UNITED STATES DEPARTMENT OF AGRICULTURE

Rural Utilities Service

**Bulletin 1753E-001 (Form 522)**

**SUBJECT:** RUS General Specification for Digital, Stored Program
Controlled Central Office Equipment

**TO:** All RUS Telecommunications Borrowers

RUS Telecommunications Staff

**EFFECTIVE DATE:** January 16, 1996

**EXPIRATION DATE:** Date of change of 7 CFR part 1755.522 by rulemaking

**OFFICE OF PRIMARY INTEREST:** Central Office Equipment Branch,
Telecommunications Standards Division

**PREVIOUS INSTRUCTIONS:** This revised Bulletin 1753E‑001 (Form 522),
RUS General Specification for Digital, Stored Program Controlled Central
Office Equipment, replaces Bulletin 1753E‑001 (Form 522), RUS General
Specification for Digital, Stored Program Controlled Central Office
Equipment issued June 4, 1993.

**FILING INSTRUCTIONS:** Discard Bulletin 1753E‑001 (Form 522) dated
June 4, 1993, and replace with this Bulletin 1753E-001. File with 7 CFR
part 1753 and is available to RUS staff on RUSNET.

**PURPOSE:** This revision removes the requirement for multiparty
service and associated features and services.

This bulletin is a \"user friendly\" reformat of the text codified in 7
CFR 1755.522 published at 60 FR 64311, dated December 15, 1995. Every
effort has been made to ensure the accuracy of this document. However,
in case of discrepancies, the regulation at 7 CFR 1755 section 1755.522
is the authorized source.

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Administrator Date

**TABLE OF CONTENTS**

Part I - General Specification

1\.
General\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....I-1

2\.
Reliability\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-3

3\. System Type Acceptance Tests\...\...\...\...\...\...\...\...\....I-4

4\. Types of
Requirements\...\...\...\...\...\...\...\...\...\...\.....I-4

5\. General
Requirements\...\...\...\...\...\...\...\...\...\...\...\...I-5

6\. Line Circuit
Requirements\...\...\...\...\...\...\...\...\...\....I-8

6.1
General\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....I-8

6.2
Dialing\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....I-9

6.3
Impedance\...\...\...\...\...\...\...\...\...\...\...\...\...\...\.....I-9

6.4
Lockout\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....I-9

6.5 Pay
Stations\...\...\...\...\...\...\...\...\...\...\...\...\...\.....I-9

6.6 Loop
Extension\...\...\...\...\...\...\...\...\...\...\...\...\.....I-10

6.7 Private Branch Exchange (PBX) Lines\...\...\...\...\...\.....I-10

6.8
Quantity\...\...\...\...\...\...\...\...\...\...\...\...\...\...\.....I-10

6.9
Types\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\.....I-10

7\. Intraoffice Switching Requirements\...\...\...\...\...\...\...I-10

8\. Interoffice Trunk Circuit Requirements\...\...\...\...\.....I-16

8.1
General\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-16

8.2
Quantity\...\...\...\...\...\...\...\...\...\...\...\...\...\...\.....I-16

8.3 Requirements for Interoffice Connections\...\...\...\...\...I-16

8.4 Requirements for Direct Digital Connections\...\...\...\...I-17

9\. Tone
Requirements\...\...\...\...\...\...\...\...\...\...\...\.....I-18

9.1
General\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-18

9.2 Tone
Specifications\...\...\...\...\...\...\...\...\...\...\...\...I-18

10\. System
Clock\...\...\...\...\...\...\...\...\...\...\...\...\...\....I-19

11\. Switched Access Service Arrangements\...\...\...\...\...\....I-20

11.1
General\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-20

11.2
Operation\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....I-20

12\. Fusing and Protection Requirements\...\...\...\...\...\...\...I-21

12.1
General\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-21

12.2
Fuses\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\.....I-21

12.3
Components\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-21

13\. Switching Network Requirements\...\...\...\...\...\...\...\....I-22

13.1 The
Network\...\...\...\...\...\...\...\...\...\...\...\...\...\.....I-22

13.2 Network
Quantity\...\...\...\...\...\...\...\...\...\...\...\...\...I-22

14\. Stored Program Control (SPC) Equipment Requirements\....I-22

**TABLE OF CONTENTS**

15\. Maintenance
Facilities\...\...\...\...\...\...\...\...\...\...\...I-24

15.1 Alarm Features, Including Alarm Sending\...\...\...\...\....I-24

15.2 Trouble Location and
Test\...\...\...\...\...\...\...\...\...\...I-26

15.3 Transmission
Testing\...\...\...\...\...\...\...\...\...\...\.....I-28

16\.
Traffic\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-30

16.1 General Engineering Guidelines\...\...\...\...\...\...\...\....I-30

16.2 Grade of
Service\...\...\...\...\...\...\...\...\...\...\...\...\...I-34

16.3 Holding
Times\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-35

16.4 Traffic Data
Requirements\...\...\...\...\...\...\...\...\...\...I-37

17\.
Transmission\...\...\...\...\...\...\...\...\...\...\...\...\...\....I-38

17.1
General\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-38

17.2
Impedance\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....I-38

17.3 Insertion
Loss\...\...\...\...\...\...\...\...\...\...\...\...\.....I-38

17.4 Frequency
Response\...\...\...\...\...\...\...\...\...\...\...\....I-39

17.5 Overload
Level\...\...\...\...\...\...\...\...\...\...\...\...\.....I-39

17.6 Gain Tracking
(Linearity)\...\...\...\...\...\...\...\...\...\...I-39

17.7 Return
Loss\...\...\...\...\...\...\...\...\...\...\...\...\...\.....I-40

17.8 Longitudinal
Balance\...\...\...\...\...\...\...\...\...\...\.....I-40

17.9 60 Hz Longitudinal Current Immunity\...\...\...\...\...\.....I-41

17.10 Steady
Noise\...\...\...\...\...\...\...\...\...\...\...\...\...\....I-41

17.11 Impulse
Noise\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-41

17.12 Crosstalk
Coupling\...\...\...\...\...\...\...\...\...\...\...\....I-41

17.13 Quantizing
Distortion\...\...\...\...\...\...\...\...\...\...\....I-41

17.14 Absolute
Delay\...\...\...\...\...\...\...\...\...\...\...\...\.....I-41

17.15 Envelope Delay
Distortion\...\...\...\...\...\...\...\...\...\...I-42

17.16 Digital Error
Rate\...\...\...\...\...\...\...\...\...\...\...\....I-42

17.17 Battery
Noise\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-42

17.18 Radio and Television Interference\...\...\...\...\...\...\....I-42

18\. Timing
Intervals\...\...\...\...\...\...\...\...\...\...\...\...\...I-42

18.1 Type of Equipment
Required\...\...\...\...\...\...\...\...\.....I-42

18.2
Tolerance\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....I-42

18.3 Permanent Signal
Timing\...\...\...\...\...\...\...\...\...\.....I-42

18.4 Partial Dial
Timing\...\...\...\...\...\...\...\...\...\...\...\...I-42

18.5 Charge Delay
Timing\...\...\...\...\...\...\...\...\...\...\...\...I-42

18.6 Called Party Disconnect Timing\...\...\...\...\...\...\...\....I-43

18.7 Timing Intervals for Signals Involved

in Distance Dialing\...\...\...\...\...\...\...\...\...\.....I-43

19\. Power Requirements and Equipment\...\...\...\...\...\...\.....I-43

19.1 Operating
Voltage\...\...\...\...\...\...\...\...\...\...\...\.....I-43

19.2
Batteries\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....I-43

19.3 Charging
Equipment\...\...\...\...\...\...\...\...\...\...\...\....I-44

19.4 Miscellaneous Voltage Supplies\...\...\...\...\...\...\...\....I-45

19.5 Ringing
Generators\...\...\...\...\...\...\...\...\...\...\...\....I-46

19.6 Interrupter
Equipment\...\...\...\...\...\...\...\...\...\...\....I-48

19.7 Power
Panels\...\...\...\...\...\...\...\...\...\...\...\...\...\....I-48

20\. Main Distributing
Frames\...\...\...\...\...\...\...\...\...\....I-49

**TABLE OF CONTENTS**

21\. Electrical
Protection\...\...\...\...\...\...\...\...\...\...\....I-50

21.1 Surge
Protection\...\...\...\...\...\...\...\...\...\...\...\...\...I-50

21.2 Extraordinary Surge Protection\...\...\...\...\...\...\...\....I-52

21.3 Dielectric
Strength\...\...\...\...\...\...\...\...\...\...\...\...I-52

21.4 Insulation
Resistance\...\...\...\...\...\...\...\...\...\...\....I-53

21.5
Self-protection\...\...\...\...\...\...\...\...\...\...\...\...\....I-53

21.6 Static
Discharge\...\...\...\...\...\...\...\...\...\...\...\...\...I-53

22\.
Miscellaneous\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-53

22.1 Office
Wire\...\...\...\...\...\...\...\...\...\...\...\...\...\.....I-53

22.2 Wire Wrapped
Terminals\...\...\...\...\...\...\...\...\...\...\...I-53

22.3 Protection Against
Corrosion\...\...\...\...\...\...\...\...\...I-54

22.4 Screws and
Bolts\...\...\...\...\...\...\...\...\...\...\...\...\...I-54

22.5 Temperature and Humidity Range\...\...\...\...\...\...\...\....I-54

22.6
Stenciling\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-54

22.7 Equipment Frame
Design\...\...\...\...\...\...\...\...\...\...\...I-54

22.8 Quantity of Equipment
Bays\...\...\...\...\...\...\...\...\.....I-54

23\. Remote Switching Terminal (RST)\...\...\...\...\...\...\...\...I-55

23.1
General\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-55

23.2 Span
Line\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....I-55

23.3
Switching\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....I-55

23.4 Subscriber Line
Test\...\...\...\...\...\...\...\...\...\...\.....I-55

23.5
Housing\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...I-56

23.6
Power\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\.....I-56

23.7
Alarm\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\.....I-57

24\. Responsibilities of the Bidder\...\...\...\...\...\...\...\....I-57

24.1 Central Office
Layout\...\...\...\...\...\...\...\...\...\...\....I-57

24.2 Shipment of Main Distributing Frame (MDF)\...\...\...\.....I-57

24.3 Drawings and Printed Material\...\...\...\...\...\...\...\.....I-58

24.4 Distributing Frame
Wire\...\...\...\...\...\...\...\...\...\.....I-59

24.5 Technical Assistance
Service\...\...\...\...\...\...\...\...\...I-59

24.6 Spare
Parts\...\...\...\...\...\...\...\...\...\...\...\...\...\.....I-59

24.7 Environmental
Requirements\...\...\...\...\...\...\...\...\.....I-61

24.8 Unit Costs for Cost Separation Purposes\...\...\...\...\....I-61

24.9 Single‑point Grounding System Acceptance\...\...\...\...\...I-62

**FIGURES**

Figure 1 - Measuring the Effects of Low Frequency Induction..I-63

Figure 2 - Charger Noise
Test\...\...\...\...\...\...\...\...\...\.....I-64

Figure 3 - Summary of Electrical Requirements and Tests\...\...I-65

Figure 4 - Explanation of Surge Waveshape\...\...\...\...\...\.....I-66

Figure 5 - Current Surge
Test\...\...\...\...\...\...\...\...\...\.....I-67

Figure 6 - 60 Hz Current Surge
Test\...\...\...\...\...\...\...\.....I-68

Figure 7 - Explanation of Arrester Response Delay Time\...\....I-69

**TABLE OF CONTENTS**

Part II - Installation

1\.
Installation\...\...\...\...\...\...\...\...\...\...\...\...\...\....II-1

1.1 Responsibilities of
Owner\...\...\...\...\...\...\...\...\...\...II-1

1.2 Responsibilities of Bidder\...\...\...\...\...\...\...\...\.....II-2

1.3 Installation
Requirements\...\...\...\...\...\...\...\...\...\...II-4

1.4 Operational Test Requirements\...\...\...\...\...\...\...\.....II-4

1.5 Grounding System
Audit\...\...\...\...\...\...\...\...\...\...\...II-5

Part III - Specification for Digital, Stored Program Controlled Central
Office Equipment Detailed Requirements (Host)

1\.
General\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...III-1

2\. Numbering
Scheme\...\...\...\...\...\...\...\...\...\...\...\...\...III-2

3\. Office
Clock\...\...\...\...\...\...\...\...\...\...\...\...\...\....III-4

4\. Interoffice Trunking
Diagram\...\...\...\...\...\...\...\...\...III-4

5\. Translator Function
Chart\...\...\...\...\...\...\...\...\...\...III-5

6\. Line Circuit
Requirements\...\...\...\...\...\...\...\...\...\...III-6

6.1 Types of
Lines\...\...\...\...\...\...\...\...\...\...\...\...\.....III-6

6.2 Data on Lines Requiring Range Extension\...\...\...\...\....III-7

7\. Traffic Data - Line Originating and

Terminating Traffic\...\...\...\...\...\...\...\...\...\....III-9

8\. Trunk Circuit
Requirements\...\...\...\...\...\...\...\...\....III-11

8.1 Interoffice
Trunking\...\...\...\...\...\...\...\...\...\...\....III-11

8.2 Switched Traffic
Data\...\...\...\...\...\...\...\...\...\...\...III-12

9\. Checklist of Features Required\...\...\...\...\...\...\...\...III-13

9.1 Alternate
Routing\...\...\...\...\...\...\...\...\...\...\...\....III-13

9.2 Data
Service\...\...\...\...\...\...\...\...\...\...\...\...\...\...III-13

9.3 Office
Type\...\...\...\...\...\...\...\...\...\...\...\...\...\....III-13

9.4 Billing
Data\...\...\...\...\...\...\...\...\...\...\...\...\...\...III-14

9.5 Pollable
Systems\...\...\...\...\...\...\...\...\...\...\...\.....III-14

9.6 AMA
Format\...\...\...\...\...\...\...\...\...\...\...\...\...\.....III-14

10\. Miscellaneous Operating Features\...\...\...\...\...\...\....III-15

10.1 Busy
Verification\...\...\...\...\...\...\...\...\...\...\...\....III-15

10.2 Revertive Calls - Directory Number Only\...\...\...\...\...III-15

10.3 Intercept
Facilities\...\...\...\...\...\...\...\...\...\...\....III-15

10.4 Line Load
Control\...\...\...\...\...\...\...\...\...\...\...\....III-16

10.5 Service Observing
Facilities\...\...\...\...\...\...\...\.....III-16

10.6 Hotel-Motel
Arrangements\...\...\...\...\...\...\...\...\...\...III-16

10.7 Nailed Up
Connections\...\...\...\...\...\...\...\...\...\...\...III-17

10.8 Vertical
Services\...\...\...\...\...\...\...\...\...\...\...\....III-17

**TABLE OF CONTENTS**

11\. Maintenance Facility Requirements\...\...\...\...\...\...\...III 17

11.1 Alarm
Signals\...\...\...\...\...\...\...\...\...\...\...\...\.....III 17

11.2 Trouble Location and Test\...\...\...\...\...\...\...\...\.....III
18

11.3 Transmission
Tests\...\...\...\...\...\...\...\...\...\...\...\...III-19

11.4 Line
Testing\...\...\...\...\...\...\...\...\...\...\...\...\...\...III-19

11.5 Remote
Control\...\...\...\...\...\...\...\...\...\...\...\...\....III-19

12\. Power Equipment
Requirements\...\...\...\...\...\...\...\.....III-20

12.1 Central Office
Battery\...\...\...\...\...\...\...\...\...\.....III-20

12.2 Charging
Equipment\...\...\...\...\...\...\...\...\...\...\...\...III-21

12.3 Ringing
Equipment\...\...\...\...\...\...\...\...\...\...\...\....III-21

12.4 Power
Board\...\...\...\...\...\...\...\...\...\...\...\...\...\....III-22

13\. Distributing Frame Requirements\...\...\...\...\...\...\.....III-22

14\. Building and Floor Plan Information\...\...\...\...\...\....III-23

15\. Alternate
Requests\...\...\...\...\...\...\...\...\...\...\...\...III-25

16\. Explanatory
Notes\...\...\...\...\...\...\...\...\...\...\...\....III-26

Part IV -Detailed Information on Remote Switching Terminals (RST\'s)

1\. Number of Subscriber
Lines\...\...\...\...\...\...\...\...\...\...IV-1

2\.
Traffic\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....IV-1

3\. Subscriber Loop
Resistance\...\...\...\...\...\...\...\...\...\...IV-1

4\. Range
Extension\...\...\...\...\...\...\...\...\...\...\...\...\.....IV-2

5\. Power
Supply\...\...\...\...\...\...\...\...\...\...\...\...\...\.....IV-2

6\. Emergency
Operation\...\...\...\...\...\...\...\...\...\...\...\....IV-3

7\. RST Distribution Frame Requirements\...\...\...\...\...\...\...IV-3

8\. Building and Floor Plan Information\...\...\...\...\...\...\...IV-5

9\. Subscriber Line
Test\...\...\...\...\...\...\...\...\...\...\...\...IV-5

10\. Span Lines to Host Central Office\...\...\...\...\...\...\.....IV-5

11\. Grounding
Considerations\...\...\...\...\...\...\...\...\...\.....IV-5

12\. Explanatory
Notes\...\...\...\...\...\...\...\...\...\...\...\...\...IV-6

Part V - Specifications for Digital, Stored Program Controlled Central
Office Equipment Detailed Requirements - Bidder Supplied Information

