables listed below. The cables must not have been exposed to temperatures in excess of 38_C since their initial cool downs after sheathing. The lengths specified are minimum lengths and if desirable from a laboratory testing standpoint longer lengths may be used:
        (a) 12 single mode fiber jacketed cable consisting of 6 single mode dispersion-unshifted fibers and 6 single mode dispersion-shifted fibers.
        (b) 12 multimode fiber jacketed cable consisting of 6 50/125 micrometer multimode fibers and 6 62.5/125 micrometer multimode fibers.
        (c) 24 fiber jacketed combination cable consisting of 6 single mode dispersion-unshifted fibers; 6 single mode dispersion-shifted fibers; 6 50/125 micrometer multimode fibers; and 6 62.5/125 micrometer multimode fibers.
        (2) Length A shall be a minimum of 500 meters long. Coil the sample with a diameter of 50 to 75 times its sheath diameter. Three lengths are required if only requesting acceptance for either single mode fiber cable (a), multimode fiber cable (b), or using the combination fiber cable (c). Six lengths, 3 lengths of single mode fiber cable (a), and 3 lengths of multimode fiber cable (b), are required if requesting acceptance for both single mode and multimode fiber cables.
        (3) Length B shall be one meter long. Four lengths of either single mode fiber cable (a), multimode fiber cable (b) or the combination fiber cable (c) are required.
        (4) Length C shall be 600 millimeters long. Four lengths of either single mode fiber cable (a), multimode fiber cable (b) or the combination fiber cable (c) are required.
        (5) Data reference temperature. Unless otherwise specified, all measurement shall be made at 231B5_C.
        (III) Environmental tests -- (1) Heat aging test. (a) Test samples. Place one or two samples of length A and one sample each of lengths B and C in an oven or environmental chamber. The ends of sample A must exit from the chamber or oven for optical tests. Securely seal the oven exit holes.
        (b) Sequence of tests. The samples are to be subjected to the following tests after conditioning:
        (i) Water Penetration Test outlined in paragraph (III ) (2) of this appendix; and
        (ii) Jacket Slip Strength Test outlined in paragraph (III) (3) of this appendix. (For Flooded Designs Only)
        (c) Initial measurements. (i) For sample(s) A measure the attenuation for the single mode dispersion-unshifted fibers at 1310 and 1550 nanometers, for single mode dispersion-shifted fibers at 1550 nanometers and/or for multimode fibers at 1300 nanometers at a temperature of 231B5_C. Also measure the bandwidth of the multimode fibers. Calculate the attenuation data on a per kilometer basis. Calculate the bandwidth data on a megahertz-kilometer (MHz-km) basis.
        (ii) Record on suggested formats in (V) of this appendix or on other easily readable formats.
        (d) Heat conditioning. (i) Immediately after completing the initial measurements, condition the sample(s) for 14 days at a temperature of 651B2_C.
        (ii) At the end of this period note any exudation of cable filler. Measure the parameters given in paragraph (III)(1)(c) of this appendix. Record on suggested formats in (V) of this appendix or on other easily readable formats.
        (e) Overall optical deviation. (i) Calculate the change in all parameters between the final parameters after conditioning with initial parameters in paragraph (III)(1)(c) of this appendix.
        (ii) The stability of the optical parameters after completion of this test must be within the following prescribed limits:
        (A) Attenuation. The attenuation of each multimode fiber must not change by more than 0.3 db/km and the attenuation of each single mode fiber must not change by more than 0.1 dB/km.
        (B) Bandwidth. The bandwidth of each multimode fiber must not change by more than 15 percent from their original values.
        (2) Water penetration testing. (a) A watertight closure must be placed over the jacket of length B from paragraph (III)(1)(a) of this appendix. The closure must not be placed over the jacket so tightly that the flow of water through pre-existing voids or air spaces is restricted. The other end of the sample must remain open.
        (b) Test per Option A or Option B. (i) Option A. Weigh the sample and closure prior to testing. Fill the closure with water and place under a continuous pressure of 10 1B 0.7 kilopascals for one hour. Collect the water leakage from the end of the test sample during the test and weigh to the nearest 0.1 gram. Immediately after the one hour test, seal the ends of the cable with a thin layer of grease and remove all visible water from the closure, being careful not to remove water that penetrated into the core during the test. Reweigh the sample and determine the weight of water that penetrated into the core.
        (ii) Option B. Fill the closure with a 0.2 gram sodium fluorscein per liter water solution and apply a continuous pressure of 10 1B 0.7 kilopascals for one hour. Catch and weigh any water that leaks from the end of the cable during the one hour period. If no water leaks from the sample, carefully remove the water from the closure. Then carefully remove the outer jacket, armor, if present, inner jacket, if present, and core wrap one at a time, examining with an ultraviolet light source for water penetration. After removal of the core wrap, carefully dissect the core and examine for water penetration within the core. Where water penetration is observed, measure the penetration distance.
        (3) Jacket slip strength test. (For Flooded Design Only) (a) Sample selection. Test sample C from paragraph (III)(1)(a) of this appendix.
        (b) Sample preparation. Prepare test sample in accordance with the procedures specified in ASTM D 4565 - 90a.
        (c) Sample conditioning and testing. Remove the sample from the tensile tester prior to testing and condition for one hour at 50 1B 2_C. Test immediately in accordance with the procedures specified in ASTM D 4565 - 90a. A minimum jacket slip strength of 67 newtons is required. Record the load attained on the suggested formats in (V) of this appendix or on other easily readable formats.
        (4) Temperature and humidity exposure. (a) Repeat paragraphs (III)(1)(a) through (III)(1)(c)(ii) of this appendix for separate set of samples A, B and C which have not been subjected to prior environmental conditioning.
        (b) Immediately after completing the measurements, expose the test sample to 100 temperature cyclings. Relative humidity within the chamber shall be maintained at 90 1B 2 percent. One cycle consists of beginning at a stabilized chamber and test sample temperature of 52 1B 2_C, increasing the temperature to 57 1B 2_C, allowing the chamber and test samples to stabilize at this level, then dropping the temperature back to 52 1B 2_C.
        (c) Repeat paragraphs (III)(1)(d)(ii) through (III)(3)(c) of this appendix.
        (5) Temperature cycling. (a) Repeat paragraphs (III)(1)(a) through (III)(1)(c)(ii) of this appendix for separate set of samples A, B, and C which have not been subjected to prior environmental conditioning.
        (b) Immediately after completing the measurements, subject the test sample to 10 cycles of temperature between 40_C and +60_C. The test sample must be held at each temperature extreme for a minimum of 1\1/2\ hours during each cycle of temperature. The air within the temperature cycling chamber must be circulated throughout the duration of the cycling.
        (c) Repeat paragraphs (III)(1)(d)(ii) through (III)(3)(c) of this appendix.
        (IV) Control sample -- (a) Test samples. A separate set of lengths B and C must have been maintained at 23 1B 5_C for at least 48 hours before the testing.
        (b) Repeat paragraphs (III)(2) through (III)(3)(c) of this appendix for these samples.
        (V) The following suggested formats may be used in submitting the
(TABLE START)test results to RUS:
Heat Aging Test -- Single Mode Cable
@h1Fiber No.
@h1Attenuation -- 1310 nm dB/km @h2Initial @h2Final @h2Change
@h1Attenuation -- 1550 nm dB/km @h2Initial @h2Final @h2Change
        1 @rs_
        2 @rs_
        3 @rs_
        4 @rs_
        5 @rs_
        6 @rs_
        7 @rs_
        8 @rs_
        9 @rs_
        10 @rs_
        11 @rs_
(TABLE START)
        12
(TABLE END)
Heat Aging Test -- Multimode Cable
@h1Fiber No.
@h1Attenuation -- 1300 nm dB/km @h2Initial @h2Final @h2Change
@h1Bandwidth dB/km @h2Initial @h2Final @h2Change (%)
        1 @rs_
        2 @rs_
        3 @rs_
        4 @rs_
        5 @rs_
        6 @rs_
        7 @rs_
        8 @rs_
        9 @rs_
        10 @rs_
        11 @rs_
(TABLE START)
        12
(TABLE END)
Heat Aging Test -- Combination Cable
@h1Fiber No.
@h1Attenuation -- 1310 nm dB/km@h2Initial @h2Final @h2Change
@h1Attenuation -- 1550 nm dB/km @h2Initial @h2Final @h2Change
@h1Bandwidth MHz-km @h2Initial @h2Final @h2Change (%)
1@rs_
2@rs_
3@rs_
4@rs_
5@rs_
6@rs_
7@rs_
8@rs_
9@rs_
10@rs_
11@rs_
12@rs_
13@rs_
14@rs_
15@rs_
16@rs_
17@rs_
18@rs_
19@rs_
20@rs_
21@rs_
22@rs_
23@rs_
(TABLE START)
24
(TABLE END)
Temperature/Humidity Test -- Single Mode Cable
@h1Fiber No.
@h1Attenuation -- 1310 nm dB/km@h2Initial @h2Final @h2Change
@h1Attenuation -- 1550 nm dB/km @h2Initial @h2Final @h2Change
        1@rs_
        2@rs_
        3@rs_
        4@rs_
        5@rs_
        6@rs_
        7@rs_
        8@rs_
        9@rs_
        10@rs_
        11@rs_
(TABLE START)
        12
(TABLE END)
Temperature/Humidity Test -- Multimode Cable
@h1Fiber No.
@h1Attenuation -- 1300 nm dB/km@h2Initial @h2Final @h2Change
@h1Bandwidth MHz-km @h2Initial @h2Final @h2Change
        1@rs_
        2@rs_
        3@rs_
        4@rs_
        5@rs_
        6@rs_
        7@rs_
        8@rs_
        9@rs_
        10@rs_
        11@rs_
(TABLE START)
        12
(TABLE END)
Temperature/Humidity Test -- Combination Cable
@h1Fiber No.
@h1Attenuation -- 1310 nmdB/km @h2Initial @h2Final @h2Change
@h1Attenuation -- 1550 nm dB/km@h2Initial @h2Final @h2Change
@h1Bandwidth MHz-km@h2Initial @h2Final @h2Change (%)
1@rs_
2@rs_
3@rs_
4@rs_
5@rs_
6@rs_
7@rs_
8@rs_
9@rs_
10@rs_
11@rs_
12@rs_
13@rs_
14@rs_
15@rs_
16@rs_
17@rs_
18@rs_
19@rs_
20@rs_
21@rs_
22@rs_
23@rs_
(TABLE START)
        24
(TABLE END)
Temperature Cycling Test -- Single Mode Cable
@h1Fiber No.
@h1Attenuation -- 1310 nm dB/km@h2Initial @h2Final @h2Change
@h1Attenuation -- 1550 nm dB/km @h2Initial @h2Final @h2Change
        1@rs_
        2@rs_
        3@rs_
        4@rs_
        5@rs_
        6@rs_
        7@rs_
        8@rs_
        9@rs_
        10@rs_
        11@rs_
(TABLE START)
        12
(TABLE END)
Temperature Cycling -- Multimode Cable
@h1Fiber No.