1\.
General\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\.....V-1

2\. Performance
Objectives\...\...\...\...\...\...\...\...\...\...\.....V-2

2.1
Reliability\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....V-2

2.2 Busy Hour Load Capacity and Traffic Delay\...\...\...\...\....V-2

3\. Equipment Quantities Dependent on System Design\...\...\....V-2

3.1 Switch Frames and
Circuits\...\...\...\...\...\...\...\...\...\....V-2

4\.
RST\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....V-3

**TABLE OF CONTENTS**

5\.
Power\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....V-4

5.1 AC Power Drain
Watts\...\...\...\...\...\...\...\...\...\...\...\....V-4

5.2 Heat Dissipation
Watts\...\...\...\...\...\...\...\...\...\...\.....V-4

6\. Additional Information to be Furnished by Bidder\...\...\...V-4

7\. Explanatory
Notes\...\...\...\...\...\...\...\...\...\...\...\...\....V-5

Part VI - Acceptance Checklist - Single-point Grounding System

1\. Approval
Statement\...\...\...\...\...\...\...\...\...\...\...\.....VI-1

2\. General
Survey\...\...\...\...\...\...\...\...\...\...\...\...\...\...VI-2

3\. Master Ground Bar
(MGB)\...\...\...\...\...\...\...\...\...\...\...VI-6

4\. Ground Window Bar
(GWB)\...\...\...\...\...\...\...\...\...\...\...VI-8

5\. Isolated Ground Zone
(IGZ)\...\...\...\...\...\...\...\...\...\...VI-9

6\. Entrance and Tip
Cables\...\...\...\...\...\...\...\...\...\.....VI-10

7\. Cable Entrance Ground Bar (CEGB)\...\...\...\...\...\...\.....VI-11

8\. Main Distributing Frame (MDF)\...\...\...\...\...\...\...\.....VI-13

9\. Power Service Protection and Grounding\...\...\...\...\.....VI-16

10\.
Miscellaneous\...\...\...\...\...\...\...\...\...\...\...\...\...\...VI-17

**INDEX:**

Specifications, Digital Central Office Equipment

**ABBREVIATIONS**

4HW 4-high Consecutive Week

AC or ac Alternating Current

AMA Automatic Message Accounting

ANC All Number Calling

ANI Automatic Number Identification

ANSI American National Standards Institute

ASTM American Society for Testing Materials

AWG American Wire Gauge

CAROT Centralized Automatic Reporting on Trunks

CCS Centum (hundred) Call Seconds

CEGB Cable Entrance Ground Bar

CFR Code of Federal Regulations

COE Central Office Equipment

dB Decibel

dBm0 Decibel Metallic Referenced to Zero

dBrnC Decibels above Reference Noise, C-message Weighted

dc Direct Current

DDD Direct Distance Dialing

DP Dial Pulse

EMF Electromotive Force

ERL Echo Return Loss

**ABBREVIATIONS (Continued)**

ESS Electronic Switching System

GWB Ground Window Bar

Hz Hertz

IEEE Institute of Electrical and Electronic Engineers

IGZ Isolated Ground Zone

LAMA Local Automatic Message Accounting

LSSGR LATA Switching Systems Generic Requirements

MDF Main Distributing Frame

MF Multifrequency

MGB Master Ground Bar

PBX Private Branch Exchange

PC Printed Circuit

PCM Pulse Code Modulation

PPS Pulses per Second

rms Root Mean Square

ROH Receiver Off-Hook

RST Remote Switching Terminal

RUS Rural Utilities Service

SDN Subscriber Directory Number

SPC Stored Program Control

SRL Singing Return Loss

SxS Step-by-Step

TE&CM Telecommunications Engineering and Construction Manual

VF Voice Frequency

°C Degree Centigrade

°F Degree Fahrenheit

**BULLETIN TO CFR PARAGRAPH NUMBER CROSS-REFERENCE**

PART I GENERAL SPECIFICATION

  ------------------------------------- ---------------------------------
  **[1753E-001]{.underline}**           **[1753E-001]{.underline}**
  **[1755.522]{.underline}**\           **[1755.522]{.underline}**\
  \                                     \
  1. (a)\                               5.15 (e)(15)\
  1.1 (a)(1)\                           5.16 (e)(16)\
  1.2 (a)(2)\                           5.17 (e)(17)\
  1.3 (a)(3)\                           5.18 (e)(18)\
  1.4 (a)(4)\                           5.19 (e)(19)\
  1.5 (a)(5)\                           5.19.1 (e)(19)(i)\
  1.6 (a)(6)\                           5.19.2 (e)(19)(ii)\
  1.7 (a)(7)\                           5.19.3 (e)(19)(iii)\
  1.8 (a)(8)\                           5.19.4 (e)(19)(iv)\
  1.9 (a)(9)\                           5.19.5 (e)(19)(v)\
  1.10 (a)(10)\                         5.19.6 (e)(19)(vi)\
  1.11 (a)(11)\                         5.19.7 (e)(19)(vii)\
  1.12 (a)(12)\                         5.19.8 (e)(19)(viii)\
  \                                     5.19.9 (e)(19)(ix)\
  2. (b)\                               \
  2.1 (b)(1)\                           6. (f)\
  2.2 (b)(2)\                           6.1 (f)(1)\
  2.3 (b)(3)\                           6.1.1 (f)(1)(i)\
  \                                     6.1.2 (f)(1)(ii)\
  3. (c)\                               6.1.3 (f)(1)(iii)\
  3.1 (c)(1)\                           6.2 (f)(2)\
  3.2 (c)(2)\                           6.2.1 (f)(2)(i)\
  3.3 (c)(3)\                           6.2.2 (f)(2)(ii)\
  \                                     6.2.3 (f)(2)(iii)\
  4. (d)\                               6.3 (f)(3)\
  4.1 (d)(1)\                           6.4 (f)(4)\
  4.2 (d)(2)\                           6.4.1 (f)(4)(i)\
  4.3 (d)(3)\                           6.4.2 (f)(4)(ii)\
  4.4 (d)(4)\                           6.5 (f)(5)\
  4.5 (d)(5)\                           6.6 (f)(6)\
  \                                     6.6.1 (f)(6)(i)\
  5. (e)\                               6.6.2 (f)(6)(ii)\
  5.1 (e)(1)\                           6.6.3 (f)(6)(iii)\
  5.2 (e)(2)\                           6.7 (f)(7)\
  5.3 (e)(3)\                           6.8 (f)(8)\
  5.4 (e)(4)\                           6.9 (f)(9)\
  5.5 (e)(5)\                           \
  5.6 (e)(6)\                           7. (g)\
  5.7 (e)(7)\                           7.1 (g)(1)\
  5.8 (e)(8)\                           7.1.1 (g)(1)(i)\
  5.9 (e)(9)\                           7.1.2 (g)(1)(ii)\
  5.10 (e)(10)\                         7.1.3 (g)(1)(iii)\
  5.11 (e)(11)\                         7.1.4 (g)(1)(iv)\
  5.12 (e)(12)\                         7.1.5 (g)(1)(v)\
  5.13 (e)(13)\                         7.1.6 (g)(1)(vi)
  5.14 (e)(14)                          

  **[1753E-001]{.underline}**           **[1753E-001]{.underline}**
  **[1755.522]{.underline}**\           **[1755.522]{.underline}**\
  \                                     \
  7.1.7 (g)(1)(vii)\                    7.8.1 (g)(8)(i)\
  7.1.8 (g)(1)(viii)\                   7.8.2 (g)(8)(ii)\
  7.1.9 (g)(1)(ix)\                     7.9 (g)(9)\
  7.1.10 (g)(1)(x)\                     7.9.1 (g)(9)(i)\
  7.1.11 (g)(1)(xi)\                    7.9.2 (g)(9)(ii)\
  7.1.12 (g)(1)(xii)\                   7.9.3 (g)(9)(iii)\
  7.1.13 (g)(1)(xiii)\                  7.9.4 (g)(9)(iv)\
  7.1.14 (g)(1)(xiv)\                   7.9.5 (g)(9)(v)\
  7.1.15 (g)(1)(xv)\                    7.10 (g)(10)\
  7.2 (g)(2)\                           7.11 (g)(11)\
  7.2.1 (g)(2)(i)\                      7.11.1 (g)(11)(i)\
  7.2.2 (g)(2)(ii)\                     7.11.2 (g)(11)(ii)\
  7.2.3 (g)(2)(iii)\                    7.11.3 (g)(12)\
  7.2.4 (g)(2)(iv)\                     \
  7.2.5 (g)(2)(v)\                      8. (h)\
  7.2.6 (g)(2)(vi)\                     8.1 (h)(1)\
  7.2.7 (g)(2)(vii)\                    8.1.1 (h)(1)(i)\
  7.2.8 (g)(2)(viii)\                   8.1.2 (h)(1)(ii)\
  7.2.9 (g)(2)(ix)\                     8.1.3 (h)(1)(iii)\
  7.2.10 (g)(2)(x)\                     8.1.4 (h)(1)(iv)\
  7.2.11 (g)(2)(xi)\                    8.2 (h)(2)\
  7.2.12 (g)(2)(xii)\                   8.3 (h)(3)\
  7.2.13 (g)(2)(xiii)\                  8.3.1 (h)(3)(i)\
  7.3 (g)(3)\                           8.3.2 (h)(3)(ii)\
  7.3.1 (g)(3)(i)\                      8.3.3 (h)(3)(iii)\
  7.3.2 (g)(3)(ii)\                     8.3.4 (h)(3)(iv)\
  7.3.3 (g)(3)(iii)\                    8.3.5 (h)(3)(v)\
  7.3.4 (g)(3)(iv)\                     8.3.6 (h)(3)(vi)\
  7.3.5 (g)(3)(v)\                      8.3.7 (h)(3)(vii)\
  7.3.6 (g)(3)(vi)\                     8.3.8 (h)(3)(viii)\
  7.4 (g)(4)\                           8.4 (h)(4)\
  7.5 (g)(5)\                           8.4.1 (h)(4)(i)\
  7.5.1 (g)(5)(i)\                      8.4.2 (h)(4)(ii)\
  7.5.2 (g)(5)(ii)\                     8.4.3 (h)(4)(iii)\
  7.5.3 (g)(5)(iii)\                    \
  7.5.4 (g)(5)(iv)\                     9. (i)\
  7.6 (g)(6)\                           9.1 (i)(1)\
  7.6.1 (g)(6)(i)\                      9.2 (i)(2)\
  7.6.2 (g)(6)(ii)\                     9.2.1 (i)(2)(i)\
  7.6.3 (g)(6)(iii)\                    9.2.2 (i)(2)(ii)\
  7.6.4 (g)(6)(iv)\                     9.2.3 (i)(2)(iii)\
  7.6.5 (g)(6)(v)\                      9.2.4 (i)(2)(iv)\
  7.6.6 (g)(6)(vi)\                     9.2.5 (i)(2)(v)\
  7.7 (g)(7)\                           9.2.6 (i)(2)(vi)\
  7.7.1 (g)(7)(i)\                      9.2.7 (i)(2)(vii)\
  7.7.2 (g)(7)(ii)\                     9.2.8 (i)(2)(viii)\
  7.7.3 (g)(7)(iii)\                    9.2.9 (i)(2)(ix)\
  7.7.4 (g)(7)(iv)\                     9.2.10 (i)(2)(x)
  7.8 (g)(8)                            
  ------------------------------------- ---------------------------------

  ------------------------------------- ---------------------------------
  **[1753E-001]{.underline}**           **[1753E-001]{.underline}**
  **[1755.522]{.underline}**\           **[1755.522]{.underline}**\
  \                                     \
  9.2.11 (i)(2)(xi)\                    14.4.4 (n)(4)(iv)\
  9.2.12 (i)(2)(xii)\                   14.4.5 (n)(4)(v)\
  \                                     14.4.6 (n)(4)(vi)\
  10. (j)\                              14.4.7 (n)(4)(vii)\
  10.1 (j)(1)\                          14.4.8 (n)(4)(viii)\
  10.2 (j)(2)\                          14.5 (n)(5)\
  10.2.1 (j)(2)(i)\                     14.6 (n)(6)\
  10.2.2 (j)(2)(ii)\                    14.7 (n)(7)\
  10.2.3 (j)(2)(iii)\                   \
  10.3 (j)(3)\                          15. (o)\
  10.3.1 (j)(3)(i)\                     15.1 (o)(1)\
  10.3.2 (j)(3)(ii)\                    15.1.1 (o)(1)(i)\
  10.3.3 (j)(3)(iii)\                   15.1.2 (o)(1)(ii)\
  \                                     15.1.2.1 (o)(1)(ii)(A)\
  11. (k)\                              15.1.2.2 (o)(1)(ii)(B)\
  11.1 (k)(1)\                          15.1.2.3 (o)(1)(ii)(C)\
  11.2 (k)(2)\                          15.1.3 (o)(1)(iii)\
  11.2.1 (k)(2)(i)\                     15.1.4 (o)(1)(iv)\
  11.2.2 (k)(2)(ii)\                    15.1.5 (o)(1)(v)\
  11.2.3 (k)(2)(iii)\                   15.1.6 (o)(1)(vi)\
  11.2.4 (k)(2)(iv)\                    15.1.7 (o)(1)(vii)\
  11.2.5 (k)(2)(v)\                     15.1.8 (o)(1)(viii)\
  11.2.6 (k)(2)(vi)\                    15.1.9 (o)(1)(ix)\
  11.2.7 (k)(2)(vii)\                   15.1.10 (o)(1)(x)\
  11.2.8 (k)(2)(viii)\                  15.1.10.1 (o)(1)(x)(A)\
  \                                     15.1.10.2 (o)(1)(x)(B)\
  12. (l)\                              15.1.10.3 (o)(1)(x)(C)\
  12.1 (l)(1)\                          15.1.10.4 (o)(1)(x)(D)\
  12.1.1 (l)(1)(i)\                     15.1.11 (o)(1)(xi)\
  12.1.2 (l)(1)(ii)\                    15.1.12 (o)(1)(xii)\
  12.2 (l)(2)\                          15.2 (o)(2)\
  12.3 (l)(3)\                          15.2.1 (o)(2)(i)\
  12.3.1 (l)(3)(i)\                     15.2.1.1 (o)(2)(i)(A)\
  12.3.2 (l)(3)(ii)\                    15.2.1.2 (o)(2)(i)(B)\
  12.3.3 (l)(3)(iii)\                   15.2.2 (o)(2)(ii)\
  \                                     15.2.2.1 (o)(2)(ii)(A)\
  13. (m)\                              15.2.2.2 (o)(2)(ii)(B)\
  13.1 (m)(1)\                          15.2.2.3 (o)(2)(ii)(C)\
  13.1.1 (m)(1)(i)\                     15.2.2.4 (o)(2)(ii)(D)\
  13.1.2 (m)(1)(ii)\                    15.2.2.5 (o)(2)(ii)(E)\
  13.1.3 (m)(1)(iii)\                   15.2.2.6 (o)(2)(ii)(F)\
  13.2 (m)(2)\                          15.2.3 (o)(2)(iii)\
  \                                     15.2.3.1 (o)(2)(iii)(A)\
  14. (n)\                              15.2.3.1.1 (o)(2)(iii)(A)(*1*)\
  14.1 (n)(1)\                          15.2.3.1.2 (o)(2)(iii)(A)(*2*)\
  14.2 (n)(2)\                          15.2.3.1.3 (o)(2)(iii)(A)(*3*)\
  14.3 (n)(3)\                          15.2.3.1.4 (o)(2)(iii)(A)(*4*)\
  14.4 (n)(4)\                          15.2.3.1.5 (o)(2)(iii)(A)(*5*)\
  14.4.1 (n)(4)(i)\                     15.2.3.1.6 (o)(2)(iii)(A)(*6*)\
  14.4.2 (n)(4)(ii)\                    15.2.3.1.7 (o)(2)(iii)(A)(*7*)\
  14.4.3 (n)(4)(iii)                    15.2.3.1.8 (o)(2)(iii)(A)(*8*)

  ------------------------------------- ---------------------------------

  ------------------------------------ ----------------------------- ---------------------------------
  **[1753E-001]{.underline}**                                        **[1753E-001]{.underline}**
  **[1755.522]{.underline}**\                                        **[1755.522]{.underline}**\
  \                                                                  \
  15.2.3.1.9 (o)(2)(iii)(A)(*9*)\                                    16.4.1.4 (p)(4)(i)(D)\
  15.2.3.1.10 (o)(2)(iii)(A)(*10*)\                                  16.4.1.5 (p)(4)(i)(E)\
  15.2.3.2 (o)(2)(iii)(B)\                                           16.4.2 (p)(4)(ii)\
  15.2.3.3 (o)(2)(iii)(C)\                                           16.4.3 (p)(4)(iii)\
  15.2.3.4 (o)(2)(iii)(D)\                                           16.4.4 (p)(4)(iv)\
  15.2.3.5 (o)(2)(iii)(E)\                                           \
  15.2.3.6 (o)(2)(iii)(F)\                                           17. (q)\
  15.3 (o)(3)\                                                       17.1 (q)(1)\
  15.3.1 (o)(3)(i)\                                                  17.2 (q)(2)\
  15.3.2 (o)(3)(ii)\                                                 17.3 (q)(3)\
  15.3.3 (o)(3)(iii)\                                                17.3.1 (q)(3)(i)\
  15.3.4 (o)(3)(iv)\                                                 17.3.2 (q)(3)(ii)\
  15.3.5 (o)(3)(v)\                                                  17.3.3 (q)(3)(iii)\
  15.3.6 (o)(3)(vi)\                                                 17.3.4 (q)(3)(iv)\
  15.3.7 (o)(3)(vii)\                                                17.4 (q)(4)\
  \                                                                  17.4.1 (q)(4)(i)\
  16. (p)\                                                           17.4.2 (q)(4)(ii)\
  16.1 (p)(1)\                                                       17.4.3 (q)(4)(iii)\
  16.1.1 (p)(1)(i)\                                                  17.5 (q)(5)\
  16.1.2 (p)(1)(ii)\                                                 17.6 (q)(6)\
  16.1.3 (p)(1)(iii)\                                                17.7 (q)(7)\
  16.1.4 (p)(1)(iv)\                                                 17.7.1 (q)(7)(i)\
  16.1.5 (p)(1)(v)\                                                  17.7.2 (q)(7)(ii)\
  16.1.6 (p)(1)(vi)\                                                 17.7.2.1 (q)(7)(ii)(A)\
  16.1.7 (p)(1)(vii)\                                                17.7.2.2 (q)(7)(ii)(B)\
  16.2 (p)(2)\                                                       17.7.2.3 (q)(7)(ii)(C)\
  16.2.1 (p)(2)(i)\                                                  17.7.2.4 (q)(7)(ii)(D)\
  16.2.2 (p)(2)(ii)\                                                 17.7.2.5 (q)(7)(ii)(E)\
  16.2.3 (p)(2)(iii)\                                                17.7.3 (q)(7)(iii)\
  16.2.4 (p)(2)(iv)\                                                 17.7.4 (q)(7)(iv)\
  16.2.5 (p)(2)(v)\                                                  17.7.5 (q)(7)(v)\
  16.2.5.1 (p)(2)(v)(A)\                                             17.8 (q)(8)\
  16.2.5.2 (p)(2)(v)(B)\                                             17.9 (q)(9)\
  16.2.5.3 (p)(2)(v)(C)\                                             17.10 (q)(10)\
  16.2.6 (p)(2)(vi)\                                                 17.11 (q)(11)\
  16.2.6.1 (p)(2)(vi)(A)\                                            17.12 (q)(12)\
  16.2.6.2 (p)(2)(vi)(B)\                                            17.13 (q)(13)\
  16.2.6.3 (p)(2)(vi)(C)\                                            17.13.1 (q)(13)(i)\
  16.2.6.4 (p)(2)(vi)(D)\                                            17.13.2 (q)(13)(ii)\
  16.2.7 (p)(2)(vii)\                                                17.14 (q)(14)\
  16.3 (p)(3)\                                                       17.15 (q)(15)\
  16.3.1 (p)(3)(i)\                                                  17.16 (q)(16)\
  16.3.2 (p)(3)(ii)\                                                 17.17 (q)(17)\
  16.3.3 (p)(3)(iii)\                                                17.18 (q)(18)\
  16.3.4 (p)(3)(iv)\                                                 \
  16.4 (p)(4)\                                                       18. (r)\
  16.4.1 (p)(4)(i)\                                                  18.1 (r)(1)\
  16.4.1.1 (p)(4)(i)(A)\                                             18.2 (r)(2)\
  16.4.1.2 (p)(4)(i)(B)\                                             18.3 (r)(3)\
  16.4.1.3 (p)(4)(i)(C)                                              18.4 (r)(4)\
                                                                     18.5 (r)(5)