@h1Attenuation -- 1300 nm dB/km @h2Initial@h2Final@h2Change
@h1Bandwidth MHz - km@h2Initial @h2Final @h2Change (%)
        1@rs_
        2@rs_
        3@rs_
        4@rs_
        5@rs_
        6@rs_
        7@rs_
        8@rs_
        9@rs_
        10@rs_
        11@rs_
(TABLE START)
        12
(TABLE END)
Temperature Cycling Test Combination Cable
@h1Fiber No.
@h1Attenuation -- 1310 nmdB/km@h2Initial@h2Final@h2Change
@h1Attenuation -- 1550 nm dB/km @h2Initial @h2Final @h2Change
@h1Bandwidth MHz-km@h2Initial@h2Final@h2Change (%)
1@rs_
2@rs_
3@rs_
4@rs_
5@rs_
6@rs_
7@rs_
8@rs_
9@rs_
10@rs_
11@rs_
12@rs_
13@rs_
14@rs_
15@rs_
16@rs_
17@rs_
18@rs_
19@rs_
20@rs_
21@rs_
22@rs_
23@rs_
(TABLE START)
24
(TABLE END)
Water Penetration Test
@h1
@h1Option A@h2End leakage grams@h2Weight gain grams
@h1Option B@h2End leakage grams@h2Penetration millimeters
Control  ....    ....    ....    ....
Heat Age  ....    ....    ....    ....
Humidity Exposure  ....    ....    ....    ....
(TABLE START)
Temperature Cycling ....    ....    ....    ....
(TABLE END)
Jacket Slip Strength @ 50_C
@h1
@h1
   .... @oi0Load in Newtons
Control  ....
Heat Age  ....
Humidity Exposure  ....
Temperature Cycling  ....
   .... @oi0Filler Exudation (grams)
Heat Age  ....
Humidity Exposure  ....
Temperature Cycle  ....
(TABLE END)
Appendix B to 7 CFR 1755.900 -- Thermal Reel Wrap Qualification
        (I) The test procedures described in this appendix are only for qualification of initial and subsequent changes in thermal reel wraps.
        (II) Sample selection.  All testing must be performed on two 450 millimeter lengths of cable removed sequentially from the same fiber jacketed cable. This cable must not have been exposed to temperatures in excess of 38 _C since its initial cool down after sheathing.
        (III) Test procedure. (1) Place the two samples on an insulating material such as wood.
        (2) Tape thermocouples to the jackets of each sample to measure the jacket temperature.
        (3) Cover one sample with the thermal reel wrap.
        (4) Expose the samples to a radiant heat source capable of heating the uncovered jacket sample to a minimum of 71 _C. A GE 600 watt photoflood lamp or an equivalent lamp having the light spectrum approximately that of the sun shall be used.
        (5) The height of the lamp above the jacket shall be 380 millimeters or an equivalent height that produces the 71 _C jacket temperature on the unwrapped sample shall be used.
        (6) After the samples have stabilized at the temperature, the jacket temperatures of the samples shall be recorded after one hour of exposure to the heat source.
        (7) Compute the temperature difference between jackets.
        (8) For the thermal reel wrap to be acceptable to RUS, the temperature difference between the jacket with the thermal reel wrap and the jacket without the reel wrap shall be greater than or equal to 17 _C.
[59 FR 34360, July 5, 1994; 59 FR 44795, Aug. 30, 1994, as amended at 60 FR 1711, Jan. 5, 1995]
_1755.910   RUS specification for outside plant housings and serving area interface systems.
        (a) Scope. (1) The purpose of this specification is to inform manufacturers and users of outside plant housings and serving area interface (SAI) systems of the engineering and technical requirements that are considered necessary for satisfactory performance in outside plant environments. Included are the mechanical, electrical, and environmental requirements, desired design features, and test methods for evaluation of the product.
        (2) The housing and terminal requirements reflect the best engineering judgment available at the present time and may be subject to change due to advances in technology, economic conditions, or other factors. _
        (3) The test procedures described in this section are required by RUS to demonstrate the functional reliability of the product. However, other standard or unique test procedures may serve the same function. In such cases, RUS shall evaluate the test procedures and results on an individual basis.
        (4) The test procedures specified herein satisfy the requirements of housings as well as the requirements of terminals that may be installed within housings. Some of the requirements are interrelated to several tests designed to determine the performance aspects of terminals and are directly affected by testing required for housings. Therefore, the manufacturer should carefully review all the test requirements in order to develop a testing schedule that is comprehensive, efficient in terms of the number of test specimens required and can be accomplished in an orderly and logical sequence.
        (5) The specified tests may require special facilities to comply with Federal, State, or local regulatory requirements. Some test procedures are potentially hazardous to personnel because of the high voltages and mechanical forces involved. Safety precautions are necessary to prevent injury.
        (6) Underwriters Laboratories, Inc. (UL) 94, Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, fourth edition, dated June 18, 1991, referenced in this section is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. A copy of the UL standard is available for inspection during normal business hours at RUS, room 2845 - S, U.S. Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from UL Inc., 333 Pfingsten Road, Northbrook, Illinois 60062 - 2096, telephone number (708) 272 - 8800.
        (7) The American Society for Testing and Materials Specifications (ASTM) A 109 - 91, Standard Specification for Steel, Strip, Carbon, Cold-Rolled; ASTM A 153 - 82 (Reapproved 1987), Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware; ASTM A 366/A 366M - 91, Standard Specification for Steel, Sheet, Carbon, Cold-Rolled, Commercial Quality; ASTM A 525 - 91b, Standard Specification for General Requirements for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process; ASTM A 526/A 526M - 90, Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process, Commercial Quality; ASTM A 569/A 569M - 91a, Standard Specification for Steel, Carbon (0.15 Maximum, Percent), Hot-Rolled Sheet and Strip Commercial Quality; ASTM A 621/A 621M - 92, Standard Specification for Steel, Sheet and Strip, Carbon, Hot-Rolled, Drawing Quality; ASTM B 117 - 90, Standard Test Method of Salt Spray (Fog) Testing; ASTM B 539 - 90, Standard Test Methods for Measuring Contact Resistance of Electrical Connections (Static Contacts); ASTM B 633 - 85, Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel; ASTM D 523 - 89, Standard Test Method for Specular Gloss; ASTM D 610 - 85 (Reapproved 1989), Standard Test Method for Evaluating Degree of Rusting on Painted Steel Surfaces; ASTM D 822 - 89, Standard Practice for Conducting Tests on Paint and Related Coatings and Materials using Filtered Open-Flame Carbon-Arc Light and Water Exposure Apparatus; ASTM D 1535 - 89, Standard Test Method for Specifying Color by the Munsell System; ASTM D 1654 - 92, Standard Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments; ASTM D 1693 - 70 (Reapproved 1988), Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics; ASTM D 2197 - 86 (Reapproved 1991), Standard Test Method for Adhesion of Organic Coatings by Scrape Adhesion; ASTM D 2247 - 92, Standard Practice for Testing Water Resistance of Coatings in 100% Relative Humidity; ASTM D 2565 - 92, Standard Practice for Operating Xenon Arc-Type Light-Exposure Apparatus With and Without Water for Exposure of Plastics; ASTM D 2794 - 92, Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact); ASTM D 3928 - 89, Standard Test Method for Evaluation of Gloss or Sheen Uniformity; ASTM D 4568 - 86, Standard Test Methods for Evaluating Compatibility Between Cable Filling and Flooding Compounds and Polyolefin Cable Materials; ASTM G 21 - 90, Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi; and ASTM G 23 - 90, Standard Practice for Operating Light-Exposure Apparatus (Carbon-Arc Type) With and Without Water for Exposure of Nonmetallic Materials, referenced in this section are incorporated by reference by RUS. These incorporations by references were approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 7 CFR part 51. Copies of the ASTM standards are available for inspection during normal business hours at RUS, room 2845 - S, U.S. Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from ASTM, 1916 Race Street, Philadelphia, Pennsylvania 19103 - 1187, telephone number (215) 299 - 5585.
        (b) General information. (1) Outside plant housings are fabricated of either metallic or nonmetallic materials in different sizes and configurations to suit a variety of applications. The purpose of a housing is to protect its contents from environmental elements, rodents, insects, or vandalism and unauthorized access. Housings are designed with internal brackets for accommodating splicing, bonding and grounding connections, cable terminals, cross-connect facilities, load coils, and optical and electronic equipment.
        (2) Pedestals are housings primarily intended to house, organize, and protect cable terminations incorporating terminal blocks, splice connectors and modules, ground lugs and load coils. Activities typically performed in a pedestal are cable splicing, shield bonding and grounding, inductive loading, and connection of subscriber drops.
        (3) Serving area interface (SAI) cabinets are housings intended to perform some of the same functions as pedestals but are primarily intended to serve as the connecting terminal between feeder cable and distribution cables.
        (4) Outside plant housings shall be manufactured in accordance with National Electrical Code (NEC) requirements, Underwriters' Laboratories (UL) requirements, Department of Labor, Occupational Safety and Health Administration Standards (OSHA), and all other applicable Federal, State, and local requirements including, but not limited to, statutes, rules, regulations, orders, or ordinances otherwise imposed by law.
        (c) General documentation requirements -- (1) Installation and maintenance instructions. (i) Each product shall have available a set of instructions designed to provide sufficient information for the successful installation of the housing, cables, auxiliary equipment, and the associated splice preparation. The instructions shall be of sufficient size to be easily read and shall be printed using waterproof ink. Pedestal instruction sheets shall include a list of miscellaneous replacement parts that may be purchased locally. SAI systems shall be supplied with complete instructions for installation and use.
        (ii) When requested by RUS, or an RUS borrower, the manufacturer shall prepare a training package for the purpose of training technicians in the use and installation of the product and its auxiliary equipment.
        (iii) The manufacturer shall provide ordering information for repair parts. Repair parts shall be obtainable through a local distributor or shall be easily obtainable. Information describing equivalent parts and their sources should be provided for those parts that may also be obtained from other sources.
        (2) Quality assurance. The manufacturer shall demonstrate the existence of an ongoing quality assurance program that includes controls, procedures, and standards used for vendor certification, source inspection, incoming inspection, manufacture, in process testing, calibration and maintenance of tools and test equipment, final product inspection and testing, periodic qualification testing and control of nonconforming materials and products. The manufacturer shall maintain quality assurance records for five years.
        (3) RUS acceptance applications. (i) The tests described in this specification are required for acceptance of product designs and major modifications of accepted designs. All modifications shall be considered major unless otherwise declared by RUS. The tests are intended to show the inherent capability of the manufacturer to produce products which have an expected service life of 30 years.
        (ii) For initial acceptance the manufacturer shall:
        (A) Submit an original signature certification that the product complies with each section of the specification;
        (B) Provide qualification test data;
        (C) Provide OSHA Material Safety Data Sheets for the product;
        (D) Provide a detailed explanation concerning the intended use and capacity of the product;
        (E) Provide a complete set of instructions, recommendations for equipment organization and splicing;
        (F) Agree to periodic plant inspections;
        (G) Provide a certification that the product does or does not comply with the domestic origin manufacturing provisions of the ``Buy American'' requirements of the Rural Electrification Act of 1938 (52 Stat. 818);
        (H) Provide user testimonials concerning field performance of the product;
        (I) Provide product samples if requested by RUS; and
        (J) Provide any other data required by the Chief, Outside Plant Branch (Telephone).
        (iii) Each requirement of this section must be addressed in submissions for acceptance. The designation N/A may be entered when the requirements do not apply.
        (iv) Acceptance requests should be addressed to: Chairman, Technical Standards, Committee ``A'' (Telephone), Telecommunications Standards Division, Rural Utilities Service, Washington, DC 20250 - 1500.
        (d) Functional design criteria for housings -- (1) General requirements. (i) The functional requirements for housings concern materials, finishes, environmental factors, and design features that are applicable to most above ground housings used in the outside plant.
        (ii) Housings shall be of sufficient size to permit easily managed installation, operational, testing, and maintenance operations. The general shape of outside plant housings is usually comparable to that of a rectangular column or cylinder, with the shape of any particular housing being left to the manufacturer's discretion. Each design is subject to acceptance by RUS.
        (2) Housing types and capacities. (i) Housings used in outside plant are either the smaller housings generally known as pedestals or larger housings known as equipment or splice cabinets. Both categories may have designs intended for stake mounting, pole mounting, or pad mounting.
        (ii) The classifications of pedestals are the general purpose channel Type (H) and the dome Type (M). The Type H pedestal has either front only access or back and front access while the Type M pedestal has top only
(TABLE START)access. Pedestals are further designated as follows:
@h1Stake mounted
@h1Type
@h1Pole mounted
@h1Pole mounted (extra high)
BD3  .... H  .... BD3A
BD4  .... H  .... BD4A
BD5  .... H  .... BD5A
BD7  .... H  .... BD7A
BD14 .... M  .... BD14A  .... BD14AG
BD15 .... M  .... BD15A  .... BD15AG
BD16 .... M  .... BD16A  .... BD16AG
(TABLE END)
        (iii) The minimum volume associated with the pedestal designations
(TABLE START)shall be as shown in the following table:
@h1Pedestal\1\ housing designation
@h1Minimum volume @h2Cubic centimeters cm\3\ @h2(Cubic Inches) (in.\3\)
BD3, BD3A \2\  .... 9,000  .... (550)
BD4, BD4A\2\  .... 15,000  .... (900)
BD5, BD5A\2\  .... 35,000  .... (2,100)
BD7(\2\)  .... 72,000  .... (4,400)
BD14, BD14A, BD14AG\3\  .... 9,000  .... (550)
BD15, BD15A, BD15AG\3\  .... 27,000  .... (1,600)
BD16, BD16A, BD16AG\3\  .... 38,000  .... (2,300)
Footnote: Note 1: Housings designed for unique purposes will be evaluated on a case-by-case basis.
Footnote: Note 2: For Type H pedestals, the minimum volume is that space as measured 5 centimeters (cm) (2 inches (in.)) below the top of the housing to a point 40 cm (16 in.) above the bottom of the lower cover plate.
Footnote: Note 3: The minimum volume of the Type M pedestals shall be the space within the dome measured from the lower edge of the dome to a point 5 cm (2 in.) from the top.
(TABLE END)
        (iv) Equipment cabinets intended for use as SAI housings shall be assigned size designations according to their maximum pair termination capacities. The capacity will vary depending on the type of terminating equipment used. SAI cabinets shall be suffix designated with an ``A'' for pole mounting, ``X'' for pad mounting, and ``S'' for stake mounting.
        (v) Large pair count splice cabinets are classified according to their splice capacity. Approximately 48 cm\3\ (3.0 in.\3\) of splice area per pair straight spliced shall be permitted.
        (vi) The minimum volume associated with large pair count splice
(TABLE START)cabinets shall be as shown in the following table:
@h1Splice cabinet\1\ designation
@h1Minimum volume@h2(cm.\3\)@h2(in.\3\)
@h1Maximum splice capacity (pairs)
BD6000  .... 295,000  .... (18,000)  .... 6,000
BD8000  .... 393,000  .... (24,000)  .... 8,000
BD10000  .... 491,000  .... (30,000) .... 10,000
Footnote: Note 1: Additional sizes of splice cabinets shall be considered by RUS on a case-by-case basis.
(TABLE END)
        (3) Design and fabrication requirements for housings. (i) Type H pedestal housings may consist of an enclosed channel incorporating an integrally mounted stake that serves as a backplate, or they may be designed for universal mounting on stakes or poles. The body of the housing shall have two major components; an upper cover and a base cover. The upper cover shall have a top, front and back plate with the front cover removable to permit entry and provide increased work space. The base cover shall consist of a front plate and back plate. The base cover back plate may be an extension of the upper back plate cover.
        (ii) Type M pedestal housings shall consist of a one piece upper sleeve designed to fit over the base cover trapping air to prohibit water from entering the splice area when installed in locations prone to temporary flooding. Pedestals designed to be mounted extra high on poles for locations susceptible to deep snow shall have a bottom close-off option available to prohibit the ingress of birds, rodents and insects.
        (iii) The external housing components on all outside plant housings shall provide reasonable protection against accidental removal or vandalism. Housings shall be equipped with a cover plate retaining bolt and cup washer that may be opened only with an industry accepted socket type can wrench. Housings may be equipped with provisions to allow the purchaser to install a padlock.
        (iv) Installed housings shall resist the disassembling force of frost heaving applied to the bottom of ground line cover plates. The base cover must remain stationary to stabilize the contents of the housing cavity.
        (v) In an effort to provide protection against dust penetration, blowing snow, rain, and ultraviolet light degradation of internal components, all mechanical gaps shall be restricted. The use of seals, overlaps, gaskets, and/or dovetailing is required to assure satisfactory protection of housed equipment.
        (vi) Knockouts, cutouts, or notches designed to accommodate aerial service drops shall not be permitted. A design option for housings intended to accommodate service drops shall include a separate channel or equivalent in the base cover to allow future additions of service drops without the removal of gravel or the moisture barrier in the base of the housing. Service wire channels must be designed to prevent the entry of birds, reptiles, rodents and insects.
        (vii) Minimal venting of SAI housings may be necessary to relieve internal pressure and condensation.
        (viii) There shall be no aluminum housing components that will become buried in the soil when the housing is properly installed.
        (ix) Housing components may be assembled using rivets, welds, glue, bolts and nuts, or other techniques suitable for the materials involved.
        (x) Housings and their components that require field assembly must be capable of being assembled with tools normally available to outside plant technicians.
        (xi) Hinged doors on SAI housings and large pair count splice housings shall be equipped with a device that restrains the doors in the open position.
        (xii) Outside plant housings shall be free of sharp edges, burrs, etc., that could present a safety hazard to personnel involved in installation and use of the product or to the general public. Surfaces inside housings must not allow pinching of conductors during installation of cover plates or the opening and closing of doors.
        (xiii) A ground line mark shall be provided, approximately 15 cm (6 in.) below the top edge of the housing base cover plate on housings intended for ground level mounting. Base cover plates shall have a minimum height of 31 cm (12 in.).
        (xiv) Any housing, which weighs in excess of 91 kilograms (kg) (200 pounds (lb)), including its contents, shall be equipped with lifting brackets for attaching hoisting cables or chains.
        (xv) Housing stakes shall be a minimum of 107 cm (42 in.) in length. If fabricated from steel, they shall have a minimum thickness of No. 13 gauge as measured according to American Society for Testing and Materials (ASTM) A 525 - 91b. Stakes shall be formed into a ``U'' channel with a minimum depth of 2 cm (0.75 in.). The stake shall be a single part of suitable design strength for driving 91 cm (36 in.) into the soil with hand tools without damage such as bending or warping. The stake shall have adequate mounting holes having a minimum separation of 15 cm (6 in.) for mounting the housing baseplate. The stake material must resist corrosion and deterioration when exposed to soil and atmospheric conditions.
        (xvi) The housing design must permit a logical progression of installation steps that would normally be encountered in typical field installations.
        (xvii) Provisions for attaching housings to stakes, poles, walls, other housings, or pads shall be provided for each design intended for those purposes. Locations of holes for mounting attachments may be provided by knockouts on above ground components. Mounting hole locations for below ground components may be predrilled.
        (xviii) Pole mounting hardware shall provide at least 1.3 cm (0.5 in.) clearance from the pole to the housing. Pole mounting brackets shall accommodate the wide range of pole sizes used in the telephone industry.
        (xix) Pad-mounted housings shall have hardware available for anchoring the housing base to the pad. A template may be provided to assist in the location of mounting attachment details for pad preparation.
        (xx) Housings equipped with stub cables shall have strain relief devices to permit shipping and handling of the housing without damage to the housing or stub cables. Only RUS accepted cable shall be used for stub cables. The cable manufacturer's recommendations concerning minimum bend radius shall be observed. The minimum bend radius for most copper cables is 10 times the cable diameter.
        (xxi) Cable supports shall be provided near the top of the ground line cover and other appropriate locations within the housing to provide cable stability consistent with the intended use and capacity of the housing. Cable supports shall be capable of holding a minimum load of 23 kg (50 lb).
        (xxii) An adequate supply of nonmetallic retainer clips or tie wraps capable of supporting a minimum load of 23 kg (50 lb) shall be provided with the housing. Adequate spaces for installation of the clips or tie wraps must be provided on the housing backplate and cable supports.
        (xxiii) Housing chambers designed for splicing operations shall be equipped with insulated supporting straps or rods suitable for supporting splice bundles. The insulation on the straps or rods shall extend for the entire length of the device and shall have a dielectric strength of 15 kilovolts (kv) direct current (dc) minimum. Housings having an ``H'' frame design where both front and rear covers may be removed may incorporate insulated tie bars to be used as cable supports.
        (xxiv) Housings designed to contain equipment in addition to splices shall be equipped with a device for physically separating the splice area from the service area of the housing.
        (xxv) A dielectric shield rated at 15 kv dc shall be provided to enclose the cable splice area. The shield shall extend from the lower cable supports to within 2.5 cm (1 in.) of the top of the housing. The shield shall be equipped with Velcro or equivalent fastening devices designed to hold the shield in both the open or closed positions. The fastening devices shall extend along the entire vertical edge of the dielectric shield.
        (xxvi) Mounting arrangements for a variety of terminal blocks and other equipment shall be provided by means of good housekeeping panels or other devices that may enhance the service aspect of the housing.
        (xxvii) Housings designed for SAI cabinets may be shipped with terminal blocks installed and stub cables attached. If this option is exercised, the stub cables and terminal blocks must be RUS accepted. In all cases, SAI cabinets must be equipped with appropriate mounting devices for installing the peripheral equipment required for a serving area interface.
        (xxviii) SAI cabinets shall be designed to provide physical separation between the splicing area and the area provided for running cross-connect jumpers.