  **[1753E-001]{.underline}**          **[1753E-001]{.underline}**   
  **[1755.522]{.underline}**\          **[1755.522]{.underline}**\   
  \                                    \                             
  18.6 (r)(6)\                         19.5.3 (s)(5)(iii)\           
  18.7 (r)(7)\                         19.5.3.1 (s)(5)(iii)(A)\      
  18.7.1 (r)(7)(i)\                    19.5.3.2 (s)(5)(iii)(B)\      
  18.7.2 (r)(7)(ii)\                   19.5.3.3 (s)(5)(iii)(C)\      
  18.7.3 (r)(7)(iii)\                  19.5.4 (s)(5)(iv)\            
  18.7.4 (r)(7)(iv)\                   19.5.5 (s)(5)(v)\             
  18.7.5 (r)(7)(v)\                    19.5.6 (s)(5)(vi)\            
  18.7.6 (r)(7)(vi)\                   19.6 (s)(6)\                  
  18.7.7 (r)(7)(vii)\                  19.6.1 (s)(6)(i)\             
  \                                    19.6.2 (s)(6)(ii)\            
  \                                    19.7 (s)(7)\                  
  19. (s)\                             19.7.1 (s)(7)(i)\             
  19.1 (s)(1)\                         \                             
  19.2 (s)(2)\                         19.7.2 (s)(7)(ii)\            
  19.2.1 (s)(2)(i)\                    19.7.3 (s)(7)(iii)\           
  19.2.2 (s)(2)(ii)\                   19.7.4 (s)((7)iv)\            
  19.2.3 (s)(2)(iii)\                  \                             
  19.2.4 (s)(2)(iv)\                   20. (t)\                      
  19.2.5 (s)(2)(v)\                    20.1 (t)(1)\                  
  19.2.6 (s)(2)(vi)\                   20.2 (t)(2)\                  
  19.2.7 (s)(2)(vii)\                  20.3 (t)(3)\                  
  19.2.8 (s)(2)(viii)\                 20.4 (t)(4)\                  
  19.3 (s)(3)\                         20.5 (t)(5)\                  
  19.3.1 (s)(3)(i)\                    20.6 (t)(6)\                  
  19.3.2 (s)(3)(ii)\                   20.7 (t)(7)\                  
  19.3.3 (s)(3)(iii)\                  20.8 (t)(8)\                  
  19.3.4 (s)(3)(iv)\                   20.9 (t)(9)\                  
  19.3.5 (s)(3)(v)\                    20.10 (t)(10)\                
  19.3.6 (s)(3)(vi)\                   20.11 (t)(11)\                
  19.3.7 (s)(3)(vii)\                  \                             
  19.3.8 (s)(3)(viii)\                 21. (u)\                      
  19.3.8.1 (s)(3)(viii)(A)\            21.1 (u)(1)\                  
  19.3.8.2 (s)(3)(viii)(B)\            21.1.1 (u)(1)(i)\             
  19.4 (s)(4)\                         21.1.2 (u)(1)(ii)\            
  19.4.1 (s)(4)(i)\                    21.1.3 (u)(1)(iii)\           
  19.4.2 (s)(4)(ii)\                   21.1.3.1 (u)(1)(iii)(A)\      
  19.4.2.1 (s)(4)(ii)(A)\              21.1.3.2 (u)(1)(iii)(B)\      
  19.4.2.2 (s)(4)(ii)(B)\              21.1.3.3 (u)(1)(iii)(C)\      
  19.4.2.3 (s)(4)(ii)(C)\              21.1.3.4 (u)(1)(iii)(D)\      
  19.4.2.4 (s)(4)(ii)(D)\              21.1.3.5 (u)(1)(iii)(E)\      
  19.5 (s)(5)\                         21.1.4 (u)(1)(iv)\            
  19.5.1 (s)(5)(i)\                    21.1.4.1 (u)(1)(iv)(A)\       
  19.5.1.1 (s)(5)(i)(A)\               21.1.4.2 (u)(1)(iv)(B)\       
  19.5.1.2 (s)(5)(i)(B)\               21.1.4.3 (u)(1)(iv)(C)\       
  19.5.1.2.1 (s)(5)(i)(B)(*1*)\        21.1.4.4 (u)(1)(iv)(D)\       
  19.5.1.2.2 (s)(5)(i)(B)(*2*)\        21.1.4.5 (u)(1)(iv)(E)\       
  19.5.2 (s)(5)(ii)\                   21.1.5 (u)(1)(v)\             
  19.5.2.1 (s)(5)(ii)(A)\              21.1.5.1 (u)(1)(v)(A)\        
  19.5.2.2 (s)(5)(ii)(B)\              21.1.5.2 (u)(1)(v)(B)\        
  19.5.2.3 (s)(5)(ii)(C)\              21.1.5.3 (u)(1)(v)(C)\        
  19.5.2.4 (s)(5)(ii)(D)               21.1.5.4 (u)(1)(v)(D)         

  **[1753E-001]{.underline}**                                        **[1753E-001]{.underline}**
  **[1755.522]{.underline}**\                                        **[1755.522]{.underline}**\
  \                                                                  \
  21.2 (u)(2)\                                                       24. (x)\
  21.3 (u)(3)\                                                       24.1 (x)(1)\
  21.4 (u)(4)\                                                       24.1.1 (x)(1)(i)\
  21.5 (u)(5)\                                                       24.1.2 (x)(1)(ii)\
  21.5.1 (u)(5)(i)\                                                  24.1.3 (x)(1)(iii)\
  21.5.2 (u)(5)(ii)\                                                 24.2 (x)(2)\
  21.6 (u)(6)\                                                       24.3 (x)(3)\
  \                                                                  24.3.1 (x)(3)(i)\
  22. (v)\                                                           24.3.1.1 (x)(3)(i)(A)\
  22.1 (v)(1)\                                                       24.3.1.2 (x)(3)(i)(B)\
  22.2 (v)(2)\                                                       24.3.1.3 (x)(3)(i)(C)\
  22.2.1 (v)(2)(i)\                                                  24.3.1.4 (x)(3)(i)(D)\
  22.2.2 (v)(2)(ii)\                                                 24.3.1.5 (x)(3)(i)(E)\
  22.2.3 (v)(2)(iii)\                                                24.3.1.6 (x)(3)(i)(F)\
  \                                                                  24.3.1.7 (x)(3)(i)(G)\
  22.2.4 (v)(2)(iv)\                                                 24.3.1.8 (x)(3)(i)(H)\
  22.3 (v)(3)\                                                       24.3.1.9 (x)(3)(i)(I)\
  22.4 (v)(4)\                                                       24.3.2 (x)(3)(ii)\
  22.5 (v)(5)\                                                       24.3.2.1 (x)(3)(ii)(A)\
  22.6 (v)(6)\                                                       24.3.2.2 (x)(3)(ii)(B)\
  22.7 (v)(7)\                                                       24.3.2.3 (x)(3)(ii)(C)\
  22.8 (v)(8)\                                                       24.3.2.4 (x)(3)(ii)(D)\
  \                                                                  24.3.2.5 (x)(3)(ii)(E)\
  23. (w)\                                                           24.3.2.6 (x)(3)(ii)(F)\
  23.1 (w)(1)\                                                       24.3.2.7 (x)(3)(ii)(G)\
  23.2 (w)(2)\                                                       24.3.2.8 (x)(3)(ii)(H)\
  23.3 (w)(3)\                                                       24.3.2.9 (x)(3)(ii)(I)\
  23.3.1 (w)(3)(i)\                                                  24.3.2.10 (x)(3)(ii)(J)\
  23.3.2 (w)(3)(ii)\                                                 24.4 (x)(4)\
  23.3.3 (w)(3)(iii)\                                                24.5 (x)(5)\
  23.4 (w)(4)\                                                       24.6 (x)(6)\
  23.4.1 (w)(4)(i)\                                                  24.6.1 (x)(6)(i)\
  23.4.2 (w)(4)(ii)\                                                 24.6.1.1 (x)(6)(i)(A)\
  23.5 (w)(5)\                                                       24.6.1.2 (x)(6)(i)(B)\
  23.6 (w)(6)\                                                       24.6.1.3 (x)(6)(i)(C)\
  23.6.1 (w)(6)(i)\                                                  24.6.1.4 (x)(6)(i)(D)\
  23.6.2 (w)(6)(ii)\                                                 24.6.1.5 (x)(6)(i)(E)\
  23.6.2.1 (w)(6)(ii)(A)\                                            24.6.1.6 (x)(6)(i)(F)\
  23.6.2.2 (w)(6)(ii)(B)\                                            24.6.1.7 (x)(6)(i)(G)\
  23.6.2.2.1 (w)(6)(ii)(B)(*1*)\                                     24.6.2 (x)(6)(ii)\
  23.6.2.2.2 (w)(6)(ii)(B)(*2*)\                                     24.6.3 (x)(6)(iii)\
  23.6.3 (w)(6)(iii)\                                                24.6.4 (x)(6)(iv)\
  23.6.3.1 (w)(6)(iii)(A)\                                           24.6.5 (x)(6)(v)\
  23.6.3.2 (w)(6)(iii)(B)\                                           24.6.6 (x)(6)(vi)\
  23.6.3.2.1 (w)(6)(iii)(B)(*1*)\                                    24.6.7 (x)(6)(vii)\
  23.6.3.2.2 (w)(6)(iii)(B)(*2*)\                                    24.7 (x)(7)\
  23.6.3.2.3 (w)(6)(iii)(B)(*3*)\                                    24.8 (x)(8)\
  23.6.3.2.4 (w)(6)(iii)(B)(*4*)\                                    24.9 (x)(9)
  23.7 (w)(7)                                                        
  ------------------------------------ ----------------------------- ---------------------------------

**BULLETIN TO CFR PARAGRAPH NUMBER CROSS-REFERENCE**

PART II INSTALLATION

  ------------------------------------- ---------------------------------
  **[1753E-001]{.underline}**           **[1753E-001]{.underline}**
  **[1755.522]{.underline}**\           **[1755.522]{.underline}**\
  \                                     \
  1. (y)\                               1.2.12 (y)(2)(xii)\
  1.1 (y)(1)\                           1.2.13 (y)(2)(xiii)\
  1.1.1 (y)(1)(i)\                      1.2.14 (y)(2)(xiv)\
  1.1.2 (y)(1)(ii)\                     1.2.15 (y)(2)(xv)\
  1.1.3 (y)(1)(iii)\                    1.2.16 (y)(2)(xvi)\
  1.1.4 (y)(1)(iv)\                     1.2.17 (y)(2)(xvii)\
  1.1.5 (y)(1)(v)\                      1.2.18 (y)(2)(xviii)\
  1.1.6 (y)(1)(vi)\                     1.3 (y)(3)\
  1.1.7 (y)(1)(vii)\                    1.3.1 (y)(3)(i)\
  1.1.8 (y)(1)(viii)\                   1.3.2 (y)(3)(ii)\
  1.1.9 (y)(1)(ix)\                     1.3.3 (y)(3)(iii)\
  1.1.10 (y)(1)(x)\                     1.3.3.1 (y)(3)(iii)(A)\
  1.1.11 (y)(1)(xi)\                    1.3.3.2 (y)(3)(iii)(B)\
  1.1.12 (y)(1)(xii)\                   1.3.3.3 (y)(3)(iii)(C)\
  1.1.13 (y)(1)(xiii)\                  1.3.3.4 (y)(3)(iii)(D)\
  1.1.14 (y)(1)(xiv)\                   1.4 (y)(4)\
  1.2 (y)(2)\                           1.4.1 (y)(4)(i)\
  1.2.1 (y)(2)(i)\                      1.4.2 (y)(4)(ii)\
  1.2.2 (y)(2)(ii)\                     1.4.3 (y)(4)(iii)\
  1.2.3 (y)(2)(iii)\                    1.5 (y)(5)\
  1.2.4 (y)(2)(iv)\                     1.5.1 (y)(5)(i)\
  1.2.5 (y)(2)(v)\                      1.5.2 (y)(5)(ii)\
  1.2.6 (y)(2)(vi)\                     1.5.3 (y)(5)(iii)\
  1.2.7 (y)(2)(vii)\                    1.5.4 (y)(5)(iv)\
  1.2.8 (y)(2)(viii)\                   1.5.5 (y)(5)(v)\
  1.2.9 (y)(2)(ix)\                     1.5.6 (y)(5)(vi)\
  1.2.10 (y)(2)(x)\                     1.5.7 (y)(5)(vii)
  1.2.11 (y)(2)(xi)                     

  ------------------------------------- ---------------------------------

Parts III through VI of Bulletin 1753E-001 and Appendices A through D of
7 CFR 1755.522 are numbered identically.

**PART I**

**General Specification**

**1. GENERAL**

**1.1** This bulletin 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.

**1.2** 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.

**1.3** 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 N. Capitol Street NW., Suite 700, Washington, DC 20001.

**1.4** 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 N. Capitol Street NW.,
Suite 700, Washington, DC 20001.

**1.5** 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 N. Capitol Street NW., Suite 700,
Washington, DC 20001.

**1.6** 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 N. Capitol Street NW.,
Suite 700, Washington, DC 20001.

**1.7** 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 N. Capitol Street NW., Suite 700, Washington, DC
20001.

**1.8** 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 N. Capitol Street
NW., Suite 700, Washington, DC 20001.

**1.9** 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 N. Capitol Street
NW., Suite 700, Washington, DC 20001.

**1.10** 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 Electrification Administration,
Administrative Services Division, room 0175-S, Washington, DC 20250. The
bulletin may be inspected at the Office of the Federal Register, 800 N.
Capitol Street NW., Suite 700, Washington, DC 20001.

**1.11** 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
Electrification Administration, Administrative Services Division, room
0175-S, Washington, DC 20250. The bulletin may be inspected at the
Office of the Federal Register, 800 N. Capitol Street NW., Suite 700,
Washington, DC 20001.

**1.12** RUS Bulletin 345-87, PE‑87, RUS Specification for Terminating
(TIP) Cable, December 1983, 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 Electrification Administration,
Administrative Services Division, room 0175-S, Washington, DC 20250. The
bulletin may be inspected at the Office of the Federal Register, 800 N.
Capitol Street NW., Suite 700, Washington, DC 20001.

**2. RELIABILITY**

**2.1** 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.

**2.2** 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.

**2.3** 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.

**3. SYSTEM TYPE ACCEPTANCE TESTS**

**3.1** 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 bulletin.
However, any installation of a system provided in accordance with this
bulletin shall be capable of meeting any requirement in this bulletin on
a spot‑check basis.

**3.2** 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.

**3.3** 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.

**4. TYPES OF REQUIREMENTS**

**4.1** Unless otherwise indicated, the requirements listed in this
bulletin are fixed requirements.

**4.2** 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.\"

**4.3** In some cases where an optional feature specified in paragraph 5
of this bulletin 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 bulletin for the specific installation
under consideration, but not in compliance with the entire bulletin.

**4.4** The owner may request bids from any RUS accepted supplier whose
system provides all the features which will be required for a specific
installation.

**4.5** 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 Parts III and IV of this
bulletin.

**5. GENERAL REQUIREMENTS**

**5.1** 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.

**5.2** 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.

**5.3** 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.

**5.4** 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.

**5.5** 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 Part III of this bulletin.

**5.6** The requirements in this specification apply only to single
party lines. Although only single frequency ringing is required, other
types may be requested in Part III of this bulletin.

**5.7** 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.

**5.8** Tandem switching features shall be provided if specified in Part
III of this bulletin.

**5.9** 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 Part III of this bulletin.

**5.10** 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 Part V of
this bulletin, data satisfactory to RUS regarding the busy hour load
handling capacity and traffic delays of the system.

**5.11** 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, Part III of this bulletin).

**5.12** Provision shall be made to identify the calling line or
incoming trunk on nuisance calls (see paragraph 7.10 of this bulletin
for details).

**5.13** Full access from every subscriber line to every interoffice
trunk shall be provided.

**5.14** 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 Part III of this bulletin.

**5.15** 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.

**5.16** 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 23 of this bulletin). 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.

**5.17** 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, Part III of this bulletin (see paragraph 10 of this
bulletin).

**5.18** 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.

**5.19** When specified in Part III of this bulletin, 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.

**5.19.1** It shall be possible to reach the service bureau by dialing
911, 1+911, or a 7‑digit number.

**5.19.2** The system shall select an idle 911 line or trunk.

**5.19.3** The system shall provide usual ringing and ringback signal
until the called 911 line answers.

**5.19.4** 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.

**5.19.5** 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.

**5.19.6** 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.

**5.19.7** 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.

**5.19.8** 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.

**5.19.9** If 911 calls pass through intermediate switching, the
forced‑hold control, emergency ringback, and calling line status
monitoring capabilities are lost.

**6. LINE CIRCUIT REQUIREMENTS**

**6.1 [General]{.underline}**

**6.1.1** 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.

**6.1.2** 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.

**6.2 [Dialing]{.underline}**

**6.2.1** 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.

**6.2.2** 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.

**6.2.3** Subscriber Line Pushbutton Dialing Frequencies: The frequency
pairs assigned for pushbutton dialing shall be as follows, with an
allowable variation of [+]{.underline} 1.5 percent:

  ----------------------------------------- ------------- ------- ------- -------
  Low Group                                 High Group                    

  Frequencies (Hz)                          Frequencies                   
                                            (Hz)                          

                                            1209          1336    1477    1633

  697                                       1             2       3       Spare

  770                                       4             5       6       Spare

  852                                       7             8       9       Spare

  941                                       \*            0       \#      Spare
  ----------------------------------------- ------------- ------- ------- -------

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.

**6.3 [Impedance]{.underline}:** For the purpose of this bulletin, the
input impedance of all subscriber loops served by the equipment is
arbitrarily considered to be 900 ohms at voice frequencies.

**6.4 [Lockout]{.underline}**

**6.4.1** 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 9.2.11 of this bulletin) or a howler circuit (see
paragraph 15.2.3.3 of this bulletin) shall be applied to the line.

**6.4.2** The line on lockout shall be reconnected automatically to the
central office when the permanent off‑hook condition is cleared.

**6.5 [Pay Stations]{.underline}:** Pay stations may be prepay, or
semi‑postpay, as specified by the owner.

**6.6 [Loop Extension]{.underline}**

**6.6.1** 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.

**6.6.2** 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.

**6.6.3** 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.

**6.7 [Private Branch Exchange (PBX) Lines]{.underline}:** PBX trunk
hunting shall be available. It will not be necessary to segregate PBX
lines to certain line groups.

**6.8 [Quantity]{.underline}:** 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.

**6.9 [Types]{.underline}:** There shall be provisions for types of
lines such as ground start, loop start, regular subscriber, pay
stations, etc.

**7. Intraoffice switching requirements**

**7.1** The switching system shall:

**7.1.1** 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;

**7.1.2** Remove dial tone immediately after the first digit has been
dialed;

**7.1.3** Recognize the class of service of the calling subscriber;

**7.1.4** Register the digits dialed by the calling subscriber where the
rotary dial or pushbutton dialing characteristics and the minimum
interdigital times are as specified;

**7.1.5** 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;

**7.1.6** Provide a transmission path from the calling subscriber line
to the selected trunk, if an idle one is found;

**7.1.7** 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 9.2.4 of this bulletin) to the subscriber if no trunks are
available in the last choice alternate route;

**7.1.8** 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;

**7.1.9** 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;

**7.1.10** Register all the digital information on calls incoming from a
distant office, when dial or MF pulsing characteristics and interdigital
times are as specified;

**7.1.11** Translate internally a registered directory number into line
equipment location, ringing code and terminating class (such as \"PBX
hunting\") on incoming or intraoffice calls;

**7.1.12** Test the called line for a busy condition;

**7.1.13** Connect the incoming trunk or locally originated call to the
called line if the called line is idle;

**7.1.14** 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

**7.1.15** Test and monitor the switching system continually during
periods of low traffic using the maintenance and diagnostic subsystem.

**7.2** 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:

**7.2.1** Flat rate individual line, bridged ringing;

**7.2.2** Flat rate PBX and trunk hunting numbers, bridged ringing;

**7.2.3** Pay station;

**7.2.4** Message rate subscriber line;

**7.2.5** Wide Area Telephone Service (WATS);

**7.2.6** Extended Area Service (EAS);

**7.2.7** Data service;

**7.2.8** Hotel‑Motel capability;

**7.2.9** Denied originating;

**7.2.10** Denied terminating;

**7.2.11** Custom calling features;

**7.2.12** Special interexchange carrier accesses; and

**7.2.13** Presubscription to designated interexchange carrier.

**7.3** The switching system shall provide PBX hunting.

**7.3.1** At least one trunk hunting group in each 100 SDN\'s equipped
shall be provided. More may be provided as specified by the owner.

**7.3.2** PBX groups shall be of a reasonable size commensurate with the
ultimate size of the switching system.

**7.3.3** Any available SDN may be used for PBX trunk hunting.

**7.3.4** Each PBX group shall have the capability of being assigned one
or more nonhunting SDN\'s for night service.

**7.3.5** 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.

**7.3.6** If the called PBX group is busy, line busy tone, as specified
in paragraph 9.2.3 of this bulletin, shall be returned to the
originating end of the connection.

**7.4** 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.

**7.5** To meet dialing requirements, the switching system shall:

**7.5.1** Initiate the line lockout function after a delay, as specified
in paragraph 18.3 of this bulletin, 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;

**7.5.2** 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 18.4 of this
bulletin elapses between dialed digits;

**7.5.3** 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

**7.5.4** 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.

**7.6** The switching system shall provide for appropriate circuit
usage.

**7.6.1** 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.

**7.6.2** 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.

**7.6.3** 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.

**7.6.4** 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.

**7.6.5** 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.

**7.6.6** 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.

**7.7** The switching system shall provide busy verification facilities
with the method of access specified by the owner.

**7.7.1** Only an operator or a switchman shall be able to override a
busy line condition.

**7.7.2** If the called line is busy, off‑hook supervision shall be
given the operator or switchman.

**7.7.3** 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.

**7.7.4** When a verification code is used, all digits of the code must
be dialed before cut‑through to the called line can be accomplished.

**7.8** The switching system shall provide intercept facilities.

**7.8.1** 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.

**7.8.2** Unequipped SDN\'s intercept shall be effective if the
processor memory does not have information concerning the SDN in
question.