        (xxix) SAI cabinets and large splice housings must have an external feature for attaching a padlock to prevent unauthorized entry.
        (xxx) Each housing shall have a tinned or zinc electroplated copper alloy or equivalent connector plate or bar to be used for terminating ground and cable shield bond connections. The device shall be equipped with captive studs and nuts with captive lock washers designed for attaching 6 American Wire Gauge (AWG) copper bonding harness wire or braid and a 6 AWG copper ground wire. Connector plates shall be equipped with enough studs and nuts to provide individual connections equivalent to the maximum number of cable sheaths recommended for the housing. Housings shall incorporate design features that enable the field installation of at least one additional connector plate for service conditions that require numerous connections. A bonding and grounding system capable of providing support and strain relief for service wires shall be provided for housings intended for use as distribution points. The bonding system shall be designed to provide sheath continuity as cable and service wires are installed, and prior to any other operation being performed. The bonding arrangement shall provide electrical continuity between all bonds and the ground connector plate. The bonding and grounding arrangement shall permit the lifting of individual cable ground connections for testing and cable locating activities without jeopardizing the grounding potential of other cables that may enter the housing. The bonding and grounding system shall be capable of conducting a current of 1000 amperes for at least 20 seconds.
        (4) Warning sign. (i) A buried cable warning sign shall be securely attached to the outside of each housing. The lettering information on the sign shall be permanent.
        (ii) For pedestals, the sign shall be centered horizontally on the front cover and the top of the sign shall be not more than 10 cm (4 in.) from the top of the housing.
        (iii) For SAI cabinets, the sign shall be centered horizontally and vertically on the door. If there are two doors, the sign shall be mounted on the left door.
        (iv) Deviations from warning sign location requirements are permitted only for housing design constraints. Alternate sign locations will be considered by RUS.
        (v) The RUS standard sign design is shown in Figure 1.
        (5) Housing materials. (i) Materials used in housings shall present no environmental or safety hazard as defined by industry standards or Federal, State, or local laws and regulations. Figure 1 is as follows:
E:\PICKUP\ER21OC94.000
        (ii) All materials are required to have fire resistance ratings consistent with recognized industry standards. External materials must be flame resistant.
        (iii) All materials used in the manufacture of housings or component parts must achieve the required strength properties, resist deterioration when exposed to outdoor conditions, and be acceptable to RUS for the specific application. New materials or materials not familiar to the RUS staff shall be supported by test and performance data which demonstrates their suitability for the intended use.
        (iv) Nonmetallic housing materials shall have a fungus growth rating no greater than one according to ASTM G 21 - 90.
        (v) Metallic components shall be either corrosion resistant or protected against corrosion and must not produce galvanic corrosion in wet or humid conditions on other metals that may be present in the housing environment.
        (vi) Mill galvanized steel used in the manufacture of housings shall comply with the appropriate requirements of one of the following standards:
        (A) ASTM A 109 - 91;
        (B) ASTM A 366/A 366M - 91;
        (C) ASTM A 525 - 91b; or
        (D) ASTM A 526/A 526M - 90.
        (vii) Hot rolled steel shall comply with the appropriate requirements of one of the following standards:
        (A) ASTM A 569/A 569M - 91a; or
        (B) ASTM A 621/A 621M - 92.
        (viii) Cold rolled steel shall comply with the appropriate requirements of one of the following standards:
        (A) ASTM A l09 - 91; or
        (B) ASTM A 366/A 366M - 91.
        (ix) Steel parts used for internal housing brackets shall be hexavalent chromate coated or zinc plated in accordance with ASTM B 633 - 85.
        (x) Hardware items used for assembling or fastening housing components shall be 300 series or passivated 400 series stainless steel or hot dip galvanized in accordance with ASTM A l53 - 82 (1987). Other materials will be considered by RUS on an individual basis.
        (xi) Aluminum components shall be fabricated from alloy types 5052 or 6061 or other types that have been recognized as having acceptable corrosion resistance and formability and weldability features.
        (xii) Nonmetallic parts must be resistant to solvents and stress cracking and shall be compatible with metals and other materials such as conductor insulations and filling compounds used in the manufacture of cable. Plastic materials must be noncorrosive to metals and resist deterioration when exposed to industrial chemical pollutants, ultra-violet rays, road salts, cleaning agents, insecticides, fertilizers, or other detrimental elements normally encountered in the outdoor environment.
        (xiii) Housing door seals and gaskets may be manufactured from rubber or synthetic rubber-like elastomer materials. Seals and gaskets shall exhibit a high degree of weatherability with an effective life of at least 30 years in the outdoor environment. The material shall be tear resistant and have a low compression set.
        (6) Housing finish requirements. (i) All interior and exterior surfaces of housings shall be free from blisters, wrinkles, cracks, scratches, dents, heat marks, and other defects.
        (ii) There shall be inherent design provisions to prevent objectionable deterioration of the housing such as rusting, exposure of fiber or delamination. Secondary protection, such as galvanizing over steel per ASTM A 526/A 526M - 90 or anodizing over aluminum, shall be provided to ensure reliability over the projected 30 year design life of the housing.
        (iii) Painted metal housings shall have a minimum gloss of 60 (60_ specular) in accordance with ASTM D 523 - 89.
        (iv) All painted surfaces shall have a uniform color and texture in accordance with ASTM D 3928 - 89. Nonmetallic housings shall meet recognized industry standards concerning optical appearance for gloss and haze as applicable for the material.
        (v) The colors of housings that RUS will consider for acceptance
(TABLE START)shall be as follows:
@h1Color
@h1Standard
Gray-Green  .... Munsell 6.5 GY 6.03/1.6
   .... Munsell 4.4 GY 6.74/1.5
Green  .... Munsell 8.8 G 2.65/5.3
Orange  .... Federal Standard 595A
   .... Color Number l2246
   .... Munsell 0.15YR 5.26/13.15
Chocolate  .... Munsell 5.27YR 2.40/2.60
   .... Color Number 835
(TABLE END)
        (7) Installation requirements. (i) The design of the housing must provide for a logical and normal installation sequence, i.e., excavation, installation of a foundation or base and anchoring devices, addition of hardware, installation and bonding of cables, splicing, addition of service, and final closing.
        (ii) No special tools or equipment other than that usually carried by outside plant technicians and construction crews must be required for installation of the housing. Security devices are the exception to this requirement.
        (iii) Installation hardware shall maintain housings in an erect and stable position when subjected to normal storm loads. Pad-mounted designs must accommodate precast or cast-in-place reinforced concrete or other suitable prefabricated material. Brackets, inserts for fastening, conduit openings, or other items necessary for a pad-mounted installation must be provided. The manufacturer shall provide detailed drawings or a template for locating inserts, conduit openings, or slots for cast-in-place pad construction.
        (e) Performance criteria and test procedures for housings -- (1) General information. (i) The housing manufacturer shall perform adequate inspections and tests to demonstrate that housings and housing components comply with RUS requirements.
        (ii) Testing shall be performed at a room temperature of 241B3 _C (751B5 _C). Temperatures for testing performed at other than room temperature shall be determined as near the center of the product under test as practical.
        (2) Description of test housing. (i) Each distinctly designed and configured family of housings intended to perform a particular function shall be tested.
        (ii) The typical test sample shall consist of the exterior housing components such as covers, backplates, good housekeeping panels, cap assembly, anchor posts, decals, etc. Interior components must include the bonding and grounding hardware for cables and service wires and the dielectric shield. The housing may include terminal blocks or cross-connect modules, cable splices, or the typical outside plant equipment the housing is designed to contain and protect.
        (3) Environmental requirement for housings -- (i) Thermal shock. The test housing shall be placed in a test chamber and exposed to the temperature cycle of Figure 2 for five complete cycles. The step function nature of the temperature changes may be achieved by insertion and removal of the test housing from the chamber. The soak time at each temperature shall be four hours. The housing shall be removed from the test chamber at the conclusion of the five-cycle period. After the test housing temperature has stabilized to room temperature, the housing must be inspected for deterioration of materials and satisfactory operation of mechanical functions. Figure 2 is as follows:
E:\PICKUP\ER21OC94.001
        (ii) Thermal shock and humidity. The test housing shall be placed in an environmental test chamber at 95 1B 3 percent (%) relative humidity (RH) and temperature cycled per Figure 3 for a period of 30 days. At the end of the test there shall be no rust or corrosion of any closure components. Minor corrosion due to surface scratches, nicks, etc. is permitted. If the closure is made of a nonmetallic material, there shall be no signs of degradation. Figure 3 is as follows:
E:\PICKUP\ER21oc94.002
        (iii) Humidity and condensation. Test panels shall be placed in an environmental chamber and subjected to 1,008 hours (42 cycles) of exposure per ASTM D 2247 - 92. One cycle consists of 24 hours of 100% humidity (with condensation on the panels) at a cabinet temperature of 381B1 _C (1001B2 _F) and an ambient temperature of 251B1 _C (771B2 _F) without heat input. Upon completion of cycling, the test panels shall be subjected to an 11 newton-meter (N-m) (100 pound-inches (lb-in.)) impact test using the Gardner-Impact Tester or equivalent. Test panels shall show no substrate or coating cracking or loss of coating adhesion on either side.
        (iv) Weatherability. Three test panels shall be tested for weatherability in accordance with the appropriate procedures of either ASTM D 822 - 89 or ASTM G 23 - 90. Total exposure time shall be a minimum of 800 hours. Failure is defined as fading, cracking, blistering, or delamination on any of the three test panels.
        (v) Low temperature durability. Low temperature durability shall be proven by exposing the three test panels from (e)(3)(iv) of this section to at least 25 continuous cycles of the following test sequence:
        (A) To insure complete saturation of the three test panels, soak them for 96 hours in a container of distilled water 221B2 _C (71.61B4 _F);
        (B) Lower the temperature of the water and the immersed test panels to 281B2 _C (18.41B4 _F) and stabilize for 24 hours;
        (C) Thaw the water with the samples to 221B2 _C (71.61B4 _F) and stabilize for 24 hours;
        (D) Repeat the procedure 24 times. Any cracking, crazing, deforming, or delaminating on any of the three test panels shall be considered a failure; and
        (E) Remove the samples from the water and impact test the three panels by delivering a force of 11.3 N-m (100 lb-in.) using a Gardner-Impact Tester to each specimen at 71, 22, and 281B2 _C (159.8, 71.6, and 18.41B4 _F), after stabilizing them at those temperatures for at least two hours. Visual inspection shall reveal no deformation or perforations on any of the test panels.
        (vi) Corrosion resistance. Corrosivity shall be tested in accordance with the requirements of ASTM B 117 - 90. Both scribed and unscribed panels shall be evaluated following the procedures of ASTM D 1654 - 92. Scribed panels shall have a rating of at least six, following 500 hours of exposure to salt fog, and the unscribed panels shall have a rating no lower than 10, after 1,000 hours exposure. Visual rust inspection shall confirm no more than 0.03% rusting (rust grade 9) of the surface area of the test sample when evaluated in accordance with ASTM D 610 - 85(1989). The unscribed samples shall be impacted with an 11.3 N-m (100 lb-in.) force, using a Gardner-Impact Tester or equivalent. Visual inspection of the impacted samples shall reveal no loss of adhesion between the base material and the coating or cracking at the finish on the test panels.
        (vii) Fungi resistance. Fungi resistance of nonmetallic housing materials shall be tested according to the procedures of ASTM G 21 - 90. Any rating greater than one shall be considered a failure.
        (viii) Stress crack resistance. The stress cracking characteristics of nonmetallic housing components shall be tested in accordance with ASTM D 1693 - 70 (Reapproved 1988). The tests shall be performed at 491B2\1/2\ C (1201B4\1/2\ F) for 14 days and exposed to the following materials:
        (A) Industry recognized filling compounds;
        (B) Isopar M;
        (C) Industry recognized solvents;
        (D) Industry recognized encapsulants; and
        (E) Commonly used insect, pest, and weed control products and agricultural fertilizers.
        (ix) Chemical resistance. (A) Chemical resistance shall be determined by immersing representative nonmetallic material samples in each of the following solutions for 72 hours at 221B2 _C (71.61B4 _F):
        (1) 3% sulfuric acid;
        (2) 100 parts per million (ppm) trichloroethane in water;
        (3) 0.2 N sodium hydroxide; and
        (4) Unleaded high octane gasoline.
        (B) There shall be no swelling, deformation, or softening of the material samples or any discoloration of the solution.
        (x) Ultraviolet resistance. Test panels of metallic and nonmetallic outer housing materials shall be subjected to 700 hours exposure per ASTM D 2565 - 92 using the type BH apparatus. The panels shall not exhibit fading, blistering, checking, or delamination.
        (xi) Weathertightness. The housing shall be mounted in its typical field installation position and sprayed with water. The temperature of the water shall be adjusted to be equal to or warmer than the temperature of the cabinet interior to avoid the possibility of condensation. A water spray head shall be used to direct water at the housing so that the water stream will strike the assembly at a downward angle of 45 degrees. The flow of the water shall be 3.8 liters per minute (one gallon per minute), with 276 kilopascals (40 pounds per square inch) head of pressure. The spray head shall be held 1.8 meters (m) (6 feet (ft)) from the test cabinet. The spray head shall be adjusted so that water impinges uniformly over the housing surface. The duration of the test shall be five minutes. All vertical cabinet surfaces shall be tested by this procedure. The exterior of the cabinet shall be thoroughly dried with towels (no heat drying) prior to examination of the housing interior. The interior of the housing shall be checked for presence of water. Wetting of over-lapping surfaces is permitted. There shall be no presence of water inside the housing.
        (xii) Wind Resistance. (A)(1) Stub pole or wall mounted SAI and large pair count splice housings shall be subjected to a load (F) as shown in Figure 4 and the following table to simulate the turning moment equivalent to a uniform wind load of 161 kilometers per hour (km/h)
(TABLE START)(100 miles per hour (mi/h)) perpendicular to the largest surface area.
@h1Maximum area of largest surface square centimeters cm2 (Square inches) (in.2)
@h1Load @h2kg @h2(lb)
5,200 (800) or less  .... 18  .... (40)
5,201 to 9,100 (801 to 1,400)  .... 32  .... (70)
9,101 to 13,000 (1,401 to 2,000)  .... 45  .... (100)
13,001 to 16,200 (2,001 to 2,500)  .... 57  .... (125)
Footnote: Note: The procedures for housings with larger surface area will be evaluated by RUS on a case-by-case basis.
(TABLE END)
        (2) The housing shall remain in its original mounting position throughout the test and exhibit no mechanical deformation.
        (3) Figure 4 is as follows:
E:\PICKUP\ER21OC94.003
        (B)(1) Pad or ground mounted SAI or splice housings shall be subjected to a load (F) as shown in Figure 5 and the following table to simulate the overturning moment equivalent to a uniform wind load of 161 km/h
(TABLE START)(100 mi/h) perpendicular to the largest surface area.
@h1Height cm (in.)
@h1Maximum area of largest surface cm2 (in.2)
@h1Load @h2kg @h2(lb)
122 (48) or less  .... 11,000 (1,700) or less  .... 91  .... (200)
   .... 11,001 - 13,000 (1,701 - 2,000)  .... 104  .... (230)
   .... 13,001 - 14,900 (2,001 - 2,300)  .... 118  .... (260)
123 - 152 (49 - 60)  .... 11,700 (1,800) or less  .... 91  .... (200)
   .... 11,701 - 14,300 (1,801 - 2,200)  .... 109  .... (240)
   .... 14,301 - 16,200 (2,201 - 2,500)  .... 127  .... (280)
   .... 16,201 - 18,800 (2,501 - 2,900)  .... 145  .... (320)
   .... 18,801 - 20,800 (2,901 - 3,200)  .... 163  .... (360)
   .... 20,801 - 23,400 (3,201 - 3,600)  .... 181  .... (400)
153 - 183 (61 - 72)  .... 14,300 (2,200) or less  .... 109  .... (240)
   .... 14,301 - 16,900 (2,201 - 2,600)  .... 127  .... (280)
   .... 16,901 - 19,500 (2,601 - 3,000)  .... 150  .... (330)
   .... 19,501 - 22,700 (3,001 - 3,500)  .... 172  .... (380)
   .... 22,701 - 25,300 (3,501 - 3,900)  .... 190  .... (420)
   .... 25,301 - 27,900 (3,901 - 4,300)  .... 213  .... (470)
Footnote: Note: The procedures for housings with larger surface areas will be evaluated by RUS on a case-by-case basis
(TABLE END)
        (2) The housing shall remain in its original mounting position throughout the test and exhibit no mechanical deformation.
        (3) Figure 5 is as follows:
E:\PICKUP\ER21OC94.004
        (xiii) Fire resistance. (A) The test housing shall be installed in a manner typical of field installation. U.S. No. 1 wheat straw shall be placed on the ground around the housing base in an one meter (3 ft) radius at an approximate depth of 10 cm (4 in.). The straw shall be ignited and permitted to burn fully. After the housing has cooled, its contents shall be inspected for evidence of ignition, melting, burning, or structural damage. Damage sufficient to impair service constitutes failure.
        (B) Polymeric materials shall be tested in accordance with the Underwriters Laboratories Publication (UL) 94, dated June 18, 1991. Materials used in housing components shall have a rating of 94V - 0 or 94V - 1 and shall not sustain combustion when an open flame source is removed.
        (4) Mechanical requirements for housings -- (i) Impact resistance. The test housing shall be subjected to the following impacts according to its minimum volume or minimum width and depth as shown in the
(TABLE START)following table:
@h1Minimum volume cm3 (in.3)
@h1Minimum width or depth cm (in.)
@h1Impact force @h2N-m @h2(lb-ft)
Less than 35,000 (2,100)  .... Less than 13 (5)  .... 68  .... (50)
35,000 (2,100) or greater  .... 13 (5) or greater  .... 136  .... (100)
(TABLE END)
        (A) The impact force shall be delivered to the front, back, and top surfaces. Circular housings shall be impacted on side surfaces 180_ apart and on the top. The device used to deliver the force shall be spherical and approximately 25 to 31 cm (10 to 12 in.) in diameter. A typical test procedure may include the use of a hard rubber bowling ball, weighing 6 to 7 kg (13 to 16 lb), enclosed in a mesh bag, attached to a rope with a metal ring. The load shall be dropped vertically on the top surface and applied to the sides with a pendulum motion using the appropriate height and extension arm to achieve the required impact force. The housing must be impacted at the approximate mid-point of the surface area.
        (B) Housings shall be conditioned for a minimum of eight hours at 40_C (40_F) in an environmental chamber prior to testing. If the chamber is insufficient in size to conduct tests within the chamber, the housing may be removed and shall be tested within 10 minutes after removal.
        (C) After impact testing, the housing shall not exhibit fractured or ruptured surfaces sufficient to allow the ingress of moisture or dust. The housing shall not exhibit mechanical damage that would impair the functioning of hinges, latches, locks, etc.
        (ii) Load deflection. Free standing buried plant housings shall be tested for load deflection in accordance with Figure 6. The assembled housing shall be rigidly held in place by a mechanical means to simulate a normal field installation. A length of wire or cable, or other suitable material, shall be placed around the top section of the housing and deadended. The wire or cable shall be initially tensioned to 23 kg (50 lb). A measurement shall then be taken of the deflection of the housing at the top as shown in Figure 6. The deflection shall be recorded at incremental loads of 23 kg (50 lb) until destruction of the housing occurs. The average load for the three directions shall not be less than 136 kg (300 lb) and the minimum load in any direction shall be 113 kg (250 lb). Failure is defined as housing component fracture or crazing of the housing's surface finish. Figure 6 is as follows:
E:\PICKUP\ER21OC94.005
        (iii) Vibration requirements. The test housing and its contents shall be subjected to acceleration at a sine wave frequency sweep rate as shown in Figure 7 for a housing packaged for shipment and Figure 8 for an unpackaged housing. The frequency sweep may be performed continually or sequentially. The test shall be conducted once along each of three mutually perpendicular axes of the housing. There shall be no mechanical or electrical degradation of the housing or its contents. Noticeable damage to the housing constitutes failure. Figure 7 and Figure 8 are as follows:
E:\PICKUP\ER21OC94.006
E:\PICKUP\ER21oc94.007
        (iv) Drop test requirements. Housings shall be subjected to appropriate drop tests according to their weight. The drop tests shall be performed on housings and their contents as normally packaged as well as on unpackaged housings. The tests shall be conducted on a smooth level concrete floor or similar unyielding surface. For corner drops, the packaged housing and its contents shall be oriented at impact such that a straight line drawn through the struck corner and package geometric center is approximately perpendicular to the impact surface.
        (A) Packaged housings and their contents weighing 91 kg (200 lb) or less shall be capable of enduring a single drop on each face or corner
(TABLE START)without damage from a height specified as follows:
@h1Packaged housing including contents weight kg (lb)
@h1Drop height cm (in.)
0 to 9 (0 to 20)  .... 76 (30)
10 to 23 (21 to 50)  .... 61 (24)
24 to 45 (51 to 100)  .... 53 (21)
46 to 91 (101 to 200)  .... 46 (18)
(TABLE END)
        (B) Packaged housings and their contents weighing more than 91 kg (200 lb) shall be capable of enduring a single drop on each of two diagonally opposite corners of the package without significant damage from a height
(TABLE START)specified as follows:
@h1Packaged housing including contents weight kg (lb)
@h1Drop height cm (in.)
92 to 453 (201 to 1000)  .... 30 (12)
Over to 453 (1000)  .... 15 (6)
(TABLE END)
        (1) The packaged housing and contents shall be placed on its normal shipping base with one corner supported 15 cm (6 in.) above the floor and the other corner of the same end supported 30 cm (12 in.) above the floor as shown in Figure 9. The unsupported end of the package shall be raised so that the lowest corner reaches the height listed above and then allowed to fall freely. Figure 9 is as follows:
E:\PICKUP\ER21OC94.008
        (2) The procedure of paragraph (e)(4)(iv)(B)(1) of this section shall be repeated for the diagonally opposite corner.