**7.8.3** The intercept equipment shall be arranged so that specific
SDN\'s can be routed to a separate intercept circuit for changed
numbers.

**7.8.4** 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.

**7.8.5** 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 9.2.10 of this bulletin.

**7.9** 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.

**7.10** The switching system shall follow appropriate release
procedures.

**7.10.1** 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.

**7.10.2** 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
18.7 of this bulletin has elapsed. This feature shall not interfere with
the normal operation of calls to intercept, fire alarm, or other special
services.

**7.11** 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.

**7.11.1** 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.

**7.11.2** Procedures shall be established to avoid the unauthorized use
of the line load control facilities.

**7.11.3** 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.

**8. Interoffice trunk circuit requirements**

**8.1 [General]{.underline}**

**8.1.1** 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.

**8.1.2** Trunks shall not be directly driven from the subscriber\'s
dial on outward calls.

**8.1.3** 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.

**8.1.4** 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.

**8.2 [Quantity]{.underline}:** Trunk quantities shall be as specified
in Part III of this bulletin. 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.

**8.3 [Requirements for Interoffice Connections]{.underline}**

**8.3.1** 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 9.2.5 of this bulletin and shall be connected to be heard only
by the operator upon answer. It shall be possible to repeat the tone
signal.

**8.3.2** 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.

**8.3.3** 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.

**8.3.4** On calls originated by an operator, the release of the
connection shall be under control of the operator.

**8.3.5** 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.

**8.3.6** 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 18.5 of this bulletin.

**8.3.7** When necessary, provision shall be made for reception of start
and stop dial signals on toll trunk equipment.

**8.3.8** 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 11 of this bulletin applicable to such
functions.

**8.4 [Requirements for Direct Digital Connections]{.underline}**

**8.4.1** 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.

**8.4.2** 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 [+]{.underline} 0.5
seconds. Loss of synchronization shall be detected by slips, timing
jitter, and wander in accordance with industry standards.

**8.4.3** 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.

**9. Tone requirements**

**9.1 [General]{.underline}:** 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.

**9.2 [Tone Specifications]{.underline}**

**9.2.1** 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.

**9.2.2** Low tone shall consist of 480 Hz plus 620 Hz at a composite
level of ‑21 dBm0 which equates to ‑24 dBm0 per frequency.

**9.2.3** Line busy tone shall be low tone interrupted at 60 IPM, with
tone on 0.5 seconds and off 0.5 seconds.

**9.2.4** 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.

**9.2.5** Identifying tone on calls from coin lines shall be
uninterrupted low tone.

**9.2.6** High tone shall consist of 480 Hz at ‑17 dBm0.

**9.2.7** Audible ringback tone shall consist of 440 plus 480 Hz at a
composite level of ‑16 dBm0 which equates to ‑19 dBm0 per frequency.

**9.2.8** The call progress tones listed in this bulletin 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
[+]{.underline} 0.5 percent frequency tolerance and [+]{.underline} 3 dB
amplitude variation. The amplitude levels specified are to be measured
at the main distributing frame, excluding cable loss.

**9.2.9** 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.

**9.2.10** 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.

**9.2.11** 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.)

**9.2.12** During application of tones, office longitudinal balance
shall be maintained within 15 dB of that specified in paragraph 17.8 of
this bulletin.

**10. System clock**

**10.1** 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).

**10.2** The end office central office system clock shall be a Stratum 3
clock with:

**10.2.1** A minimum long‑term accuracy of [+]{.underline}4.6 x 10‑6
([+]{.underline}7 Hz @ 1.544 MHz);

**10.2.2** A minimum stability of 3.7 x 10‑7/day upon loss of all
frequency references; and

**10.2.3** A \"Pull‑In Range\" for the capability of synchronizing to a
clock with accuracy of [+]{.underline}4.6 x 10‑6.

**10.3** The access tandem central office system clock shall be a
Stratum 2 clock with:

**10.3.1** A minimum long‑term accuracy of [+]{.underline}1.6 x
10‑8([+]{.underline}0.025 Hz @ 1.544 MHz);

**10.3.2** A minimum stability of 1 x 10‑10/day upon loss of all
frequency references; and

**10.3.3** A \"Pull‑In Range\" for the capability of synchronization to
a clock with accuracy of [+]{.underline}1.6 x 10‑8.

**11. Switched access service arrangements**

**11.1 [General]{.underline}:** 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).

**11.2 [Operation]{.underline}**

**11.2.1** All equipment shall be arranged for Feature Group A (Line
Side Connection).

**11.2.2** All equipment shall be arranged for Feature Group B given
that Part III of this bulletin requires the equipment of the necessary
trunks (Trunk Side Connection).

**11.2.3** The equipment shall be arranged for Feature Group C on the
trunk groups specified in Part III of this bulletin. Even though Part
III of this bulletin 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.

**11.2.4** The equipment shall be arranged for Feature Group D on the
trunk groups specified in Part III of this bulletin.

**11.2.5** 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.

**11.2.6** 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 Part III of this bulletin.

**11.2.7** The equipment shall be arranged for AMA data collection as
specified in Part III of this bulletin 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.

**11.2.8** If specified in Item 9.4, Part III of this bulletin, the
equipment shall be arranged to store the billing data in a pollable
system. If specified in Item 9.5, Part III of this bulletin, equipment
shall be furnished to poll the pollable systems associated with the
contract.

**12. Fusing and protection requirements**

**12.1 [General]{.underline}**

**12.1.1** 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.

**12.1.2** 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.

**12.2 [Fuses]{.underline}:** 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.

**12.3 [Components]{.underline}**

**12.3.1** 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.

**12.3.2** 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.

**12.3.3** 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 Part V of
this bulletin).

**13. Switching network requirements**

**13.1 [The Network]{.underline}**

**13.1.1** All networks shall be comprised of solid‑state components.

**13.1.2** The switching network shall employ time division digital
switching and be compatible for connection to D3 type PCM channel banks
without conversion to analog.

**13.1.3** 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.

**13.2 [Network Quantity]{.underline}:** 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 Part III of this
bulletin. This does not imply the necessity of supplying empty cabinets
unless this is the only way the necessary wiring can be accomplished.

**14. Stored program control (SPC) equipment requirements**

**14.1** 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.

**14.2** 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.

**14.3** 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.

**14.4** The switching system shall be able to offer, by request, at
least the following printouts of its routine stored data for
administrative purposes:

**14.4.1** A list of all assigned directory numbers, in numerical order,
with their assigned class of service and line terminal numbers;

**14.4.2** A list of all directory numbers, in numerical order,
associated with a class of service;

**14.4.3** A list of all unassigned line terminals;

**14.4.4** Traffic data in proper form for separation studies in
accordance with the revenue separations procedures current at the time
of the contract;

**14.4.5** All lines on lockout;

**14.4.6** All lines assigned to intercept;

**14.4.7** All available (unassigned) directory numbers in the working
thousands group; and

**14.4.8** A list of equipment busied out for maintenance.

**14.5** The printouts in paragraph 14.4 of this bulletin may be delayed
to times of light traffic.

**14.6** 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.

**14.7** 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.

**15. Maintenance facilities**

**15.1 [Alarm Features, Including Alarm Sending]{.underline}**

**15.1.1** 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.

**15.1.2** The alarms shall be classified in accordance with their
effect on the system.

**15.1.2.1** 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.

**15.1.2.2** 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.

**15.1.2.3** 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.

**15.1.3** When the office is arranged for unattended operation,
facilities shall be provided for extending the alarm indications to an
attended point.

**15.1.4** 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.

**15.1.5** 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 Part III
of this bulletin. 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.

**15.1.6** 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.

**15.1.7** The alarm sending circuit shall have access to two or more
trunks if the trunks are used for subscriber traffic.

**15.1.8** An alarm indication of higher priority shall supersede an
original alarm indication and reseize an interoffice operator trunk.

**15.1.9** In any group of offices purchased under one contract, the
same codes shall be used in each office for alarm checking and test.

**15.1.10** When the alarm checking number is dialed, the alarm
indications received shall be as follows:

**15.1.10.1** Catastrophic alarm - No tone.

**15.1.10.2** Major alarm - Continuous busy tone 60 IPM, unless alarm is
overridden.

**15.1.10.3** Minor alarm - Continuous 1‑ring code ringback tone, unless
alarm is overridden.

**15.1.10.4** No trouble - Continuous 2‑ring code ringback tone, unless
alarm is overridden.

**15.1.11** Audible and visual local alarms and transmitted alarms shall
be provided as follows:

+-----------------------+-----------------------+-----------------------+
|                       | Delay Interval        |                       |
+-----------------------+-----------------------+-----------------------+
| Classification        | Local Alarms          | Alarms Transmitted    |
+-----------------------+-----------------------+-----------------------+
| > Catastrophic        | 0                     | > 0                   |
+-----------------------+-----------------------+-----------------------+
| > Major               | 0                     | > 0^1^                |
+-----------------------+-----------------------+-----------------------+
| > Minor               | 0                     | > 0 - 30 Min.         |
+-----------------------+-----------------------+-----------------------+

1Except no charge alarm delayed 15 minutes.

**15.1.12** 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.

**15.2 [Trouble Location and Test]{.underline}**

**15.2.1** Equipment

**15.2.1.1** 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.

**15.2.1.2** 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.

**15.2.2** Maintenance System

**15.2.2.1** The maintenance system shall monitor and maintain the
system operation without interruption of call processing, except for
major failures.

**15.2.2.2** 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.

**15.2.2.3** 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.

**15.2.2.4** 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.

**15.2.2.5** Facilities shall be provided so that test calls can be set
up using pre‑selected items of switching equipment.

**15.2.2.6** 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.

**15.2.3** Outside Plant and Subscriber Stations

**15.2.3.1** 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 Part III of this bulletin. 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:

**15.2.3.1.1** Test for bridged foreign electromotive force (EMF);

**15.2.3.1.2** Test for regular line battery;

**15.2.3.1.3** Test for booster battery voltage and polarity using the
test shoe;

**15.2.3.1.4** Test for open circuits, short, tip ground, and ring
ground;

**15.2.3.1.5** Test for tip or ring negative potential;

**15.2.3.1.6** Test for capacitance of a subscriber\'s line;

**15.2.3.1.7** Supply talking battery to the line with and without
booster battery;

**15.2.3.1.8** Ring the subscriber through the test access circuit or
through a test shoe;

**15.2.3.1.9** Test in and out of the central office; and

**15.2.3.1.10** Supply a reverse polarity key for voltage readings,
except when positive or negative values are displayed directly.

**15.2.3.2** An acceptable arrangement for making the tests shown in
paragraph 15.2.3.1 of this bulletin is to have them under software
control with results displayed at one of the system\'s I/O ports.

**15.2.3.3** 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.

**15.2.3.4** 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.

**15.2.3.5** When the office is arranged for pushbutton dialing,
optional facilities shall be provided for testing the pushbutton dialing
equipment at the subscriber station.

**15.2.3.6** 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.

**15.3 [Transmission Testing]{.underline}**

**15.3.1** When transmission test circuits are specified in Item 11.3 of
Part III of this bulletin, 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.

**15.3.2** 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.

**15.3.3** 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 Part III of this bulletin in those situations where
connecting companies request the installation of multifrequency
generators in borrowers\' central offices.

**15.3.4** 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 [+]{.underline} 0.5 dB. For direct digital
connections, the encoded output shall be the digital equivalent of a 0
dBm0 [+]{.underline} 0.5 dB signal.

**15.3.5** 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.

**15.3.6** Provision shall be made so that the milliwatt supply can be
manually patched to circuits.

**15.3.7** 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.

**16. Traffic**

**16.1 [General Engineering Guidelines]{.underline}**

**16.1.1** 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 traffic capacity in CCS for 1 to 200
trunks at nine grades of service.

TRAFFIC TABLE

Full Availability for Random Traffic

LOST‑CALLS‑CLEARED

Number Offered Traffic Expressed in CCS Number

of of

Trunks B-.001 .002  .005  .01 .02 .05 .1 .2 .5 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

TRAFFIC TABLE

##  Full Availability for Random Traffic

LOST‑CALLS‑CLEARED

Number Offered Traffic Expressed in CCS Number

of of

Trunks B-.001 .002  .005  .01 .02 .05 .1 .2 .5 Trunks

 

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

TRAFFIC TABLE

Full Availability for Random Traffic

LOST‑CALLS‑CLEARED

Number Offered Traffic Expressed in CCS Number

of of

Trunks B-.001 .002  .005  .01 .02 .05 .1 .2 .5 Trunks

 

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

TRAFFIC TABLE

Full Availability for Random Traffic

LOST‑CALLS‑CLEARED

Number Offered Traffic Expressed in CCS Number

of of

Trunks B-.001 .002  .005  .01 .02 .05 .1 .2 .5 Trunks

 

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

**16.1.2** 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.

**16.1.3** 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.

**16.1.4** 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.

**16.1.5** Limited availability is not permitted.

**16.1.6** The traffic capacity in the following table should be used
for small trunk groups such as pay station, special service

trunks, intercept and PBX trunks, unless otherwise specified in Part III
of this bulletin.

  ----------------------------------- -----------------------------------
  Number of Circuits                  Permissible CCS

  1                                   10

  2                                   20

  3                                   30

  4                                   40
  ----------------------------------- -----------------------------------

**16.1.7** 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.

**16.2 [Grade of Service]{.underline}**

**16.2.1** 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.

**16.2.2** 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.

**16.2.3** The average post dialing delay objective for an intraoffice
call shall not exceed 1 second. This includes all connect, operate, and
translation time.

**16.2.4** The line to line (intraoffice) network matching loss
objective shall be 0.02 or less.

**16.2.5** 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:

**16.2.5.1** Subscriber to outgoing trunk objective 0.01 or less;

**16.2.5.2** Incoming trunk to subscriber objective 0.02 or less; and

**16.2.5.3** Local trunk tandem objective 0.01 or less.

**16.2.6** Groups of common service circuits are to be engineered
utilizing the full availability traffic tables that appear in paragraph
16.1.1 of this bulletin at the following stipulated probabilities:

**16.2.6.1** Outgoing trunks to 2/6 MF or dial pulse senders at B.001;

**16.2.6.2** Incoming trunks to 2/6 MF receivers at B.001;

**16.2.6.3** Incoming nondelay dial trunks to receivers at B.001; and

**16.2.6.4** Incoming trunks with start dial at B.01.

**16.2.7** Remote Switching Terminals (RST\'s) shall meet the same grade
of service objectives as the host.

**16.3 [Holding Times]{.underline}:** 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 Part III of this bulletin.

**16.3.1** The following average call holding times (HT) may be used.

+-------------------------------------------------+--------------------+
| > Type of Call                                  | HT - Seconds       |
+-------------------------------------------------+--------------------+
| > Intraoffice                                   | 120                |
+-------------------------------------------------+--------------------+
| > EAS                                           | 150                |
+-------------------------------------------------+--------------------+
| > Special Service, Intercept, Verification      | 60                 |
+-------------------------------------------------+--------------------+
| > Toll, CLR                                     | 300                |
+-------------------------------------------------+--------------------+
| > Toll, S-S                                     | 240                |
+-------------------------------------------------+--------------------+
| > Toll, PPCS                                    | 270                |
+-------------------------------------------------+--------------------+

**16.3.2** The following average subscriber dialing holding times may be
used (times used to dial digits do not include machine time).

+--------------------------------+-----------+-----------+-----------+
|                                | Digits    | DP        | P         |
|                                |           |           | ushbutton |
|                                | Dialed    | Sec.      |           |
|                                |           |           | 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       |
+--------------------------------+-----------+-----------+-----------+

**16.3.3** The following average incoming register holding times may be
used (times for digit registrations do not include machine time).

+---------------------------------+------------+---------+-----------+
|                                 | Basic      |         |           |
+---------------------------------+------------+---------+-----------+
|                                 | Holding    | Digits  | A         |
|                                 |            |         | dditional |
|                                 | Time       |         |           |
|                                 | (Sec.)     |         | 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        | 51      | \-        |
+---------------------------------+------------+---------+-----------+
| Crossbar Tandem                 | 4.9        | 4       | 1.2       |
+---------------------------------+------------+---------+-----------+

1No reduction for fewer digits.

**16.3.4** The following average sender holding times may be used (does
not include machine setup and release time).

+---------------------------------+------------+---------+-----------+
|                                 | Basic      |         |           |
+---------------------------------+------------+---------+-----------+
|                                 | Holding    | Digits  | A         |
|                                 |            |         | dditional |
|                                 | Time       |         |           |
|                                 | (Sec.)     |         | Per Digit |
+---------------------------------+------------+---------+-----------+
| MF Senders:                     |            |         |           |
+---------------------------------+------------+---------+-----------+
| > No. 5 Crossbar                | 1.5        | 4       | 0.14      |
+---------------------------------+------------+---------+-----------+
| > Crossbar Tandem & 4A Toll1    | 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 Pulsing2         | 9.1        | Up to 6 | 1.8       |
+---------------------------------+------------+---------+-----------+
| > Without Overlap Pulsing       | 4.6        | 4       | 1.2       |
+---------------------------------+------------+---------+-----------+

1Add 1.3 seconds for ANI outpulsing on special toll (0+) calls and on
DDD calls if AMA is not provided.

2Assumes overlap outpulsing starting on receiving of third digit;
applies only to calls handled on direct trunk groups.

**16.4 [Traffic Data Requirements]{.underline}**

**16.4.1** Traffic measurements are composed of primarily two types -
counts and usage. The following types of traffic data recording are
required:

**16.4.1.1** [Peg count]{.underline} registers shall be incremented when
a successful network connection is established to a particular circuit
group such as trunks, senders, digital receivers, etc.

**16.4.1.2** [Overflow count]{.underline} registers shall be incremented
when access to a particular circuit group is denied due to all resource
busy condition.

**16.4.1.3** [Network blockage count]{.underline} registers shall be
incremented due to an unavailability of a path in an access or switching
matrix network.

**16.4.1.4** [Usage]{.underline} 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).

**16.4.1.5** [Service delay]{.underline} 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.

**16.4.2** 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 16.4.1 of this
bulletin 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.

**16.4.3** 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.

**16.4.4** All traffic records shall have dates and times and office
identification.

**17. Transmission**

**17.1 [General]{.underline}:** 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.

**17.2 [Impedance]{.underline}:** For the purpose of this bulletin, 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.

**17.3 [Insertion Loss]{.underline}:** 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 77°F [+]{.underline} 9°F (25°C
[+]{.underline} 5°C).

**17.3.1** [Trunk‑to‑Trunk or Trunk‑to‑Line]{.underline}: 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.

**17.3.2** [Line‑to‑Line]{.underline}: The loss shall be set between 0
and 2 dB.

**17.3.3** [Direct Digital Interface]{.underline}: On a direct digital
interface, the loss through the office shall be adjusted to the proper
level in the receive side.

**17.3.4** [Stability]{.underline}: The long‑term allowable variation in
loss through the office shall be [+]{.underline} 0.5 dB from the loss
specified by the bidder.

**17.4 [Frequency Response (Loss Relative to 1004 Hz)]{.underline}**
shall meet the following requirements.

**17.4.1** [Trunk-to-Trunk]{.underline}

  ----------------------- ----------------------- -----------------------
                          Loss at 0 dBm0 Input1   

  Frequency (Hz)          2-Wire to 2-Wire        4-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
  ----------------------- ----------------------- -----------------------

1(-) means less loss and (+) means more loss.

2Transmit End

**17.4.2** [Line-to-Line]{.underline}

  ----------------------------------- -----------------------------------
  Frequency (Hz)                      Loss at 0 dBm0 Input1

  60                                  20 dB Min.2

  300                                 -1 to +3 dB

  600 - 2400                          [+]{.underline}1 dB

  3200                                -1 to +3 dB
  ----------------------------------- -----------------------------------

1(-) means less loss and (+) means more loss.

2Transmit End

**17.4.3** [Trunk-to-Line]{.underline}: The trunk‑to‑line frequency
response requirements shall be a compromise between those values
specified in paragraphs 17.4.1 and 17.4.2 of this bulletin.