        (3) The packaged housing and contents shall be capable of enduring a single drop on each edge of the base of its normal shipping position from the required height without damage and shall remain operational without function impairment. The packaged housing and contents shall be placed on its base with one edge supported on a sill 15 cm (6 in.) high and the unsupported edge raised to the required height as shown in Figure 10 and allowed to fall freely. Figure 10 is as follows:
E:\PICKUP\ER21OC94.009
        (4) The procedure of (e)(4)(iv)(B)(3) of this section shall be repeated for all edges of the base.
        (C) Unpackaged housings and their contents weighing 23 kg (50 lb) or less shall be capable of enduring a single drop on each face and adjacent
(TABLE START)corners without significant damage from a height specified as follows:
@h1Packaged housing including contents weight kg (lb)
@h1Drop height cm (in.)
0 to 9 (0 to 20)  .... 10 (4)
10 to 23 (21 to 50)  .... 8 (3)
(TABLE END)
        (D)(1) Unpackaged housings and their contents weighing more than 23 kg (50 lb) shall be capable of enduring a single drop without significant damage when lifted by its normal hoisting supports as shown in
(TABLE START)Figure 11 and with its lowest point at a height specified as follows:
@h1Packaged housing including contents weight kg (lb)
@h1Drop height cm (in.)
23 to 45 (51 to 100)  .... 5 (2)
(TABLE END)
        (2) Figure 11 is as follows:
E:\PICKUP\ER21OC94.010
        (v) Firearms resistance. All housings shall be tested for resistance to penetration by direct impact from a 12 gauge shotgun equipped with a modified choke and the use of a 3\3/4\ dram equivalent powder charge and 35 grams #6 lead shot fired from a distance of 15 m (50 ft). The 12 gauge shotgun shall be fired from a normal standing position at the front side of the housing. Penetration through the housing wall by the lead shot shall constitute failure.
        (vi) Lifting hardware requirements. The lifting hardware on housings and their contents that weigh more than 91 kg (200 lb) shall be tested. The housing shall be fastened to a restraining device such as a concrete slab and subjected to loading through the lifting attachments to simulate the lifting load. For the first test a lifting line equipped with a dynamometer shall be attached to the housing lifting hardware and a load applied equal to three times the weight of a fully equipped housing. Deformation or damage to the housing or lifting hardware constitutes failure. A second test shall be conducted with the same arrangements as for the first except that a load shall be applied equal to six times the weight of a fully equipped housing. There shall be no catastrophic failure of the lifting hardware or housing.
        (vii) Stub cable strain relief tests. Housings equipped with cable stubs and cable shipping retainer shall be tested by lifting a test housing, with the maximum length and weight of cable orderable, in a manner causing the full weight of the cable to be supported by the cabinet. Examination of the cable sheath after lifting shall reveal no tearing, rupturing, or other damage. The cable conductors and shield shall be tested for shorts and opens. Electrical defects to the stub cable or damage to the housing constitutes failure.
        (viii) Door restrainer evaluation. (A) The housing shall be positioned with the door held in the open position by the door restraining device. A load, determined in accordance with the following table, shall be applied to the center of the door, perpendicular to the door and in each of
(TABLE START)the opening and closing directions.
@h1Maximum area of door surface cm7E7E2 (in.2)
@h1Load kg  (lb)
5,200 (800) or less  .... 72 (160)
5,201 to 9,100 (801 to 1,400)  .... 127 (280)
9,101 to 13,000 (1,401 to 2,000)  .... 181 (400)
Footnote: Note: Test procedures for housings with larger doors will be evaluated by RUS on a case-by-case basis.
(TABLE END)
        (B) There shall be no functional failure of the restraining device nor mechanical damage to the housing.
        (ix) Security evaluation. The security locking device shall be capable of withstanding a maximum torque of 2.8 N-m (25 lb-in.) without incurring physical damage to the closure, thereby resulting in a condition where the closure cannot be either accessed or locked.
        (5) Electrical requirements for housings. Each bonding stud and nut location shall be evaluated by attaching one lead from a dc or alternating current (ac) power source to a bonding stud with the nut torqued as specified by its manufacturer and the other power source lead connected to the closure grounding conductor connector. The current path thus established must be capable of sustaining a current of 1,000 amperes root-mean-square for at least 20 seconds without fusing or causing any damage to the closure or its contents.
        (6) Finish requirements -- (i) Impact resistance. The finish on painted metal surfaces shall not exhibit radial cracking on the impact surface (intrusion) when indented at 18 N-m (160 lb-in.) with a 1.6 cm (0.6 in.) diameter spherical indentor. This test shall be performed in accordance with ASTM D 2794 - 92 with the exception that the test panel shall be of the same material, thickness, and finish as the pedestal housing being evaluated.
        (ii) Finish adhesion. Painted finishes shall be tested for adhesion of finish in accordance with ASTM D 2197 - 86 (Reapproved 1991), Method A. There shall be no gouging in the top coat when tested with an 8 kg (17.7 lb) load. Gouging is defined as removal or separation of paint particles or breaking of the finish by the scraping loop to the extent of exposing base metal.
        (iii) Color evaluation. The color of the housing finish should be compared against the Munsell system of color notation, as described in ASTM D 1535 - 89 to determine color consistency with that desired.
        (iv) Gloss evaluation. The finish on painted housings shall be tested on two approximately 20 cm 0A 20 cm (8 in. 0A 8 in.) samples for each color used in accordance with the procedures of ASTM D 523 - 89. The finish shall have a minimum gloss of 60 (60_ Specular).
        (v) Secondary finish evaluation. Evidence of secondary protection shall be required for RUS acceptance. Typical secondary protection is galvanizing per ASTM A 526/A 526M - 90 for steel surfaces.
        (f) Functional design criteria for binding post terminal blocks used in SAI cabinets -- (1) General description. A conventional binding post terminal consists of a metallic element or post, one end of which is configured for the permanent connection of 22, 24, or 26 AWG solid copper conductors and the opposite end is configured for recurring connections and disconnections of solid copper cross-connect wire using a threaded screw or stud and nut combination for gripping the wire. The terminal is usually housed in a SAI cabinet. However, the terminal may receive limited use in smaller pedestal-type housings and pole mounted cabinets in the outside plant environment.
        (2) Design and fabrication requirements. (i) Terminal blocks used in outside plant housings are expected to perform satisfactorily for a nominal design life of 30 years.
        (ii) All individual terminals or terminal fields must be enclosed and the terminal enclosure must be totally filled with an encapsulating grease or gel which prevents connection degradation caused by moisture and corrosion. The encapsulant must provide complete encapsulation of terminal metallic connections and surfaces and totally fill all voids and cavities within individual terminal enclosures or terminal field enclosures to prevent ingress of moisture. The encapsulant must not restrict access to the terminal or restrict craft personnel from making connections. The encapsulant must be compatible with the standard materials used in cross-connect hardware and wiring.
        (iii) Binding post terminals shall not be susceptible to damage under normal use of standard tools used by outside plant technicians such as screwdrivers and test set clips. In addition, use of other tools such as scissors, diagonal cutters and long nose pliers for tightening and loosening screws shall not result in damage to the terminal.
        (iv) Terminals shall be designed so that a typical technician using customary tools shall be able to terminate cross-connect wire on a pair of terminals, or to remove it, without causing an electrical short between any two terminals or any other adjacent terminals.
        (v) The terminal count sequence shall be indicated using numerals of at least 0.25 cm (0.10 in.) in height.
        (vi) A means shall be provided to distinguish feeder terminals from distribution terminals.
        (vii) A means shall be provided to identify tip terminals and ring terminals in a terminal field. The identification convention shall indicate tip on the left with ring on the right for horizontal spacing and tip on the top with ring on the bottom for vertical spacing.
        (viii) The preferred height of the highest terminal in the connector field in a ground mounted SAI unit shall be 168 cm (66 in.) or less as measured from the top surface of the mounting pad. The bottom or lowest terminals in the connector field shall be at least 46 cm (18 in.) from the top surface of the pad.
        (ix) Pole mounted aerial units shall be 84 cm (33 in.) or less in width. The maximum allowable height of the highest terminals in a pole mounted aerial unit is 168 cm (66 in.) as measured from the top surface of the standard balcony seat used with the interface. For computation purposes, 15 cm (6 in.) shall be allowed for the distance between the bottom of the interface and the top of the balcony seat.
        (3) Auxiliary features. (i) SAI cabinets with terminal designs which do not permit direct attachment of common test instrument clips to terminal pairs without the occurrence of shorts shall be equipped with single pair auxiliary test contacts. The auxiliary test contacts shall attach to a terminal pair and provide a set of secondary terminals which will accept typical test instrument clips without the occurrence of shorts. Wire used to connect the auxiliary test contacts to the secondary terminals shall be 20 gauge minimum stranded conductor copper wire with a minimum dielectric strength between conductors of 15 kv. The test connector shall be functional on all terminal pairs.
        (ii) A 25 or 50 pair test connector shall be available which can be used to make reliable electrical contact to terminals associated with discrete 25 pair binder groups. The multi-pair test connector shall be provided with a minimum of 1.8 m (6 ft) of suitable cabling terminated to a connector, for interfacing with test sets common to the industry. The multi-pair test connector shall be functional on all terminal groups.
        (iii) A special service marker shall be available which must attach to a binding post terminal to identify special circuits and insulate exposed metal parts from accidental shorts from tools and wires. A supply of 25 special service markers shall be provided with each SAI cabinet. The color of special service markers shall be red.
        (iv)(A) A supply of twisted pair cross-connect wire shall be supplied with housings that are equipped with cross-connect terminals or that have provisions for mounting cross-connect terminals. The minimum length of cross-connect wire supplied is dependent on the SAI cabinet terminal capacity
(TABLE START)as follows:
@h1Cabinet termination capacity (pairs)
@h1Wire length
 1 to 600  .... 60 m (200 ft)
601 to 1200  .... 120 m (400 ft)
Over 1200  .... 180 m (600 ft)
(TABLE END)
        (B) The cabinet shall be equipped to store the length of wire in a manner designed for convenient dispensing. The cross-connect wire supply shall be easily replaceable.
        (g) Performance criteria and test procedures for binding post terminal blocks used in SAI cabinets -- (1) General. Many of the tests described in this section require that the terminal block be installed in an appropriate housing in its typical field configuration.
        (2) Environmental requirements -- (i) Insulation resistance/high humidity and salt fog exposure. A test specimen shall consist of a standard ground or pole mounted housing equipped with a full complement of binding post terminals equipped with 25 special service markers. The minimum number of terminals to be tested shall be 100 pair (100 tips and 100 associated rings). The test terminals shall be selected to form a terminal array of approximate square dimensions. A 1 cm (36 in.) length of cross-connect wire shall be installed on each test terminal. All tips shall be joined together and all rings shall be joined together with a 48 volt dc potential applied as shown in Figure 12 during the high humidity/salt fog and simulated rain exposures. The 48 volt dc may be temporarily removed from the test samples during the measurement process and the ring terminal being measured shall be isolated from the remaining ring terminals. The terminal insulation resistance shall be measured at a potential of 100 volts dc using suitable instrumentation with a minimum measurement range of 10\4\ to 10\12\ ohms. Figure 12 is as follows:
E:\PICKUP\ER21OC94.011
        (A) High humidity. The test housing shall be placed in an environmental test chamber at 951B3% RH and the temperature cycled as shown in Figure 3 in paragraph (e)(3)(ii) of this section for a period of 30 days. The cabinet doors shall remain in the fully open position. The insulation resistance between the ring terminal of each sample and all the common tip terminals shall be measured each 24 hours when the temperature is between 38 and 57 _C (100 and 135 _F) and increasing. The minimum insulation resistance when measured in accordance with paragraph (g)(2)(i) of this section shall not be less than 1 x 106 ohms.
        (B) Salt fog. A test housing with its doors closed shall be placed in a salt fog 35 _C (95 _F) test chamber and exposed to a salt fog spray per ASTM B 117 - 90 for a period of 30 days. The insulation resistance should be measured every 24 hours as indicated in paragraph (g)(2)(i) of the section and shall not be less than 1 x 106 ohms. The special service markers shall exhibit no sign of fading, corrosion, swelling, warping, running color, or other signs of deterioration.
        (ii) Insulation resistance/simulated rain exposure. (A) A test housing as described in paragraph (g)(2)(i) of this section shall be tested for water infiltration. The test shall be conducted using the method described in paragraph (e)(3)(xi) of this section. The cabinet doors shall remain closed for the duration of the test. The insulation resistance between the ring terminals and the common tip terminals shall be measured during and immediately following the spray application as indicated in paragraph (g)(2)(i) of this section and shall not be less than 1 x 10\6\ ohms.
        (B) With the cabinet doors open, a spray of tap water at a rate of 3.8 liters per minute (1 gallon per minute) at 276 kilo-pascals (40 pounds per square inch) shall be directed on the terminal array for a period of 1 minute saturating all of the terminals. Following the spray application the doors shall be closed. The cabinet shall be maintained in a temperature environment of 26 to 28 _C (78 to 82 _F) at 951B3% RH for 6 hours. The insulation resistance shall then be measured as specified in paragraph (g)(2)(i) of this section. The minimum insulation resistance shall not be less than 1 x 106 ohms.
        (iii) Contact resistance. A minimum of 100 terminals equipped with cross-connect wire that has been installed in a manner typical of that used in the industry shall be temperature cycled.
        (A) The test shall consist of eight-hour temperature cycles with one-hour dwells at extreme temperatures of
40 _C to +60 _C (40 _F to +140 _F), and temperature changes at an average rate of 16 _C (60 _F) per hour between the extremes. The relative humidity shall be maintained at 951B3%. The eight-hour test shall be conducted for 512 cycles. Millivolt drop measurements shall be made initially and after 2, 8, 16, 32, 64, 256, and 512 cycles with the samples at room temperature. The resistance measurement technique must conform to ASTM B 539 - 90. The measurement method must have an accuracy of at least 1B30 microohms for resistances less than 50 milliohms. The change in contact resistance shall not exceed 2 milliohms.
        (B) A minimum of 100 terminals equipped with cross-connect wire installed in a manner typical of the industry shall be maintained at 118 _C (245 _F) during the test period, except during disturbance measurement periods where each wire connection to the terminals shall have a 0.23 kg (0.5 lb) force momentarily applied in a manner to stress the connection. Initial millivolt measurements shall be made without disturbing the joints in accordance with paragraph (g)(2)(iii)(A) of this section with the samples at room temperature. After initial measurement each sample shall be disturbed followed by a millivolt drop measurement after 1, 2, 4, 8, 16, and 33 days. The change in contact resistance should be less than 2 milliohms when compared to the initial measurement.
        (iv) Fire resistance. A fully equipped cabinet including a full complement of cross-connect jumpers shall be installed in the standard field arrangement and tested for fire resistance in accordance with paragraphs (e)(3)(xiii) introductory text through (e)(3)(xiii)(B) of this section. After cooling, the cabinet, terminals, and associated wiring shall be inspected for signs of ignition, melting, burning, or structural damage of sufficient consequences such that the results are service affecting.
        (v) Encapsulant material compatibility. The terminal connection encapsulant compound must be compatible with the standard materials used in cross-connect hardware and wiring when aged in accordance with ASTM D 4568 - 86 at a temperature of 801B1 _C (1761B 2 _F). The conductor insulation shall retain a minimum of 85% of its unaged tensile strength and elongation values. The cross-connect hardware shall exhibit no visible material degradation.
        (vi) Encapsulant flow test. Terminal connection encapsulant must remain stable at 801B1 _C (1761B2 _F) when tested in an environmental chamber. Test specimens shall be suspended in a preheated oven over a glass dish or other drip-catching medium for a period of 24 hours. At the end of the test period, the glass dish shall be examined for evidence of flowing or dripping of encapsulant from the cross-connect terminal. More than 0.5 gram of encapsulant in the dish at the end of the test constitutes failure.
        (3) Mechanical requirements -- (i) Vibration. A test housing equipped with a full complement of cross-connect terminals and jumper wiring shall be subjected to vibration testing in accordance with paragraph (e)(4)(iii) of this section.
        (ii) Torsional capacity of binding posts. The test specimens shall consist of the complete binding post terminal consisting of the screw or nut, washers if required, and threaded post or stud respectively.
        (A) Test specimens shall include the terminals along the matrix edge at mid-span locations as well as centrally located terminals. Tests shall be conducted using a torque indicating screwdriver, or wrench, with an accuracy of 1B0.17 N-m (1B1.5 lb-in.) or better. The torque indicating device shall be used to tighten a screw or nut until failure of the screw or nut is achieved. Tests shall be conducted while the test specimen is stabilized at temperatures of 40 _C, 20 _C, and 71 _C (40 _F, +68 _F, and at +160 _F). Record the torques at terminal failure. At least 10 test specimens shall be tested at each temperature. The failure torque shall not be less than 2.8 N-m (25.0 lb-in.) for each temperature.
        (B) The post or stud of the binding post terminal shall not fail before the screw or nut when increasing torque. The faceplate or receptacle restraining the post or stud shall not fail before the screw or nut when increasing torque.
        (iii) Lateral loading capacity of binding posts. A minimum of three sets of 25 terminals shall be tested with the test specimens stabilized at temperatures of 40 _C, 20 _C and 71 _C (40 _F, +68 _F, and 100 _F). The test arrangement shall include the terminals along the matrix edge at mid-span locations as well as centrally located terminals. A force measuring device, such as a dynamometer, shall be attached to the end of a binding post terminal and a 16 kg (35 lb) force applied orthogonally to the terminal axis in 4 perpendicular directions as shown in Figure 13. Permanent deformation in excess of 0.08 cm (0.03 in.) or any structural damage in either the terminal or faceplate constitutes a failure. Figure 13 is as follows:
E:\PICKUP\ER21OC94.012
        (iv) Axial pullout resistance. A minimum of three sets of 25 terminals shall be tested with the test specimens stabilized at temperatures of 40 _C,
20 _C, and 71 _C (40 _F, +68 _F, and 100 _
F). The test arrangement shall include the terminals along the matrix edge at mid-span locations as well as centrally located terminals. A force measuring device, such as a dynamometer, shall be attached to a terminal and a force of 16 kg (35 lb) applied on axis as shown in Figure 14. There shall be no permanent deformation in excess of 0.08 cm (0.03 in.), any structural damage, or terminal pull-out in either the terminal or the faceplate. Figure 14 is as follows:
E:\PICKUP\ER21OC94.013
        (v) Test connector reliability. (A) A single pair connector shall be capable of making a minimum of 100 successive connections to binding post terminals without the occurrence of an open circuit. The test shall include terminals along the matrix edge, center, top, and bottom.
        (B) A multi-pair test connector shall be attached to the binding post terminal field and tests for opens between the binding post terminals and the test connector shall be conducted. All circuits must prove good. The test shall be repeated along the terminal matrix edges, center, top, and bottom.
        (vi) Service cycle reliability. A torque indicating device or wrench with an accuracy of 1B0.17 N-m (1B1.5 lb-in.) or better shall be used to tighten the terminal screw or nut as appropriate to 1.7 N-m (15.0 lb-in.). The terminal nut or screw is then loosened and retightened to 1.7 N-m (15 lb-in.). After 50 repeated connections and disconnections, the terminal shall be placed in an environmental chamber at 95% RH where the temperature shall be cycled as indicated in Figure 3 in paragraph (e)(3)(ii) of this section for a duration of 72 hours. The terminal shall then be momentarily removed from the chamber and the test procedure repeated. After a total of 250 loosening and retightening cycles have accumulated, the terminal must be capable of withstanding a torque of 1.7 N-m (15 lb-in.).
        (4) Dielectric strength. All housing components in the vicinity of unsheathed field cable conductors, unsheathed housing stub cable or harness conductors, terminals, or cross-connect wire paths shall have a minimum dielectric strength of 500 volts ac to the cabinet grounding and bonding bracket. Dielectric strength is tested by connecting one lead from a 500-volt ac at 0.5 ampere source to the cabinet ground connector and the other lead is passed along the surfaces of all cabinet components in the vicinity of unsheathed cable or harness conductors, cross-connect wire paths, and in the splice area where unsheathed field cable conductors may be located. Sparkover constitutes failure.
        (5) Operational requirements -- (i) Durability. In order to verify the durability requirements while minimizing the number of test housings required to complete the test program, the binding posts selected for tests shall be separately identified and then checked to establish compliance after the various tests have been conducted.
        (ii) Twenty-five jumper connections shall be made on each of two binding post connectors chosen at random from a representative sample in an assembled interface unit. After exposure to this test, these and adjacent connectors shall be inspected for damage such as cracks or chips in metal or plastic parts. Failure consists of structural damage, open circuits through the connector, or inability to pass the torsional, lateral loading, or axial pullout tests described in paragraphs (g)(3)(ii) through (g)(3)(iv) of this section.
        (iii) Select six binding posts at random in a representative interface. On each connector, attach any test cord included with the unit and then remove the test cord as follows. On binding post sample 1, remove the cord normally ten times. On binding post sample 2, remove the cord ten times by jerking the test leads straight out. In these and the remaining tests, do this without releasing any manual attachment mechanisms. On sample 3, remove ten times by jerking downward at 45_ from horizontal; sample 4, upward at 45_ ten times; sample 5, left 45_ ten times; sample 6, right 45_ ten times. Check for opens and damage in the test cord, clips, and connectors. Failure consists of structural damage, open circuits through the connector, or inability of the terminal blocks to pass the torsional, lateral loading, axial pullout, test connector reliability, or dielectric strength tests described in paragraphs (g)(3)(ii) through (g)(3)(v)(B), and paragraph (g)(4) of this section.