**17.5 [Overload level]{.underline}:** The overload level at 900 ohm
impedance shall be +3 dBm0.

**17.6 [Gain Tracking (Linearity)]{.underline}** shall meet the
following requirements.

+-----------------------------------+-----------------------------------+
| Input Signal Level1               | Maximum                           |
|                                   |                                   |
|                                   | Gain Deviation                    |
+-----------------------------------+-----------------------------------+
| +3 to -37 dBm0                    | [+]{.underline}0.5 dB             |
+-----------------------------------+-----------------------------------+
| -37 to -50 dBm0                   | [+]{.underline}1 dB               |
+-----------------------------------+-----------------------------------+

11004 Hz reference at 0 dBm0.

**17.7 [Return Loss]{.underline}**

**17.7.1** 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.

**17.7.2** Far end test terminations shall be as follows:

**17.7.2.1** Loaded line circuit - 1650 ohms in parallel with the series
combination of .005 microfarads and 100 ohms;

**17.7.2.2** Nonloaded line circuit - 800 ohms in parallel with the
series combination of .05 microfarads and 100 ohms;

**17.7.2.3** Special service line circuit including electronic lines and
carrier lines - 900 ohms in series with 2.16 microfarads; and

**17.7.2.4** Two‑wire trunk - 900 ohms in series with 2.16 microfarads.

**17.7.2.5** Four-wire trunk - 600 ohms.

**17.7.3** 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.

**17.7.4** 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.

**17.7.5** 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.

**17.8 [Longitudinal Balance]{.underline}:** 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, 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).

**17.9 [60 Hz Longitudinal Current Immunity]{.underline}:** Under test
conditions with 60 Hz, the system noise shall be no greater than 23
dBrnC0 as measured using the configuration in Figure 1.

**17.10 [Steady Noise]{.underline}** (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.

**17.11 [Impulse Noise]{.underline}:** 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.

**17.12 [Crosstalk Coupling]{.underline}:** 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.

**17.13 [Quantizing Distortion]{.underline}**

**17.13.1** The switching system shall meet the following requirements.

+-----------------------------------+-----------------------------------+
| Input Level (dBm0)                | Minimum Signal to Distortion      |
|                                   |                                   |
| 1004 or 1020 Hz                   | with C-Message Weighting          |
+-----------------------------------+-----------------------------------+
| 0 to -30                          | 33 dB                             |
+-----------------------------------+-----------------------------------+
| -30 to -40                        | 27 dB                             |
+-----------------------------------+-----------------------------------+
| -40 to -45                        | 22 dB                             |
+-----------------------------------+-----------------------------------+

**17.13.2** 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.

**17.14 [Absolute Delay]{.underline}:** 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.

**17.15 [Envelope Delay Distortion]{.underline}:** On any properly
established connection, the envelope delay distortion shall not exceed
the following limits.

  ----------------------------------- -----------------------------------
  Frequency Range (Hz)                Microseconds

  1000 to 2600                        190

  800 to 2800                         350

  600 to 3000                         500

  400 to 3200                         700
  ----------------------------------- -----------------------------------

**17.16 [Digital Error Rate]{.underline}:** 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.

**17.17 [Battery Noise]{.underline}:** Noise across battery at power
board distribution bus terminals shall not exceed 35 dBrnC during the
busy hour.

**17.18 [Radio and Television Interference]{.underline}:** 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.

**18. Timing intervals**

**18.1 [Type of Equipment Required]{.underline}:** The equipment for
providing the specified timing intervals shall be solid‑state.

**18.2 [Tolerance]{.underline}:** 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.

**18.3 [Permanent Signal Timing]{.underline}:** 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.

**18.4 [Partial Dial Timing]{.underline}:** Partial dial timing shall be
within 15 to 37 seconds. This timing may be reduced appreciably during
periods of heavy traffic.

**18.5 [Charge Delay Timing]{.underline}:** Charge delay timing shall be
within 2 seconds.

**18.6 [Called Party Disconnect Timing]{.underline}:** Timed disconnect
of a terminating path under control of the called party shall be 10 to
32 seconds.

**18.7 [Timing Intervals for Signals Involved in Distance
Dialing]{.underline}:** 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:

**18.7.1** Disconnect signal;

**18.7.2** Wink signal;

**18.7.3** Start dialing signal;

**18.7.4** Pulse delay signal;

**18.7.5** Go signal;

**18.7.6** Digit timing; and

**18.7.7** Sender, register, and link attachment timing.

**19. Power requirements and equipment**

**19.1 [Operating Voltage]{.underline}:** 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.

**19.2 [Batteries]{.underline}**

**19.2.1** When battery cells of the lead antimony type are specified,
the pasted plate type shall be considered adequate.

**19.2.2** When lead calcium cells are specified, no cell shall differ
from the average voltage of the string of fully charged cells by more
than [+]{.underline}0.03 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 [+]{.underline}0.03 volt from the average.
[These requirements are for test purposes only and do not apply to
operating conditions.]{.underline}

**19.2.3** 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).

**19.2.4** The specific gravity readings of lead antimony cells at full
charge shall be 1.210 [+]{.underline} .010 at 77°F (25°C) at maximum
electrolyte height.

**19.2.5** When counter cells are supplied by the bidder, they shall be
the dry counter electromotive force (CEMF) type.

**19.2.6** 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.

**19.2.7** Each battery cell shall be equipped with an explosion control
device.

**19.2.8** 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.

**19.3 [Charging Equipment]{.underline}**

**19.3.1** 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.

**19.3.2** 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.

**19.3.3** 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.

**19.3.4** 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.

**19.3.5** 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, 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.

**19.3.6** 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.

**19.3.7** The charging equipment shall have a capacity to meet the
requirements of central office size and special requirements of the
owner in Part III of this bulletin.

**19.3.8** Minimum equipment requirement for chargers is one of the
following:

**19.3.8.1** Two chargers either capable of carrying the full office
load as specified in Item 12 of Part III of this bulletin; or

**19.3.8.2** Three chargers each capable of carrying half the office
load as specified in Item 12 of Part III of this bulletin.

**19.4 [Miscellaneous Voltage Supplies]{.underline}**

**19.4.1** 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 19.3.3 of
this bulletin, 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.

**19.4.2** 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.

**19.4.2.1** 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.

**19.4.2.2** 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.

**19.4.2.3** 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.

**19.4.2.4** 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.

**19.5 [Ringing Generators]{.underline}:** 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 bulletin.

**19.5.1** [Ringing Equipment Provisioning]{.underline}

**19.5.1.1** 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.

**19.5.1.2** 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.

**19.5.1.2.1** 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.

**19.5.1.2.2** 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.

**19.5.2** [Output Voltage]{.underline}

**19.5.2.1** 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 Part III of this bulletin.

**19.5.2.2** The ringing generator shall obtain its energy from the
nominal 48‑volt office battery.

**19.5.2.3** 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.

+--------------------------------+-----------+-----------+-----------+
|                                | Output    |           |           |
|                                | Volts rms |           |           |
|                                |           |           |           |
|                                | (         |           |           |
|                                | Tolerance |           |           |
|                                | 3 Volts)  |           |           |
+--------------------------------+-----------+-----------+-----------+
| Frequency Range (Hz)           | L         | M         | H         |
+--------------------------------+-----------+-----------+-----------+
| 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       |
+--------------------------------+-----------+-----------+-----------+

**19.5.2.4** No voltages in excess of the values in column H of the
table in paragraph 19.5.2.3 of this bulletin shall be provided at the
output taps. Additional intermediate and/or lower taps may be provided
without restriction.

**19.5.3** [Voltage Regulation]{.underline}

**19.5.3.1** 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
[+]{.underline}3 percent from the output voltage measured at 1/2 rated
output, 1.0 power factor with 52.1 volts dc input applied.

**19.5.3.2** 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 [+]{.underline} 10 percent from the output
voltage measured at 1/2 rated output and 1.0 power factor with 52.1
volts dc input applied.

**19.5.3.3** 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.

**19.5.4** [Cross Ringing]{.underline}: Unwanted voltage caused by
harmonic distortion or intermodulation distortion shall not exceed 15
volts rms when measured within [+]{.underline}5 Hz of any other assigned
ringing frequency under any condition of load or input battery specified
by paragraph 19.5.3 of this bulletin.

**19.5.5** [Frequency Stability]{.underline}: At ambient temperature of
70° [+]{.underline}5°F (21° [+]{.underline}0.3°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 [+]{.underline}1/3
Hz or [+]{.underline}1 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 [+]{.underline}1/3
Hz or [+]{.underline}1 percent, whichever is less stringent.

**19.5.6** [Self‑protection on Overloads]{.underline}: 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.

**19.6 [Interrupter Equipment]{.underline}**

**19.6.1** The interrupter shall be an integral part of the switching
system and shall be controlled by any call processor or equivalent.

**19.6.2** The ringing cycle provided by the interrupter equipment shall
not exceed 6 seconds in length. The ringing period shall be 2 seconds.

**19.7 [Power Panels]{.underline}**

**19.7.1** 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.

**19.7.2** 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.

**19.7.3** 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.

**19.7.4** The power panel shall be of the \"dead front\" type.

**20. Main distributing frames**

**20.1** 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.

**20.2** 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 central office
are #24 gauge or finer, the arresters and mountings need only coordinate
with #24 gauge cable conductors. Item 13 of Part III of this bulletin
designates the gauge of the cable conductors serving the host office.
Item 7 of Part IV of this bulletin designates the gauge of the cable
conductors serving the RST(s).

**20.3** 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.

**20.4** Protectors shall have a \"dead front\" (either insulated or
grounded) whereby live metal parts are not readily accessible.

**20.5** 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.

**20.6** If specified in Part III of this bulletin, 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 #22
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.

**20.7** 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.

**20.8** 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 Part III of this bulletin.

**20.9** The main distributing frame shall be equipped with a copper
ground bus bar having the conductivity of a #6 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.

**20.10** Other features not specified in paragraph 20 of this bulletin
may be required at the option of the owner, if checked in Item 13.4 of
Part III of this bulletin.

**20.11** 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.

**21. Electrical protection**

**21.1 [Surge Protection]{.underline}**

**21.1.1** 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.

**21.1.2** 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 them.

**21.1.3** [Two Categories of Surge Tests]{.underline}

**21.1.3.1** 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 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.

**21.1.3.2** 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
bulletin).

**21.1.3.3** 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 x 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.

**21.1.3.4** 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 x 1000 microseconds.

**21.1.3.5** 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.

**21.1.4** 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.

**21.1.4.1** Current Impulse Test.

**21.1.4.2** Sixty Hertz (60 Hz) Current Carrying Test.

**21.1.4.3** AC Power Service Impulse Voltage Test.

**21.1.4.4** Voltage Impulse Test.

**21.1.4.5** Arrester Response Delay Test.

**21.1.5** Tests should be applied between each of the following
terminal combinations for all line operating conditions.

**21.1.5.1** Line tip to ring.

**21.1.5.2** Line ring to ground.

**21.1.5.3** Line tip to ground.

**21.1.5.4** Line tip to ring tied together to ground.

**21.2 [Extraordinary Surge Protection]{.underline}:** 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.

**21.3 [Dielectric Strength]{.underline}:** 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.

**21.4 [Insulation Resistance]{.underline}:** 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.

**21.5 [Self-protection]{.underline}**

**21.5.1** All components shall be of the self‑protecting type, capable
of being continuously energized at rated voltage without injurious
results.

**21.5.2** 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.

**21.6 [Static Discharge]{.underline}:** Assemblies subject to damage by
static discharge shall be identified and special handling instructions
shall be supplied.

**22. Miscellaneous**

**22.1 [Office Wire]{.underline}:** 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
21.3 and 21.4 of this bulletin at a temperature of 120°F (49°C) and a
relative humidity of 90 percent.

**22.2 [Wire Wrapped Terminals]{.underline}:** 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.

**22.2.1** 6 Turns of 30 Gauge.

**22.2.2** 6 Turns of 26 Gauge.

**22.2.3** 6 Turns of 24 Gauge.

**22.2.4** 5 Turns of 22 Gauge.

**22.3 [Protection Against Corrosion]{.underline}:** 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.

**22.4 [Screws and Bolts]{.underline}:** 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.

**22.5 [Temperature and Humidity Range]{.underline}:** 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 Part V of this bulletin).

**22.6 [Stenciling]{.underline}:** 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.

**22.7 [Equipment Frame Design]{.underline}:** 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.

**22.8 [Quantity of Equipment Bays]{.underline}:** 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.

**23. Remote switching terminal (RST)**

**23.1 [General]{.underline}:** 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.

**23.2 [Span Line]{.underline}:** 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.

**23.3 [Switching]{.underline}**

**23.3.1** 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.

**23.3.2** 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.

**23.3.3** 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 Part IV of this
bulletin.

**23.4 [Subscriber Line Test]{.underline}**

**23.4.1** 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.

**23.4.2** If tests in paragraph 23.4.1 of this bulletin are not
requested by the owner for a particular installation, a subscriber loop
test set (see paragraph 15.2.3.1 of this bulletin) shall be supplied at
the RST with a means to access all lines.

**23.5 [Housing]{.underline}:** 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
bulletin.

**23.6 [Power]{.underline}**

**23.6.1** [Chargers]{.underline}: A single charger meeting the
requirements of paragraph 19.3 of this bulletin (with the exception of
paragraph 19.3.8 of this bulletin) 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 Part IV of this bulletin.

**23.6.2** [Ringing Equipment Provisioning]{.underline}

**23.6.2.1** Ringing sources shall be supplied in duplicate.

**23.6.2.2** 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.

**23.6.2.2.1** 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.

**23.6.2.2.2** 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.

**23.6.3** [Power Converter]{.underline}

**23.6.3.1** 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.

**23.6.3.2** 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.

**23.6.3.2.1** 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.

**23.6.3.2.2** 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.

**23.6.3.2.3** 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.

**23.6.3.2.4** 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.

**23.7 [Alarm]{.underline}:** Sufficient system alarm points shall be
provided from the RST to report conditions to the host alarm system.

**24. Responsibilities of the bidder**

**24.1 [Central Office Layout]{.underline}**

**24.1.1** 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.

**24.1.2** The layout drawings shall also show provision for the
ultimate capacity of the central office as specified by the owner.

**24.1.3** 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.

**24.2 [Shipment of Main Distributing Frame (MDF)]{.underline}:** 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.

**24.3 [Drawings and Printed Material]{.underline}**

**24.3.1** 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 bulletin 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:

**24.3.1.1** A floor plan showing exact dimensions and location of each
equipment frame or item to a convenient scale;

**24.3.1.2** 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.);

**24.3.1.3** Drawings of major equipment items such as frames, with the
location of major component items of equipment shown;

**24.3.1.4** Individual functional drawings for electrical circuits in
the system;

**24.3.1.5** A detailed description of the operation of each circuit
down to a circuit package level;

**24.3.1.6** Wiring diagrams indicating the specific method of wiring
used on each item of equipment and interconnection wiring between items
of equipment;

**24.3.1.7** Sufficient software documentation to maintain and service
the system, including drawings showing principal aspects of the software
architecture;

**24.3.1.8** 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

**24.3.1.9** Job drawings including all drawings that are individual to
the particular office involved, such as main frame, power panel, test
board, etc.

**24.3.2** The following information shall also be furnished:

**24.3.2.1** Complete index of the required drawings;

**24.3.2.2** Explanation of electrical principles of operation of the
overall switching system;

**24.3.2.3** List of tests which can be performed with each piece of
test equipment furnished, and explanation of the method of performing
each test;

**24.3.2.4** Sample of each form recommended for use in keeping records
of tests;

**24.3.2.5** Criteria for analyzing results of tests and determining
appropriate corrective action;

**24.3.2.6** General notes on the methods of isolating equipment faults
to specific printed circuit cards in the equipment;

**24.3.2.7** List of typical troubles which might be encountered,
together with general indications as to the probable location of each
trouble;

**24.3.2.8** Special office grounding requirements;

**24.3.2.9** A site specific central office ground system acceptance
checklist that is consistent with industry practice; and

**24.3.2.10** A site specific layout of the master ground bar (MGB)
showing assignment of P, A, N, and I equipment areas.

**24.4 [Distributing Frame Wire]{.underline}:** 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.

**24.5 [Technical Assistance Service]{.underline}:** 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.

**24.6 [Spare Parts]{.underline}**

**24.6.1** The spare parts bid price shall be based upon the required
quantities of spares shown in Item 6.2 of Part V of this bulletin, 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 bulletin. If the supplier neglects to list certain spare parts
in Item 6.2 of Part V of this bulletin, but they are necessary to comply
with this bulletin, they shall be provided by the supplier at no
additional cost to the owner.

**24.6.1.1** \"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.

**24.6.1.2** Examples of units for which spare parts should be furnished
are printed circuit cards; circuit pack assemblies; fuses; and power
supplies.

**24.6.1.3** 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.

**24.6.1.4** 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.

**24.6.1.5** When alternates are required, the price of the spare parts
for the alternates shall be included with the price of the alternate.

**24.6.1.6** 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.

**24.6.1.7** The quantities of spare parts determined in paragraph
24.6.6 of this bulletin 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.

**24.6.2** 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.

**24.6.3** 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.

**24.6.4** 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.

**24.6.5** 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.

**24.6.6** The spare parts for all of the hosts and the RST\'s included
in this contract shall be provided as follows:

+--------------------------------+--------+--------+--------+--------+
| Quantity of Units used in      | Re     |        |        |        |
|                                | quired |        |        |        |
| the CO\'s & RST\'s To Be Bid   | Qu     |        |        |        |
|                                | antity |        |        |        |
|                                | of     |        |        |        |
|                                | Spares |        |        |        |
|                                |        |        |        |        |
|                                | By     |        |        |        |
|                                | Class  |        |        |        |
|                                | of     |        |        |        |
|                                | Unit   |        |        |        |
+--------------------------------+--------+--------+--------+--------+
| > Class \-\--\>                | > 1    | > 2    | > 3    | > 4    |
+--------------------------------+--------+--------+--------+--------+
| > 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    |
+--------------------------------+--------+--------+--------+--------+

**24.6.7** 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
Part V of this bulletin for only one of the host specifications included
in the entire contract.

**24.7 [Environmental Requirements]{.underline}:** 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.

**24.8 [Unit Costs for Cost Separation Purposes]{.underline}:** 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.

**24.9 [Single‑point Grounding System Acceptance]{.underline}:**
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 1.5 of Part II of this bulletin, and
Part VI of this bulletin).

## Figure 1

**Measuring the Effects of Low Frequency Induction**

![](media/image1.wmf)

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 ± 0.001 microfarad, 150 Vdc

Figure 2

**Charger Noise Test**

![](media/image2.wmf){width="5.895833333333333in"
height="4.4006944444444445in"}

The manufacturer may elect to eliminate the capacitor C from the
measurement.

A. Capacitance in µF = 30,000 µF per ampere-hour per

cell. For example, 25 cells at 100 ampere-hour would

be equivalent to a capacitance of:

(30,000 x 100)/25 = 120,000 µF

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.