        (iv) Use craft tools such as scissors, diagonal cutters, and long nose pliers to loosen and tighten screws where the binding post design does not prohibit the possibility. Failure consists of severe structural damage.
        (h) Functional design criteria for insulation displacement type cross-connect modules used in SAI cabinets -- (1) General description. Cross-connect modules normally consist of multiple metallic contact elements that are retained by nonmetallic fixtures. The contact elements are spliced with permanent wire leads compatible for splicing to 22, 24, or 26 gauge cable on one side and configured for the acceptance of recurring connections and disconnections of plastic insulated cross-connect wire on the other side. Cross-connect modules are usually housed in a SAI cabinet. However, modules may receive limited usage in smaller pedestal-type housings and cabinets in the outside plant environment.
        (2) Design and fabrication requirements. (i) All individual terminals or terminal fields must be enclosed and the terminal enclosures must be totally filled with an encapsulating grease or gel which prevents connection degradation caused by moisture and corrosion. The encapsulant must provide complete encapsulation of terminal metallic connections and surfaces and totally fill all voids and cavities within individual terminal enclosures or terminal field enclosures to prevent ingress of moisture. The encapsulant must not restrict access to the terminal or restrict craft personnel from making connections. The encapsulant must be compatible with the standard materials used in cross-connect hardware and wiring.
        (ii) The cross-connect module manufacturer shall make available any nonstandard tools and test apparatus which are required for splicing, placing of jumpers, and the performance of maintenance operations.
        (iii) The module shall be designed so that a typical outside plant technician using tools shall be able to terminate cross-connect wire on terminals, or to remove them without causing electrical shorts between any other terminals.
        (iv) The pair count sequence terminated on a module shall be easily visible and shall have numerals of at least 0.25 cm (0.10 in.) in height.
        (v) Feeder terminations shall be easily distinguished from distribution terminations.
        (vi) Tip and ring terminations shall be easily visible and shall be identifiable as described in paragraph (f)(2)(vi) of this section.
        (vii) The preferred locations for cross-connect modules to be mounted inside a housing is the same as those for terminals and are described in paragraphs (f)(2)(vii) and (f)(2)(viii) of this section.
        (3) Auxiliary features. (i) Housings equipped with cross-connect modules shall be equipped with auxiliary test contacts as described in paragraphs (f)(3)(i) and (f)(3)(ii) of this section.
        (ii) Special service markers shall be available for cross-connect modules as described in paragraph (f)(3)(iii) of this section.
        (iii) Housings equipped with, or designed for, cross-connect modules shall contain a supply of cross-connect wire as described in paragraph (f)(3)(iv) of this section.
        (i) Performance criteria and test procedures for insulation displacement type cross-connect modules -- (1) General. Many of the tests described in this section require that the cross-connect module be installed in an appropriate housing in its typical field configuration for testing. Resistance measurements should be made with an electrical device which measures changes in resistance for each test parameter measured. The tests specified provide an indication of the stability of the electrical connections under the test conditions encountered.
        (2) Environmental requirements. (i) A fully equipped arrangement of cross-connect modules having approximately 25 special service markers shall successfully complete environmental testing in accordance with paragraphs (e)(3) introductory text through (e)(3)(xiii)(B) of this section.
        (ii) Insulation resistance/high humidity and salt fog exposure. Insulation resistance measurements shall not be less than 1 x 10\6\ ohms when cross-connect modules are tested by a procedure similar to that described in paragraphs (g)(2)(i) introductory text through (g)(2)(i)(B) of this section.
        (iii) Insulation resistance/simulated rain exposure. Insulation resistance measurements shall not be less than 1 x 10\6\ ohms when cross-connect modules are tested by a procedure similar to that described in and paragraphs (g)(2)(ii) introductory text through (g)(2)(ii)(B) of this section.
        (iv) Contact resistance. The change in contact resistance should not exceed 2 milliohms when cross-connect modules are tested by a procedure similar to that described in paragraphs (g)(2)(iii) introductory text through (g)(2)(iii)(B) of this section.
        (v) Fire resistance. A housing fully equipped with cross-connect modules and jumper wiring shall be tested for fire resistance by a procedure similar to that described in paragraph (g)(2)(iv) of this section.
        (vi) Encapsulant material compatibility. Cross-connect wire insulation and cross-connect hardware shall exhibit no visible material degradation when tested by the procedure described in paragraph (g)(2)(v) of this section.
        (vii) Encapsulant flow test. The cross-connect contact encapsulant shall drip no more than 0.5 gram when tested by the procedure described in paragraph (g)(2)(vi) of this section.
        (3) Mechanical requirements -- (i) Vibration. A housing fully equipped with cross-connect modules shall be vibration tested in accordance with paragraph (g)(3)(i) of this section.
        (ii) Test connector reliability. The test connectors supplied with housings intended for cross-connect modules shall successfully complete 100 successive connections as described in paragraphs (g)(3)(v) introductory text through (g)(3)(v)(B) of this section.
        (iii) Service cycle reliability. A combination of multiple insertions of jumper wires, vibration, and temperature cycling shall be performed on cross-connect modules. The multiple insertions on approximately 100 connections shall be accomplished by 300 operations consisting of insertion, removal and reinsertion of new jumper wire. Contact resistance shall be measured and the final insertion of jumper wire shall not be removed from the connectors but must be subjected to vibration testing in accordance with paragraph (g)(3)(i) of this section and temperature cycled as indicated in Figure 3 in paragraph (e)(3)(ii) of this section for a duration of 72 hours. After vibration and temperature cycling, the average change in contact resistance shall be no greater than 2 milliohms.
        (iv) Jumper wire pull-out resistance. Test modules that have received no prior conditioning shall be equipped with 100 38 cm (15 in.) jumper connections of the gauges recommended for use with the module using the insertion tool recommended by the cross-connect module manufacturer. With the test samples suitably supported, wires from each sample shall be pulled, one at a time, by a tensile machine at a cross-head speed of 6 centimeters per minute (cm/min) (2.4 inches per minute (in./min)). Wires shall be pulled both perpendicular and parallel to the plane of the cross-connect field and shall withstand a load of at least 1.1 kg (2.5 lb) before pulling out.
        (v) Cable conductor pull-out resistance. Test modules that have received no prior conditioning shall be equipped with 100 26, 24, and 22 AWG 38 cm (15 in.) cable conductors using the insertion tool recommended by the cross-connect module manufacturer. With the test samples suitably supported, conductors from each sample shall be pulled, one at a time, by a tensile machine at a cross-head speed of 6 cm/min (2.4 in./min). Wires shall be pulled both perpendicular and parallel to the plane of the face of the splice module and shall withstand a load of at least 1.1 kg (2.5 lb) before pulling out.
        (4) Electrical requirements -- (i) Dielectric strength. A housing fully equipped with cross-connect modules shall be tested for dielectric strength in accordance with (g)(4) of this section.
        (ii) The dielectric strength of a contact within the cross-connect module to contacts on either side shall be tested. The module shall be tested in a dry environment with an ac power source capable of supplying 8 kv at a rate of increase of 500 volts per second, a circuit breaker to open at breakdown, and a voltmeter to record the breakdown potential. Cross-connect modules shall be prepared in accordance with industry accepted splicing techniques with leads trimmed to approximately 38 cm (15 in.). The dielectric strength of each contact to the contacts on either side shall have an average dielectric strength of approximately 5.0 kv.
        (5) Operational requirements -- (i) Durability. In order to verify the durability requirements while minimizing the number of test housings required to complete the test program, the contacts selected for tests shall be separately identified and then checked to establish compliance after the various tests have been conducted.
        (ii) Twenty-five jumper connections shall be made on each of two contacts chosen at random from a representative sample in an assembled interface unit. After this test, these and surrounding contacts shall be inspected for damage such as cracks or chips in metal or plastic parts. Failure consists of structural damage, open circuits through the connector, or inability to pass the jumper wire pullout tests described in paragraph (i)(3)(iv) of this section.
        (iii) Select six contacts at random in a representative interface. On each of these contacts attach any test cord included with the unit as specified under normal use of that cord and then remove the test cord as follows. On sample 1, remove the cord normally ten times. On sample 2, remove the clip ten times by jerking the test leads straight out. In these and the remaining tests, do this without releasing any manual attachment mechanisms. On sample 3, remove ten times by jerking downward at 45_ from horizontal; sample 4, upward 45_ ten times; sample 5, left 45_ ten times; sample 6, right 45_ ten times. Check for opens and damage in the test cord, clips, and cross-connect modules. Failure consists of structural damage, open circuits through the connector, or inability of module to pass the test connector reliability, jumper wire pullout, and dielectric strength tests described in paragraphs (i)(3)(ii), (i)(3)(iv), and (i)(4)(ii) of this section.
        (j) Packaging and identification requirements -- (1) Product identification. (i) Each housing, terminal block, or cross-connect module shall be permanently marked with the manufacturer's name or trade mark.
        (ii) The date of manufacture, model number, serial number and RUS assigned designations shall be placed on a decal inside housings. The product identification nomenclature must correspond with the nomenclature used in the manufacturer's quality assurance program.
        (2) Packaging requirements. (i) Buried plant housings shall be packaged securely in an environmentally safe container to prevent either deterioration or physical damage to the unit during shipment, handling and storage.
        (ii) The product with all the necessary parts shall be shipped in one container unless significant advantages to the user can be obtained otherwise. Packaging of parts in the carton shall be such that the parts become available in the order in which they are needed. The package should be clearly marked as to which end to open. Packages shall be clearly labeled, and correspond to the names given in the instructions.
        (iii) Products packed in shipping containers shall be cushioned, blocked, braced, and anchored to prevent movement and damage.
        (iv) All products shall be secured to pallets with non-metallic strapping. The strapping and the manner employed shall be of sufficient quantity, width, and thickness to preclude failure during transit and handling.
        (v) The use of shrink or stretch film to secure the load to the pallet is permitted. However, such film must be applied over the required strapping.
        (vi) Containers that are too large or heavy to be palletized, such as crates, shall be shipped in their own containers. When practical, these containers shall be provided with skids to facilitate fork-lift handling.
        (vii) When packaged, the outer cartons shall meet the requirements of the Uniform Freight Classification and the National Motor Freight Classification.
        (3) Container marking requirements. (i) The package shall be readily identifiable as to the manufacturer, model number, date of manufacture, and serial number.
        (ii) The RUS assigned housing designation shall be stamped or marked on the outside of the package container with letter and number sizes large enough for easy identification.
        (iii) Each package shall be marked with its approximate gross weight.
        (iv) All containers carrying delicate or fragile items shall be marked to clearly identify this condition.
        (v) All marking shall be clear, legible, and as large as space permits.
(The information and recordkeeping requirements of this section have been approved by the Office of Management and Budget under control number 0572 - 0059)
[59 FR 53044, Oct. 21, 1994]_
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