Figure 3

Summary of Electrical Requirements and Tests

+---+-----+------------+--------+--------+-------------+--------+---+
| > | T   | A          | Peak   | Surge  | No. of      | Co     | > |
|   | est | pplication | V      |        | A           | mments |   |
| P |     | Criteria   | oltage | Wav    | pplications |        | B |
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|   |     |            |        |        |             |        | g |
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|   |     |            |        |        |             |        | I |
|   |     |            |        |        |             |        | - |
|   |     |            |        |        |             |        | 6 |
|   |     |            |        |        |             |        | 5 |
+---+-----+------------+--------+--------+-------------+--------+---+
|   | C   | Low        | 500A   | 1      | 5 each      |        |   |
|   | urr | Impedance  | or     | 0x1000 | Polarity    |        |   |
|   | ent | Paths      | Lesser | μs     |             |        |   |
|   |     |            |        |        | at 1 minute |        |   |
|   | Su  | Exposed to | > C    |        |             |        |   |
|   | rge | Surges     | urrent |        | intervals   |        |   |
|   |     |            | >      |        |             |        |   |
|   |     |            | > (See |        |             |        |   |
|   |     |            | > Fig. |        |             |        |   |
|   |     |            | > 5)   |        |             |        |   |
+---+-----+------------+--------+--------+-------------+--------+---+
|   | 60  | High or    | 10A    | 11     | 3 each      |        |   |
|   | Hz  | Low        | rms or | cycles | Polarity at |        |   |
|   |     | Impedance  |        |        |             |        |   |
|   | C   |            | >      | > of   | 1 minute    |        |   |
|   | urr | paths      | Lesser | > 60   | intervals   |        |   |
|   | ent | Exposed to | > C    | > Hz   |             |        |   |
|   |     |            | urrent | >      |             |        |   |
|   | Ca  | Surges     | >      | >      |             |        |   |
|   | rry |            | > (See | (0.183 |             |        |   |
|   | ing |            | > Fig. | >      |             |        |   |
|   |     |            | > 6)   |  Sec.) |             |        |   |
+---+-----+------------+--------+--------+-------------+--------+---+
|   | AC  | AC Power   | 2500V  | 1.2x50 | 5 each      | AC     |   |
|   | Po  | Service    | or +3  | μs     | Polarity    | arr    |   |
|   | wer |            | σ      |        |             | ester, |   |
|   |     | Connection |        |        | at 1 minute |        |   |
|   | S   |            | > cl   |        |             | > if   |   |
|   | erv |            | amping |        | intervals   | >      |   |
|   | ice |            | > V of |        |             |  used, |   |
|   |     |            | >      |        |             | > must |   |
|   | Su  |            | > ar   |        |             | >      |   |
|   | rge |            | rester |        |             | > be   |   |
|   |     |            | >      |        |             | > re   |   |
|   | V   |            | > em   |        |             | moved. |   |
|   | olt |            | ployed |        |             | >      |   |
|   | age |            | > at   |        |             | > Co   |   |
|   |     |            | >      |        |             | mmunic |   |
|   |     |            | > 1    |        |             | ations |   |
|   |     |            | 0kV/μs |        |             | >      |   |
|   |     |            |        |        |             | > line |   |
|   |     |            |        |        |             | > arre |   |
|   |     |            |        |        |             | sters, |   |
|   |     |            |        |        |             | >      |   |
|   |     |            |        |        |             | > if   |   |
|   |     |            |        |        |             | >      |   |
|   |     |            |        |        |             |  used, |   |
|   |     |            |        |        |             | >      |   |
|   |     |            |        |        |             | remain |   |
|   |     |            |        |        |             | >      |   |
|   |     |            |        |        |             | > In   |   |
|   |     |            |        |        |             | >      |   |
|   |     |            |        |        |             |  place |   |
+---+-----+------------+--------+--------+-------------+--------+---+
|   | V   | High       | 1000V  | 1      | Same        | > All  |   |
|   | olt | Impedance  | or     | 0x1000 |             | > p    |   |
|   | age | Paths      |        | μs     |             | rimary |   |
|   |     |            | > +3 σ |        |             | >      |   |
|   | Su  | Exposed to | > dc   |        |             | > arre |   |
|   | rge | Surges     | >      |        |             | sters, |   |
|   |     |            | > bre  |        |             | > if   |   |
|   |     |            | akdown |        |             | >      |   |
|   |     |            | > of   |        |             | >      |   |
|   |     |            | >      |        |             |  used, |   |
|   |     |            | > ar   |        |             | > must |   |
|   |     |            | rester |        |             | > be   |   |
|   |     |            | >      |        |             | >      |   |
|   |     |            | > em   |        |             | > re   |   |
|   |     |            | ployed |        |             | moved. |   |
+---+-----+------------+--------+--------+-------------+--------+---+
|   | Ar  | Paths      | +3 σ   | 1      | Same        | > Same |   |
|   | res | protected  | bre    | 00V/μs |             |        |   |
|   | ter | by         | akdown |        |             |        |   |
|   |     |            |        | > rise |             |        |   |
|   | Re  | arresters, | > of   | >      |             |        |   |
|   | spo | such as    | > ar   |  decay |             |        |   |
|   | nse |            | rester | >      |             |        |   |
|   |     | gas tubes, | >      | > to ½ |             |        |   |
|   | De  | with       | > em   | > V.   |             |        |   |
|   | lay |            | ployed | >      |             |        |   |
|   |     | breakdown  | > at   | > in   |             |        |   |
|   |     | dependent  | >      | >      |             |        |   |
|   |     |            | > 1    | tube's |             |        |   |
|   |     | on V. rate | 00V/μs | >      |             |        |   |
|   |     | of rise.   | > of   | >      |             |        |   |
|   |     |            | >      |  delay |             |        |   |
|   |     |            | > rise | > time |             |        |   |
+---+-----+------------+--------+--------+-------------+--------+---+
|   |     |            |        |        |             |        |   |
+---+-----+------------+--------+--------+-------------+--------+---+

Figure 4

**Explanation of Surge Waveshape**

![](media/image3.wmf){width="5.895833333333333in"
height="4.4006944444444445in"}

Surge Waveshape is defined as follows:

Rise Time x Time to Decay to Half Crest Value

(For example, 10 x 1000 µs)

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

**Current Surge Test**

![](media/image4.wmf){width="5.895833333333333in"
height="3.8506944444444446in"}

VL = Not to exceed 1000V

VB = Charging Voltage

Z100 = Test Specimen Impedance to be measured at 100 Hz.

RP = Parallel Resistance (Waveshape)

RS = Series Resistance (Current Limiting)

Z100 RS RP VB

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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

Figure 6

**60 Hz Current Surge Test**

![](media/image5.wmf){width="5.895833333333333in"
height="4.4006944444444445in"}

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. (Source impedance never less

than 50 Ω longitudinal.)

Z60 Hz RS

\_\_\_\_\_\_ \_\_\_

0 140

10 120

20 100

50 100

Over 50 100

Figure 7

**Explanation of Arrester Response Delay Time**

![](media/image6.wmf){width="5.895833333333333in"
height="4.4006944444444445in"}

The delay time is that period of time when the potential across an
arrester exceeds its dc firing level.

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**PART II**

**INSTALLATION**

**1. Installation:** The following responsibilities apply to the central
office equipment installation and Remote Switching Terminal (RST)
installations, unless otherwise noted.

**1.1 [Responsibilities of Owner]{.underline}:** The owner shall:

**1.1.1** Allow the bidder and its employees free access to the premises
and facilities at all hours during the progress of the installation;

**1.1.2** 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);

**1.1.3** 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);

**1.1.4** 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);

**1.1.5** 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);

**1.1.6** 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;

**1.1.7** 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;

**1.1.8** 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;

**1.1.9** Connect outside cable pairs on the distributing frame and run
all line and trunk jumpers (those connected to protectors);

**1.1.10** 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;

**1.1.11** 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;

**1.1.12** 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;

**1.1.13** 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

**1.1.14** Provide necessary access ports for cable, if underfloor cable
is selected.

**1.2 [Responsibilities of Bidder]{.underline}:** The bidder shall:

**1.2.1** Allow the owner and its representatives access to all parts of
the buildings at all times during the installation;

**1.2.2** 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);

**1.2.3** 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;

**1.2.4** Consult with the owner before cutting into or through any part
of the building structure where the fireproofing or moisture proofing
may be impaired;

**1.2.5** 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;

**1.2.6** Not use gasoline, benzene, alcohol, naphtha, carbon
tetrachloride or turpentine for cleaning any part of the equipment;

**1.2.7** Install the equipment in accordance with the specifications
for the office;

**1.2.8** Run all jumpers, except line and trunk jumpers (those
connected to protectors);

**1.2.9** Establish and update all data base memories with subscriber
and trunk information as supplied by the owner until an agreed turnover
time;

**1.2.10** Give the owner notice of completion of the installation at
least 1 week prior to completion;

**1.2.11** 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;

**1.2.12** 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;

**1.2.13** Make final charger adjustments using the manufacturer\'s
recommended procedure;

**1.2.14** Notify the owner promptly of the completion of work of the
central office, or such portions as are ready for inspection;

**1.2.15** Correct promptly all defects for which the bidder is
responsible;

**1.2.16** 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 24.3.1 of this bulletin;

**1.2.17** Place the battery in service in compliance with the
recommendations of the battery manufacturer; and

**1.2.18** 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.

**1.3 [Installation Requirements]{.underline}**

**1.3.1** 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.

**1.3.2** All multiple and associated wiring shall be continuous, free
from crosses, reverses and grounds and shall be correctly wired at all
points.

**1.3.3** 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:

**1.3.3.1** Apparatus or equipment units failing to compare in quantity
and code with that specified for the installation;

**1.3.3.2** Apparatus or equipment units damaged or incomplete;

**1.3.3.3** Apparatus or equipment affected by rust, corrosion or marred
finish; or

**1.3.3.4** Other adverse conditions resulting from failure to meet
generally accepted standards of good workmanship.

**1.4 [Operational Test Requirements]{.underline}**

**1.4.1** 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.

**1.4.2** A sufficient quantity of overall tests shall be made to ensure
proper operation of all specified features.

**1.4.3** A sufficient quantity of locally originating and incoming
calls shall be made to prove the switching system can accept and process
calls to completion.

**1.5 [Grounding System Audit]{.underline}**

**1.5.1** 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.

**1.5.2** 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.

**1.5.3** The single‑point grounding system audit is to be conducted
using the checklist contained in Part VI of this bulletin.

**1.5.4** Part VI of this bulletin 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.

**1.5.5** It is the responsibility of the central office supplier to
ensure that the grounding system evaluation criteria contained in the
combination of the Part VI checklist of this bulletin and their optional
supplemental checklist adequately fulfill requirements for warranty
coverage.

**1.5.6** 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.

**1.5.7** The acceptance statement facesheet of the audit checklist in
Part VI of this bulletin 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.

\[Page left intentionally blank\]

**Part III**

**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                 |
| \_\_\_\               | \_\                   | \_\_\                 |
| _\_\_\_\_\_\_\_\_\_\_ | _\_\_\_\_\_\_\_\_\_\_ | _\_\_\_\_\_\_\_\_\_\_ |
+-----------------------+-----------------------+-----------------------+
| \_\_\_\_\_\_\_\_      | \_\_\_\_\_\_          | \_\_\_\_\_\_\_\_\_    |
| Attended              | Unattended            | Remotes               |
+-----------------------+-----------------------+-----------------------+

**1. GENERAL**

**1.1** Notwithstanding the bidder\'s equipment lists, the equipment and
materials furnished by the bidder must meet the requirements of Parts I,
III, and IV of this bulletin.

**1.2** Part I of this bulletin cover the minimum general requirements
for digital, stored program controlled central office switching
equipment.

**1.3** Part II of this bulletin covers requirements for installation,
inspection, and testing when such service is included as part of the
contract.

**1.4** Parts III and IV of this bulletin cover the technical data for
application engineering and detailed equipment requirements insofar as
they can be established by the owner. These parts are to be filled in by
the owner.

**1.5** Part V of this bulletin 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 part is to be filled in by the bidder and
must be presented with the bid.

**1.6** Part VI of this bulletin 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 \_\_\_

Separate Trunk Groups \_\_\_

Both (Explain in Item 16, Part III) \_\_\_

**2.2** This office shall be arranged to provide EAS service to the
following:

[Connecting Office]{.underline} [Code]{.underline} [Connecting
Office]{.underline} [Code]{.underline}

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_

**2.2.1** Seven digits shall be dialed for all local and EAS calls.

**2.3** Additional dialing procedures to be provided include the
following:

[Feature]{.underline} [Required]{.underline}

Station Paid Toll (Including Coin):

Home Numbering Plan Area (HNPA)

\"1\" + 7 Digits \_\_\_

\"1\" + 10 Digits \_\_\_

Other (Explain in Item 16, Part III) \_\_\_

Foreign Numbering Plan Area (FNPA)

\"1\" + 10 Digits \_\_\_

Other (Explain in Item 16, Part III) \_\_\_

10XXX Dialing to Interexchange Carriers:

[Name]{.underline} [Access Code]{.underline}

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_

[Feature]{.underline} [Required]{.underline}

Person, Special (Including Coin):

HNPA - \"0\" + 7 Digits \_\_\_

\"0\" + 10 Digits \_\_\_

FNPA - \"0\" + 10 Digits \_\_\_

Other (Explain in Item 16, Part III) \_\_\_

Directory Assistance:

HNPA Local - 411 \_\_\_

\"1\" + 411 \_\_\_

HNPA Toll \"1\" + 555-1212 \_\_\_

FNPA Toll \"1\" + NPA + 555-1212 \_\_\_

IDDD:

Operator Serviced 01 \_\_\_

Station-Station 011 \_\_\_

[Other Service Codes]{.underline} [Number to be Dialed]{.underline}

Wire Chief \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Repair Service \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Business Office \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Emergency Calls to 911 Lines \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Emergency Calls to 911 Trunks \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Time \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Weather \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

100 Test Line \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

102 Test Line \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

105 Test Line \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Other (Explain in Item 16,

Part III) \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**2.4** Assistance calls are answered: (Check appropriate items)

**2.4.1** At the operator office in
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**2.4.1.1** By means of the regular interoffice toll trunks \_\_\_

**2.4.1.2** By means of the regular interoffice EAS trunks \_\_\_

**2.4.1.3** By means of a separate special service

trunk group \_\_\_

**2.4.1.4** Locally \_\_\_

Explain:

**3. OFFICE CLOCK**

**3.1** This office is to be slave clock synchronized with another
office:

\_\_\_ Yes \_\_\_ No

(Explain details in Part III, Item 16 if \"Yes\".)

**3.2** This office is to be a master clock office to provide
synchronization timing for other offices:

\_\_\_ Yes \_\_\_ No

(Explain details in Part III, 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 style="width:100%;">
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<td rowspan="38"><blockquote>
<p>Part III, January 1996</p>
</blockquote></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="3">Office Name</td>
<td rowspan="38"><blockquote>
<p>Bulletin 1753E-001 Form 522</p>
<p>Page III-5</p>
</blockquote></td>
</tr>
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<td colspan="3">(By Location ________</td>
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<td colspan="3">5. TRANSLATOR FUNCTION CHART</td>
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</tr>
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<td><h6 id="called-point">Called Point</h6></td>
<td><h6 id="subscriber-dials">Subscriber Dials</h6></td>
<td colspan="2"><h2 id="translator-action">Translator Action</h2></td>
<td><h4 id="send"><u>Send</u></h4></td>
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<td colspan="2">Translator Action</td>
<td><h4 id="send-1"><u>Send</u></h4></td>
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<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>

<table style="width:100%;">
<colgroup>
<col style="width: 8%" />
<col style="width: 8%" />
<col style="width: 7%" />
<col style="width: 6%" />
<col style="width: 9%" />
<col style="width: 6%" />
<col style="width: 6%" />
<col style="width: 10%" />
<col style="width: 10%" />
<col style="width: 9%" />
<col style="width: 8%" />
<col style="width: 0%" />
<col style="width: 8%" />
</colgroup>
<tbody>
<tr class="odd">
<td rowspan="31"><blockquote>
<p>Part III, January 1996</p>
</blockquote></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td rowspan="17"><blockquote>
<p><strong>Bulletin 1753E-001 (Form 522)</strong></p>
<p>Page III-6</p>
</blockquote></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="4">Office Name</td>
</tr>
<tr class="odd">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="4">(By Location) ____________</td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
</tr>
<tr class="odd">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
</tr>
<tr class="odd">
<td colspan="8">6. LINE CIRCUIT REQUIREMENTS (Includes all lines
associated with RST’s)</td>
<td></td>
<td colspan="2"></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
</tr>
<tr class="odd">
<td colspan="2">6.1 Types of Lines</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
</tr>
<tr class="odd">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
</tr>
<tr class="odd">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2">No. of Lines</td>
<td></td>
<td colspan="2"></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>Both</td>
<td></td>
<td colspan="2">Total No.</td>
</tr>
<tr class="odd">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td><p>Local</p>
<h1 id="service-only">Service Only</h1></td>
<td><p>Local &amp;</p>
<h1 id="eas-service">EAS Service</h1></td>
<td><p>No. of EAS</p>
<h1 id="areas">Areas</h1></td>
<td colspan="2"><p>of Lines</p>
<h1 id="required">Required</h1></td>
</tr>
<tr class="even">
<td colspan="5">6.1.1 Individual – Flat Rate</td>
<td></td>
<td>__________</td>
<td>________</td>
<td>________</td>
<td colspan="2">_______</td>
</tr>
<tr class="odd">
<td colspan="4">6.1.2 Individual – Message Rate</td>
<td></td>
<td></td>
<td>__________</td>
<td>________</td>
<td>________</td>
<td colspan="2">_______</td>
</tr>
<tr class="even">
<td colspan="4">6.1.3 Pay Station</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2">_______</td>
<td></td>
</tr>
<tr class="odd">
<td colspan="4">6.1.4 Telephone Company Official Lines</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2">_______</td>
<td></td>
</tr>
<tr class="even">
<td colspan="4">6.1.5 Wire Chief</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2">_______</td>
<td></td>
</tr>
<tr class="odd">
<td colspan="5">6.1.6 911 Emergency Service Bureau Lines</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2">_______</td>
<td></td>
</tr>
<tr class="even">
<td colspan="4">6.1.7 Number Hunting PBX Groups:</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="even">
<td>Number</td>
<td></td>
<td>Direct</td>
<td>Restricted</td>
<td colspan="2">Type</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
</tr>
<tr class="odd">
<td><p>Of Lines</p>
<h1 id="in-group">In Group</h1></td>
<td><p>No. of</p>
<h1 id="groups">Groups</h1></td>
<td><p>In</p>
<h1 id="dial">Dial*</h1></td>
<td><p>Service</p>
<p><u>at COE</u></p></td>
<td><p>Ground</p>
<h1 id="start">Start</h1></td>
<td><p>Loop</p>
<h1 id="start-1">Start</h1></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="even">
<td>_______</td>
<td>______</td>
<td>_____</td>
<td>_______</td>
<td>_____</td>
<td>_____</td>
<td>__________</td>
<td>________</td>
<td>________</td>
<td colspan="2">_______</td>
<td></td>
</tr>
<tr class="odd">
<td>_______</td>
<td>______</td>
<td>_____</td>
<td>_______</td>
<td>_____</td>
<td>_____</td>
<td>__________</td>
<td>________</td>
<td>________</td>
<td colspan="2">_______</td>
<td></td>
</tr>
<tr class="even">
<td>_______</td>
<td>______</td>
<td>_____</td>
<td>_______</td>
<td>_____</td>
<td>_____</td>
<td>__________</td>
<td>________</td>
<td>________</td>
<td colspan="2">_______</td>
<td></td>
</tr>
<tr class="odd">
<td>_______</td>
<td>______</td>
<td>_____</td>
<td>_______</td>
<td>_____</td>
<td>_____</td>
<td>__________</td>
<td>________</td>
<td>________</td>
<td colspan="2">_______</td>
<td></td>
</tr>
<tr class="even">
<td>_______</td>
<td>______</td>
<td>_____</td>
<td>_______</td>
<td>_____</td>
<td>_____</td>
<td>__________</td>
<td>________</td>
<td>________</td>
<td colspan="2">_______</td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
</tbody>
</table>

\*Furnish translation information under item 5.

**6.1.8** WATS Lines (Give details in Part III, Item 16)

Number of Inward WATS Lines \_\_\_\_\_\_\_\_\_\_\_\_

Number of Outward WATS Lines \_\_\_\_\_\_\_\_\_\_\_\_

**6.1.9** Special Lines Required \_\_\_\_\_\_\_\_\_\_\_\_ (Explain in

Part III, Item 16)

**6.1.10** Total Number of Lines Required

Host \_\_\_\_\_\_\_\_\_\_ (Incl. DDI Concentrator Lines)

RST 1 \_\_\_\_\_\_\_\_\_\_

RST 2 \_\_\_\_\_\_\_\_\_\_

RST 3 \_\_\_\_\_\_\_\_\_\_

TOTAL \_\_\_\_\_\_\_\_\_\_

**6.1.11** Total Directory Numbers Required \_\_\_\_\_\_\_\_\_\_\_\_

(Including RST\'s)(see Item 7.1, Part III)

**6.1.12** Pay Station

Type \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

New \_\_\_\_ Reused \_\_\_\_

(Describe in Item 16, Part III)

**6.1.13** Line Concentrator

**6.1.13.1** Supplied by Owner (see Item 16, Part III, for details)

\_\_\_\_ Yes \_\_\_\_ No

**6.1.13.2** Supplied by Bidder (If \"Yes\", attach RUS Form 397g,
Performance Specification for Line Concentrators)

\_\_\_\_ Yes \_\_\_\_ No

**6.2 [Data on Lines Requiring Range Extension]{.underline}**

**6.2.1** Number of non-pay station lines having a loop resistance,
including the telephone set, as follows:

[No. of Lines]{.underline}

1901 - 3200 ohms \_\_\_\_\_\_\_\_\_\_\_\_

3201 - 3600 ohms \_\_\_\_\_\_\_\_\_\_\_\_

**6.2.2** Number of pay station lines having loop resistance, excluding
the telephone set, greater than:

[No. of Lines]{.underline}

1200 ohms (For Prepay) \_\_\_\_\_\_\_\_\_\_\_\_

1000 ohms (For Semi-Postpay \_\_\_\_\_\_\_\_\_\_\_\_

Operation)

**6.2.3** Range extension equipment is to be provided:

**6.2.3.1** Loop Extenders: Total Quantity \_\_\_\_\_\_\_\_\_\_\_\_

By Bidder - Quantity \_\_\_\_\_\_\_\_\_\_\_\_

By Owner - Quantity \_\_\_\_\_\_\_\_\_\_\_\_

(Explain in Item 16, Part III)

**6.2.3.2** VF Repeaters: Total Quantity \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

By Bidder - Quantity \_\_\_\_\_\_\_\_\_\_\_\_

(Bidder must have information on loading and cable size.)

By Owner - Quantity \_\_\_\_\_\_\_\_\_\_\_\_

(Explain in Item 16, Part III)

**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, Part V).

\_\_\_\_Yes \_\_\_\_No

**7. TRAFFIC DATA - LINE ORIGINATING AND TERMINATING TRAFFIC**

**7.1** Originating Line Traffic - Estimated per Busy Hour (Includes all
lines associated with RST\'s):

\(a\) (b) (axb)

CCS per No. of No. of

Main Main Total Lines

[Station]{.underline} [Stations]{.underline} [CCS]{.underline}
[Required]{.underline}^(1)^

Ind. - Res. \_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_ \_\_\_
\_\_\_\_\_\_\_\_\_\_\_

## Ind. - Bus. \_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_ \_\_\_ \_\_\_\_\_\_\_\_\_\_\_

## Special Lines \_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_ \_\_\_ \_\_\_\_\_\_\_\_\_\_\_

## Pay Station \_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_ \_\_\_ \_\_\_\_\_\_\_\_\_\_\_

## Telco Official \_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_ \_\_\_ \_\_\_\_\_\_\_\_\_\_\_

## Wire Chief \_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_ \_\_\_ \_\_\_\_\_\_\_\_\_\_\_

No. Htg. or PBX \_\_\_\_\_\_\_ ^(2)^ \_\_\_\_\_\_\_^(3)^ \_\_\_
\_\_\_\_\_\_\_\_\_\_\_

WATS \_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_ \_\_\_ \_\_\_\_\_\_\_\_\_\_\_

Data Service \_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_ \_\_\_
\_\_\_\_\_\_\_\_\_\_\_

911 Emerg. Service \_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_ \_\_\_
\_\_\_\_\_\_\_\_\_\_\_

TOTAL \_\_\_\_\_\_\_\_ \_\_\_ \_\_\_\_\_\_\_\_\_^(4)^

\(c\) (d) (e)

**7.2** Average Originating CCS per Line per Busy Hour

(d)/(e) =\_\_\_\_\_\_/\_\_\_\_\_\_=\_\_\_\_\_\_\_ CCS/Line

This office shall be engineered to handle an initial average originating
busy hour traffic of\_\_\_\_\_\_CCS per line. It is anticipated that the
average originating busy hour traffic will increase to\_\_\_\_\_\_CCS
per line.

Originating Traffic Attributed to Host
Only\_\_\_\_\_\_CCS/Line\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

^(1)^ See Part III, Item 6.1.

^(2)^ This figure is the CCS per PBX trunk.

^(3)^ This figure is the number of PBX trunks.

^(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 Part III, Item 3.1.1.2.

**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, Part III.

Terminating Traffic Attributed to Host Only\_\_\_\_\_\_CCS/Line

**7.4** Percent of Pushbutton Lines \_\_\_\_\_\_\_

**7.5** Anticipated Ultimate Capacity (20 years)

**7.5.1** Subscriber Lines

Host \_\_\_\_\_\_\_\_\_\_ (Incl. DDI Concentrator Lines)

RST 1 \_\_\_\_\_\_\_\_\_\_

RST 2 \_\_\_\_\_\_\_\_\_\_

RST 3 \_\_\_\_\_\_\_\_\_\_

TOTAL \_\_\_\_\_\_\_\_\_\_

**8. TRUNK CIRCUIT REQUIREMENTS**

**8.1 [Interoffice Trunking]{.underline}**

**8.1.1** Trunking Requirements

+----------------------------------------+------+------+------+------+
| > 1\. Connecting Office                |      |      |      |      |
+----------------------------------------+------+------+------+------+
| > 2\. Use of Trunk                     |      |      |      |      |
+----------------------------------------+------+------+------+------+
| > 3\. Trk. Grp. Ntwk. Connection^(1)^  |      |      |      |      |
+----------------------------------------+------+------+------+------+
| > 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 Coils^(2)^                 |      |      |      |      |
+----------------------------------------+------+------+------+------+
| 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                  |      |      |      |      |
+----------------------------------------+------+------+------+------+
|                                        |      |      |      |      |
+----------------------------------------+------+------+------+------+

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

^(1)^ Designation of trunk group network connection involves

the following categories:

IC - Direct Inter-LATA Connecting Trunk = (IC/POP)

TC - Tandem Connecting Trunks

IT - Intertandem Connecting Trunks

IL - Intra-LATA Connecting Trunks

TIC - Tandem Inter-LATA Connecting Trunks

Misc. - Intercept, Busy Verification, etc.

^(2)^ Omit repeating coils for carrier derived trunks.

**8.1.2** For 4-Wire Carrier, the 7dB and 16dB Pads

Total Quantity \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

By Bidder Quantity \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

By Owner Quantity \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Refer to the attached information regarding connecting company trunk
circuit drawing numbers and name of manufacturer.

**8.2 [Switched Traffic Data]{.underline}**

**8.2.1** Originating Traffic

+--------------------+-----+------+-----+--------+--------+--------+
| Type               | CCS | H.T. | BHC | No. of | Sender | R      |
|                    |     | S    |     |        | Sig.   | emarks |
|                    |     | ecs. |     | Digits |        |        |
|                    |     |      |     |        | Mode   |        |
|                    |     |      |     | Out-   |        |        |
|                    |     |      |     |        |        |        |
|                    |     |      |     | pulsed |        |        |
+--------------------+-----+------+-----+--------+--------+--------+
| 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        |     |      |     |        |        |        |
+--------------------+-----+------+-----+--------+--------+--------+
| EAS                |     |      |     |        |        |        |
+--------------------+-----+------+-----+--------+--------+--------+
| EAS                |     |      |     |        |        |        |
+--------------------+-----+------+-----+--------+--------+--------+
| EAS                |     |      |     |        |        |        |
+--------------------+-----+------+-----+--------+--------+--------+
| Tandem             |     |      |     |        |        |        |
+--------------------+-----+------+-----+--------+--------+--------+
| Tandem             |     |      |     |        |        |        |
+--------------------+-----+------+-----+--------+--------+--------+
| Tandem             |     |      |     |        |        |        |
+--------------------+-----+------+-----+--------+--------+--------+
| 911 Emerg. Service |     |      |     |        |        |        |
+--------------------+-----+------+-----+--------+--------+--------+
|                    |     |      |     |        |        |        |
+--------------------+-----+------+-----+--------+--------+--------+
|                    |     |      |     |        |        |        |
+--------------------+-----+------+-----+--------+--------+--------+
| TOTAL              |     |      |     |        |        |        |
+--------------------+-----+------+-----+--------+--------+--------+

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

^(1)^ PPCS traffic assumed to be divided 20 percent \"0\"-

and 80 percent \"0\"+ if unknown.

^(2)^ Toll calls assumed to be divided two-thirds 7 digits

and one-third 10 digits.

Busy Hour Attempts = BHC Total x 1.4 = \_\_\_\_\_\_\_\_\_

**8.2.2** Terminating Traffic

+-------------+-------+---------+-------+---------+---------+--------+
| Type        | CCS   | H.T.    | BHC   | No. of  | R       | R      |
|             |       | Secs.   |       | Digits  | eceiver | emarks |
|             |       |         |       | I       | Sig.    |        |
|             |       |         |       | npulsed |         |        |
|             |       |         |       |         | Mode    |        |
+-------------+-------+---------+-------+---------+---------+--------+
| Toll Compl. |       |         |       |         |         |        |
+-------------+-------+---------+-------+---------+---------+--------+
| Test & Ver. |       |         |       |         |         |        |
+-------------+-------+---------+-------+---------+---------+--------+
| Intraoffice |       |         |       |         |         |        |
+-------------+-------+---------+-------+---------+---------+--------+
| EAS         |       |         |       |         |         |        |
+-------------+-------+---------+-------+---------+---------+--------+
| EAS         |       |         |       |         |         |        |
+-------------+-------+---------+-------+---------+---------+--------+
| EAS         |       |         |       |         |         |        |
+-------------+-------+---------+-------+---------+---------+--------+
| Tandem      |       |         |       |         |         |        |
+-------------+-------+---------+-------+---------+---------+--------+
| Tandem      |       |         |       |         |         |        |
+-------------+-------+---------+-------+---------+---------+--------+
| Tandem      |       |         |       |         |         |        |
+-------------+-------+---------+-------+---------+---------+--------+
|             |       |         |       |         |         |        |
+-------------+-------+---------+-------+---------+---------+--------+
|             |       |         |       |         |         |        |
+-------------+-------+---------+-------+---------+---------+--------+
|             |       |         |       |         |         |        |
+-------------+-------+---------+-------+---------+---------+--------+
| TOTAL       |       |         |       |         |         |        |
+-------------+-------+---------+-------+---------+---------+--------+

**9. CHECKLIST OF FEATURES REQUIRED**

**9.1 [Alternate Routing]{.underline}** \_\_\_

(Explain in Item 16, Part III)

**9.2 [Data Service]{.underline}** \_\_\_

(Explain in Item 16, Part III)

**9.3** This office shall be:

**9.3.1** End Office Only \_\_\_

**9.3.2** End Office and Intermediate Tandem \_\_\_

(Explain in Item 16, Part III)

**9.3.3** End Office and Access Tandem \_\_\_

(Explain in Item 16, Part III)

**9.4 [Billing Data]{.underline}**

+-----------------------+-------+----+----+----+----------+----------+
|                       | Trunk | Se |    |    | Store    |          |
|                       |       | nd |    |    | Billing  |          |
|                       |       | A  |    |    | Data     |          |
|                       |       | NI |    |    |          |          |
|                       |       |    |    |    |          |          |
|                       |       | F  |    |    |          |          |
|                       |       | ea |    |    |          |          |
|                       |       | tu |    |    |          |          |
|                       |       | re |    |    |          |          |
|                       |       | G  |    |    |          |          |
|                       |       | ro |    |    |          |          |
|                       |       | up |    |    |          |          |
+-----------------------+-------+----+----+----+----------+----------+
|                       | Group | B  | C  | D  | AMA      | Pollable |
|                       |       |    |    |    | System   | System   |
+-----------------------+-------+----+----+----+----------+----------+
| **9.4.1** This office |       |    |    |    |          |          |
|                       |       |    |    |    |          |          |
| only                  |       |    |    |    |          |          |
+-----------------------+-------+----+----+----+----------+----------+
| **9.4.2** Trunks from |       |    |    |    |          |          |
| Tributaries           |       |    |    |    |          |          |
+-----------------------+-------+----+----+----+----------+----------+
| **9.4.3** Local       |       |    |    |    |          |          |
| Message Detail        |       |    |    |    |          |          |
| Recording:            |       |    |    |    |          |          |
+-----------------------+-------+----+----+----+----------+----------+

**9.5 [Pollable Systems]{.underline}**

**9.5.1** Polling device to be provided on this contract

\_\_\_ Required \_\_\_ Not Required

(Provide details in Item 16, Part III)

**9.5.2** Pollable system to be backed up by tape or disc standby

\_\_\_ Required \_\_\_ Not Required

**9.6 [AMA Format]{.underline}**

**9.6.1** Bellcore Format

\_\_\_ Required \_\_\_ Not Required

(Provide details in Item 16, Part III)

**10. MISCELLANEOUS OPERATING FEATURES**

**10.1 [Busy Verification]{.underline}**

**10.1.1** By dedicated trunk from toll operator:

**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) \_\_\_\_\_\_\_\_\_\_

**10.1.3** Access by Switchman

**10.1.3.1** Dedicated Trunk \_\_\_

**10.1.3.2** Multiple of Operator Trunk \_\_\_

**10.2 [Intercept Facilities]{.underline}**

**10.2.1** Vacant code, disconnected number, and unassigned number
intercept shall be: (Check One)

By recorded announcement:

Without cut-through to operator \_\_\_

With cut-through to operator \_\_\_

By operator \_\_\_

**10.2.2** Changed number intercept shall be: (Check One)

By recorded announcement:

Without cut-through to operator \_\_\_

With cut-through to operator \_\_\_

By operator \_\_\_

By automatic intercept system (AIS) in distant office \_\_\_

**10.2.3** Method of Reaching Operator, if required:

Separate trunk group \_\_\_

Regular interoffice toll trunks with idle

trunk selecting over at least three trunks

when three or more toll trunks are equipped \_\_\_

**10.2.4** Number of separate intercept trunk circuits \_\_\_\_\_\_\_\_

**10.3 [Line Load Control]{.underline}**

**10.3.1** Line load control facilities are:

\_\_\_ Required \_\_\_ Not Required

(Explain in Item 16, Part III)

**10.4 [Service Observing Facilities]{.underline}**

**10.4.1** Service observing facilities are:

\_\_\_ Required \_\_\_ Not Required

(Explain in Item 16, Part III)

**10.5 [Hotel-Motel Arrangements]{.underline}**

**10.5.1** Hotel-motel arrangements for operation of message registers
at the subscriber\'s premises are:

\_\_\_ Required \_\_\_ Not Required

(Explain in Item 16, Part III)

**10.5.1.1** How are message registers to be activated?

Line Reversal \_\_\_\_\_\_\_\_\_\_\_\_

Third Wire \_\_\_\_\_\_\_\_\_\_\_\_

Other \_\_\_\_\_\_\_\_\_\_\_\_

(Explain in Item 16, Part III)

**10.6 [Nailed-Up Connections]{.underline}**

\_\_\_ Required \_\_\_ Not Required

(Explain in Item 16, Part III)

**10.7 [Vertical Services]{.underline}:** (RST Lines are Included)

[Initially]{.underline} [Ultimate]{.underline}

**10.7.1** Call Waiting No. of Lines \_\_\_\_\_\_ \_\_\_\_\_\_\_\_

**10.7.2** Call Forwarding No. of Lines \_\_\_\_\_\_ \_\_\_\_\_\_\_\_

\_\_\_ Local \_\_\_ Remote

(Explain in Item 16, Part III)

**10.7.3** Abbreviated Dialing No. of Lines \_\_\_\_\_\_
\_\_\_\_\_\_\_\_

No. of Codes per Line \_\_\_\_\_\_ for \_\_\_\_\_\_ Lines

No. of Codes per Line \_\_\_\_\_\_ for \_\_\_\_\_\_ Lines

**10.7.4** Three-Way Calling No. of Lines \_\_\_\_\_\_ \_\_\_\_\_\_\_\_

CCS Per Line \_\_\_\_\_\_ \_\_\_\_\_\_\_\_

**10.7.5** Other \_\_\_

(Explain in Item 16, Part III)

**11. MAINTENANCE FACILITY REQUIREMENTS**

**11.1 [Alarm Signals]{.underline}**

**11.1.1** Handled locally

Explain in Detail:
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**11.1.2** Transmitted to attended point

**11.1.2.1** Via operator office trunks \_\_\_

**11.1.2.2** Via printout or other display service \_\_\_

Explain in
Detail:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**11.1.2.3** Type of tone to operator

**11.1.2.3.1** Distinctive tone \_\_\_

(see paragraph 9.2.9 of Part I)

**11.1.2.3.2** Other \_\_\_

Explain in
Detail:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**11.1.3** Alarm checking signals for carrier and mobile radio systems

**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]{.underline}**

**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, Part III)

**11.2.1.3** Dial speed test circuit \_\_\_

(Explain in Item 16, Part III)

**11.2.1.4** Pushbutton dialing test circuit \_\_\_

**11.2.1.5** Howler \_\_\_

(per paragraph 15.2.3.3 of Part I)

**11.2.1.6** Hand test sets, number required \_\_\_\_\_\_\_\_\_

(Explain in Item 16, Part III)

**11.3 [Transmission Tests]{.underline}**

**11.3.1** Furnish reference tone Yes \_\_\_ No \_\_\_

Frequencies and Order Time Interval for

[in Which Applied]{.underline} [Application of Each
Frequency]{.underline}

\_\_\_\_\_\_\_\_\_\_\_\_Hz \_\_\_\_\_\_\_\_\_\_\_Seconds

\_\_\_\_\_\_\_\_\_\_\_\_Hz \_\_\_\_\_\_\_\_\_\_\_Seconds

\_\_\_\_\_\_\_\_\_\_\_\_Hz \_\_\_\_\_\_\_\_\_\_\_Seconds

\_\_\_\_\_\_\_\_\_\_\_\_Hz \_\_\_\_\_\_\_\_\_\_\_Seconds

**11.3.2** Test Lines

**11.3.2.1** Test Line 100 \_\_\_

**11.3.2.2** Test Line 102 \_\_\_

**11.3.2.3** Test Line 104 \_\_\_

**11.3.2.4** Test Line 105 \_\_\_

(Explain in Item 16, Part III)

**11.3.2.5** Test Line 107 \_\_\_

**11.3.2.6** Remote Office Test Line \_\_\_

(Explain in Item 16, Part III)

**11.4 [Line Testing]{.underline}**

**11.4.1** Automatic line insulation testing Yes \_\_\_ No \_\_\_

**11.4.2** Owner supplied equipment Yes \_\_\_ No \_\_\_

**11.4.2.1** Vendor supplied interface only Yes \_\_\_ No \_\_\_

If supplied by owner, explain in Item 16,

Part III, including manufacturer, model,

location.

**11.5 [Remote Control]{.underline}**

**11.5.1** Remote control of the system shall be provided.

Yes \_\_\_ No \_\_\_

If required, explain in Item 16, Part III,

including number, type and location.

**12. POWER EQUIPMENT REQUIREMENTS (Host Office Only)**

**12.1 [Central Office Battery]{.underline}**

**12.1.1** A battery reserve of \_\_\_\_\_\_\_\_\_\_ busy hours shall be
provided for this office when it reaches \_\_\_\_\_\_\_\_\_\_ lines at
the ultimate anticipated traffic rates specified in Item 7.2, Part III.

**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 \_\_\_ No \_\_\_

**12.1.2** [Type of battery]{.underline}: (Check One) Lead Calcium
\_\_\_

Lead Antimony \_\_\_

**12.1.3** Voltmeter (portable 3-60-150 volt scale, 1% accuracy) shall
be furnished.

Yes \_\_\_ No \_\_\_

**12.1.4** Hydrometer in a hydrometer holder with glass or plastic drop
cup shall be furnished.

Yes \_\_\_ No \_\_\_

**12.1.5** Type of battery rack required: (Check One)

Two Tier \_\_\_ Other \_\_\_ Explain: \_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**12.1.6** Special equipment power requirements (carrier, voice
frequency repeaters, etc.). Drain in amperes \_\_\_\_\_\_\_\_\_\_\_\_.

**12.1.6.1** Supply all necessary equipment to provide the following
48-volt battery taps:

Fuse (or Circuit

[Number of Circuits]{.underline} [Breaker) Size]{.underline}

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**12.2 [Charging Equipment]{.underline}**

**12.2.1** Charging equipment shall be provided capable of charging the
office battery on a full float basis when the office reaches
\_\_\_\_\_\_\_\_\_\_\_ lines at the ultimate anticipated traffic rates
specified in Item 7.2, Part III.

**12.2.2** [Charger input rating shall be]{.underline}:

[3-Phase Connection]{.underline}:

Voltage \_\_\_\_\_\_\_\_\_\_\_\_ 3-Wire \_\_\_\_\_\_\_

Phase \_\_\_\_\_\_\_\_\_\_\_\_ 4-Wire \_\_\_\_\_\_\_

Frequency \_\_\_\_\_\_\_\_\_\_\_\_ Delta \_\_\_\_\_\_\_

Y \_\_\_\_\_\_\_

**12.3 [Ringing Equipment]{.underline}**

**12.3.1** Solid-state ringing equipment in accordance with paragraph
19.5.1 of Part I 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 \_\_\_\_\_\_\_\_\_\_\_\_ lines
at the ultimate anticipated traffic rates specified in Item 7.2, Part
III.

**12.3.2** [Ringing frequencies to be supplied]{.underline}:

Frequency Maximum No. of

[in Hz]{.underline} [Telephones]{.underline}

Single Frequency 20 \_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_

Decimonic 20 \_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_

30 \_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_

40 \_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_

50 \_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_

Harmonic 16-2/3 \_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_

25 \_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_

33-1/3 \_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_

50 \_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_

Synchromonic 20 \_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_

30 \_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_

42 \_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_

54 \_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_

**12.3.3** Furnish frequency meter (accurate within 1.3 Hz) and
voltmeter (5% accuracy) for ringing measurements (see paragraph 19.7.2
of Part I). Check One:

Panel Mounted \_\_\_ Portable \_\_\_ Not Required \_\_\_

**12.4 [Power Board]{.underline}**

The power panel and associated wiring shall be of ample size to meet the
load requirements when this office reaches \_\_\_\_\_\_\_\_\_\_\_\_
lines at the ultimate anticipated traffic rates specified in Item 7.2,
Part III.

**13. DISTRIBUTING FRAME REQUIREMENTS (HOST OFFICE ONLY)**

**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 \_\_\_\_\_\_\_\_\_

Explain:
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**13.4 [Main Frame Details]{.underline}**

Is present MDF to be reused? Yes \_\_\_ No \_\_\_

If \"Yes,\" Type \_\_\_\_\_\_\_\_\_\_\_\_

Reused protectors are:

\_\_\_\_\_\_\_\_\_\_ (Mfgr.) \_\_\_\_\_\_\_\_\_\_\_ (Type)

**13.4.1** Number of pairs of arrester units

(switching equipment)\_\_\_\_\_\_\_\_\_\_\_\_

**13.4.2** Number of pairs of gas tube arrester units

(special equipment)\_\_\_\_\_\_\_\_\_\_\_

**13.4.2.1** Gas tubes to be:

\_\_\_light, \_\_\_medium, \_\_\_heavy, \_\_\_max. duty units

**13.4.2.2** Fail shorted/low breakdown failure mode required

Yes \_\_\_ No \_\_\_

**13.4.2.3** Breakdown voltage of gas tube arresters
\_\_\_\_\_\_\_\_\_\_

**13.4.3** Number of terminated pairs to be grounded
\_\_\_\_\_\_\_\_\_\_

**13.4.4** Factory assembled tip cable Yes \_\_\_ No \_\_\_

**13.4.4.1** Tip cable length \[if other than 20 feet (610 cm)\]

\_\_\_\_\_\_\_\_\_

**13.4.4.2** Tip cable formed Up \_\_\_ Down \_\_\_

**13.4.5** Pairs per vertical \_\_\_\_\_\_\_\_\_\_\_\_

**13.4.6** Height of vertical \_\_\_\_\_\_\_\_\_\_feet
\_\_\_\_\_\_\_\_\_\_inches

**14. BUILDING AND FLOOR PLAN INFORMATION (HOST OFFICE ONLY)**

**14.1** Equipment is to be installed in an

existing building (Attach detailed plan.) \_\_\_

**14.2** A new building is planned \_\_\_

**14.2.1** Tentative plan ([Note to Engineer]{.underline}: Show sketch
without dimensions.)

**14.3 [Detailed Arrangements]{.underline}**

**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 \_\_\_ No \_\_\_

**14.3.2** Vestibule required Yes \_\_\_ No \_\_\_

**14.3.3** Cable entrance Overhead \_\_\_ Underground \_\_\_

**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 \_\_\_

Underfloor (Computer Room Type) Interbay Cabling \_\_\_

**14.3.6** Is earthquake bracing required? Yes \_\_\_ No \_\_\_

(If \"Yes,\" explain zone and criteria used for zone

in Item 16, Part III.)

**14.3.7** Office ground will be \_\_\_\_\_\_\_\_\_\_ 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 21.2 of Part I).

\_\_\_ Very High \_\_\_ Lower than Average

\_\_\_ Higher than Average \_\_\_ Very Low

\_\_\_ Average

**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.)

**Part IV**

**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, Part III).

**1.1** Single-Party: \_\_\_\_\_\_\_\_Flat Rate \_\_\_\_\_\_\_\_Message
Rate

**1.2** Semi-Postpay Pay Station \_\_\_\_\_\_\_

**1.3** Prepay Pay Station \_\_\_\_\_\_\_\_

**1.4** PABX Lines \_\_\_\_\_\_\_\_ Loop Start \_\_\_ Ground Start
\_\_\_

Restricted at Office \_\_\_ Other \_\_\_

(Describe in Item 12, Part IV)

**1.5** Number of lines to be pushbutton \_\_\_\_\_\_\_\_

**1.6** 911 Emergency Lines \_\_\_\_\_\_\_\_

**1.7** Anticipated ultimate capacity (20-Year) \_\_\_\_\_\_\_\_

**2. TRAFFIC**

**2.1** Originating traffic per line - CCS/BH: \_\_\_\_\_\_\_\_Initial

\_\_\_\_\_\_\_\_Ultimate

**2.2** Terminating traffic per line - CCS/BH: \_\_\_\_\_\_\_\_Initial

\_\_\_\_\_\_\_\_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]{.underline}

1501 - 1900 Ohms \_\_\_\_\_\_\_\_\_\_\_\_

1901 - 3200 Ohms \_\_\_\_\_\_\_\_\_\_\_\_

**3.2** Number of pay station lines having loop resistance, excluding
the telephone set, greater than:

[No. of Lines]{.underline}

1200 Ohms (For Prepay) \_\_\_\_\_\_\_\_\_\_\_\_

1000 Ohms (For Semi-Post

Pay Operation) \_\_\_\_\_\_\_\_\_\_\_\_

**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]{.underline}: Total Quantity
\_\_\_\_\_\_\_\_\_\_

By Bidder - Quantity \_\_\_\_\_\_\_\_\_\_

By Owner - Quantity \_\_\_\_\_\_\_\_\_\_

(Explain in Item 12, Part IV)

**4.3** [VF repeaters]{.underline}: Total Quantity \_\_\_\_\_\_\_\_\_\_

By Bidder - Quantity \_\_\_\_\_\_\_\_\_\_

By Owner - Quantity \_\_\_\_\_\_\_\_\_\_

(Explain in Item 12, Part IV)

**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 \_\_\_\_\_\_\_\_
lines at the ultimate anticipated traffic rates specified in Item 2,
Part IV.

**5.2** [Charger input rating shall be]{.underline}:

Voltage \_\_\_\_\_\_\_\_ [3-Phase Connection]{.underline}:

Phase \_\_\_\_\_\_\_\_

Frequency \_\_\_\_\_\_\_\_ 3-Wire \_\_\_\_\_\_\_\_\_\_\_

4-Wire \_\_\_\_\_\_\_\_\_\_\_

Delta \_\_\_\_\_\_\_\_\_\_\_

Y \_\_\_\_\_\_\_\_\_\_\_

**5.2.1** Charger shall be capable of charging the RST battery on a full
float basis when the RST reaches \_\_\_\_\_\_\_\_\_\_ lines at ultimate
traffic rate specified in Item 2, Part IV.

**5.2.2** Charger shall be redundant \_\_\_

**5.3** Battery reserve shall be \_\_\_\_\_\_\_\_\_\_ busy hours when
the RST reaches \_\_\_\_\_\_\_\_\_ lines at the ultimate anticipated
traffic specified in Item 2, Part IV.

**5.4** Standby power is available. Yes \_\_\_ No \_\_\_

**5.5** Special equipment power requirements \_\_\_\_\_\_\_\_ amps

**5.6 [Ringing]{.underline}**

**5.6.1** Type of Ringing

**5.6.2** Frequency No. [1.]{.underline} [2.]{.underline}
[3.]{.underline} [4.]{.underline}

Frequency HZ \_\_\_\_\_ \_\_\_\_\_ \_\_\_\_\_ \_\_\_\_\_

Max. No. Phones/

Frequency \_\_\_\_\_ \_\_\_\_\_ \_\_\_\_\_ \_\_\_\_\_

**5.6.3** Wattage to be sized for \_\_\_\_\_\_\_\_\_\_ lines.

**5.6.4** Frequency Meter (see Item 12.3.3, Part III)

Panel Mounted \_\_\_ Not Required \_\_\_

**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 \_\_\_ No \_\_\_

Further requirements should be listed under Item 12, Part IV.

**7. RST DISTRIBUTION FRAME REQUIREMENTS**

**7.1** Total number of outside plant cable pairs to

be terminated \_\_\_\_\_\_\_\_\_

**7.1.1** Gauge of outside plant cable pairs \_\_\_\_\_\_\_\_\_\_

**7.2** Number of outside plant cable pairs

to be protected \_\_\_\_\_\_\_\_\_\_

**7.3** Number of additional protector pair units to be

provided on MDF \_\_\_\_\_\_\_\_\_\_

Explain:
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**7.4 [Main Frame Details]{.underline}**

**7.4.1** Present MDF to be reused Yes \_\_\_ No \_\_\_

If \"Yes\", Type \_\_\_\_\_\_\_\_\_\_\_\_\_

Reused protectors are:

\_\_\_\_\_\_\_\_\_\_(Mfr.) \_\_\_\_\_\_\_\_\_\_\_(Type)

**7.4.2** Number of pairs of arrester units

(switching equipment) \_\_\_\_\_\_\_\_\_\_

**7.4.3** Number of pairs of gas tube arrester units

(special equipment) \_\_\_\_\_\_\_\_\_\_

**7.4.3.1** Gas tubes to be:

\_\_\_ light, \_\_\_ medium, \_\_\_ heavy, \_\_\_ maximum duty units.

**7.4.3.2** Fail shorted/low breakdown failure mode required

Yes \_\_\_ No \_\_\_

**7.4.3.3** Breakdown voltage of gas tube arresters \_\_\_\_\_\_\_\_

**7.4.4** Number of terminated pairs to be grounded \_\_\_\_\_\_\_\_

**7.4.5** Factory assembled tip cable Yes \_\_\_ No \_\_\_

**7.4.5.1** Tip cable length \[if other than 20 feet(610 cm)\]

\_\_\_\_\_\_\_\_

**7.4.5.2** Tip cable formed Up \_\_\_ Down \_\_\_

**7.4.6** Pairs per vertical \_\_\_\_\_\_\_\_\_

**7.4.7** Height of vertical \_\_\_\_\_\_\_\_feet \_\_\_\_\_\_\_\_inches

**8. BUILDING AND FLOOR PLAN INFORMATION**

**8.1** RST to be mounted in building \_\_\_

**8.1.1** Earthquake bracing required

Yes \_\_\_ No \_\_\_ (see Item 14.3.6, Part III)

**8.1.2** Supply building floor plan

**8.2** RST to be mounted in cabinet out of doors \_\_\_

**8.2.1** Cabinet to be mounted \_\_\_\_\_\_on pole \_\_\_\_\_\_on
ground

**9. SUBSCRIBER LINE TEST**

**9.1** Remote testing of subscriber lines is required

Yes \_\_\_ No \_\_\_

**9.2** Subscriber loop test set \_\_\_

**10. SPAN LINES TO HOST CENTRAL OFFICE**

**10.1** To be supplied by Owner \_\_\_

**10.2** To be supplied by Bidder \_\_\_

**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 \_\_\_\_\_\_\_\_ ohms 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.

\_\_\_ Very High \_\_\_ Lower than Average

\_\_\_ Higher than Average \_\_\_ Very Low

\_\_\_ Average

**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**

**Part v**

**Specifications for Digital, Stored Program Controlled Central Office
Equipment Detailed Requirements - Bidder Supplied Information**

+-----------------------+-----------+-----------+-----------------------+
| Telephone Company     |           |           |                       |
|                       |           |           |                       |
| Name                  |           |           |                       |
| \_\_\_\_\_\_\         |           |           |                       |
| _\_\_\_\_\_\_\_\_\_\_ |           |           |                       |
| \_\_\_\_\_\_\_\_\_\_\ |           |           |                       |
| _\_\_\_\_\_\_\_\_\_\_ |           |           |                       |
| \_\_\_\_\_\_\_\_\_\_\ |           |           |                       |
| _\_\_\_\_\_\_\_\_\_\_ |           |           |                       |
+-----------------------+-----------+-----------+-----------------------+
| Location              |           |           |                       |
|                       |           |           |                       |
| \_\_                  |           |           |                       |
| \_\_\_\_\_\_\_\_\_\_\ |           |           |                       |
| _\_\_\_\_\_\_\_\_\_\_ |           |           |                       |
| \_\_\_\_\_\_\_\_\_\_\ |           |           |                       |
| _\_\_\_\_\_\_\_\_\_\_ |           |           |                       |
| \_\_\_\_\_\_\_\_\_\_\ |           |           |                       |
| _\_\_\_\_\_\_\_\_\_\_ |           |           |                       |
+-----------------------+-----------+-----------+-----------------------+
| Central Office Name   |           |           |                       |
| (By Location)         |           |           |                       |
+-----------------------+-----------+-----------+-----------------------+
| Town                  | County    |           | State                 |
| \_\_\_\               | \_\_\_    |           | \_\_\                 |
| _\_\_\_\_\_\_\_\_\_\_ | \_\_\_\_\ |           | _\_\_\_\_\_\_\_\_\_\_ |
|                       | _\_\_\_\_ |           |                       |
+-----------------------+-----------+-----------+-----------------------+
| > Attended            |           | > U       |                       |
| > \_\_\_\_\_\_\_\_    |           | nattended |                       |
|                       |           | > \_\     |                       |
|                       |           | _\_\_\_\_ |                       |
+-----------------------+-----------+-----------+-----------------------+
|                       |           |           |                       |
+-----------------------+-----------+-----------+-----------------------+

**1. GENERAL**

**1.1** The equipment and materials furnished by the bidder must meet
the requirements of Parts I, III and IV of this bulletin.

**1.2** Part I of this bulletin covers the minimum general requirements
for digital, stored program controlled central office switching
equipment.

**1.3** Part II of this bulletin covers requirements for installation,
inspection, and testing when such service is included as part of the
contract.

**1.4** Part II and IV of this bulletin cover the technical data for
application engineering and detailed equipment requirements insofar as
they can be established by the owner. These parts are to be filled in by
the owner.

**1.5** Part V of this bulletin 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 part is to be filled in by the bidder and
must be presented with the bid.

**1.6** Part VI of this bulletin is the single-point grounding system
audit checklist.

**2. PERFORMANCE OBJECTIVES**

**2.1 [Reliability]{.underline}** (see paragraph 2 of Part I)

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**2.2 [Busy Hour Load Capacity and Traffic Delay]{.underline}** (see
paragraph 5.10 of Part I. Describe basis for traffic analysis.)

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**3. EQUIPMENT QUANTITIES DEPENDENT ON SYSTEM DESIGN**

**3.1 [Switch Frames and Circuits]{.underline}**

**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, Part III, 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 \_\_\_\_\_\_\_\_\_\_\_.

**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, Part III) 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 \_\_\_\_\_\_\_\_\_\_\_.

**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, Part III), 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 \_\_\_\_\_\_\_\_\_\_\_\_.

**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 \_\_\_\_\_\_\_\_.

**4.3** Number of span line terminations to the central office

being supplied \_\_\_\_\_\_\_\_\_\_\_\_.

**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 \_\_\_\_\_\_\_\_ Ultimate\_\_\_\_\_\_\_\_

Voltage: Single-Phase\_\_\_\_\_\_\_\_ Three-Phase\_\_\_\_\_\_\_\_

**4.6** Special environmental requirements for the remote end:

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**5. POWER**

**5.1 [AC Power Drain Watts]{.underline}**

Initial \_\_\_\_\_\_\_\_ Ultimate \_\_\_\_\_\_\_\_

**5.2 [Heat Dissipation Watts]{.underline}**

Provide the initial and ultimate equipment dissipation for each
equipment room.

**5.2.1** Operating Temperature Range

Minimum \_\_\_\_\_\_\_\_\_ Maximum \_\_\_\_\_\_\_\_\_

**5.2.2** Operating Humidity Range

Minimum \_\_\_\_\_\_\_\_\_ Maximum \_\_\_\_\_\_\_\_\_

**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
16.1.1 of Part I;

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
24.6.1.3 of Part I, must fall into one of the four classes. The
information must be in the following format:

<table style="width:100%;">
<colgroup>
<col style="width: 10%" />
<col style="width: 10%" />
<col style="width: 10%" />
<col style="width: 10%" />
<col style="width: 10%" />
<col style="width: 10%" />
<col style="width: 10%" />
<col style="width: 10%" />
<col style="width: 10%" />
<col style="width: 10%" />
</colgroup>
<tbody>
<tr class="odd">
<td></td>
<td></td>
<td colspan="4"><p>Quantity Of Units</p>
<p>In The CO's &amp; RST's</p>
<p>Which Are Bid</p></td>
<td colspan="4"><p>Quantity of</p>
<p>Spare Parts Furnished</p>
<p>With This Bid</p></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td colspan="4">________________________</td>
<td colspan="4">_________________________</td>
</tr>
<tr class="odd">
<td>Unit</td>
<td>Unit</td>
<td colspan="4">Class</td>
<td colspan="4">Class</td>
</tr>
<tr class="even">
<td>No.</td>
<td>Name</td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
</tr>
<tr class="odd">
<td>_____</td>
<td>_____</td>
<td>_____</td>
<td>_____</td>
<td>_____</td>
<td>_____</td>
<td>_____</td>
<td>_____</td>
<td>_____</td>
<td>_____</td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>

**7. EXPLANATORY NOTES**

\[Page left intentionally blank\]

**Part vi**

**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 Supplier
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Consulting Engineer
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Mutually Approved Exceptions:

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Grounding System Approval:

[Name]{.underline} [Signature]{.underline} [Title]{.underline}
[Date]{.underline}

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_

(Owner Representative)

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_

(Supplier Representative)

**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 21.2 of Part I)

\_\_\_ Very High \_\_\_ Lower than Average

\_\_\_ Higher than Average \_\_\_ Very low

\_\_\_ Average

**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 \_\_\_\_\_\_ ohms. (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: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ 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: \_\_\_ Yes \_\_\_ 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: \_\_\_ Yes \_\_\_ 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: \_\_\_ Yes \_\_\_ 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: \_\_\_ Yes \_\_\_ 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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**2.14** If metallic conduit is used, it is to be insulated from all
ironwork.

Acceptable: \_\_\_ Yes \_\_\_ 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: \_\_\_ Yes \_\_\_ 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: \_\_\_ Yes \_\_\_ 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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**3.2** Check for appearance and proper location of following on MGB:

\(a\) R - Interior radio equipment[^1]^1)^

\(b\) 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]^2)^

\(f\) B - Building structure ground(2)

\(g\) L - Central office ground field(2)

\(h\) W - Water pipe system(2)

\(i\) N1 - Battery Return[^3]^3)^

\(j\) N2 - Outside IGZ: \_\_\_\_\_\_\_\_\_\_(3)

\(k\) N3 - Outside IGZ: \_\_\_\_\_\_\_\_\_\_(3)

\(l\) I1 - Ground window bar[^4]^4)^

\(m\) I2 - Ground window bar (4)

Acceptable: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**3.4** MGB is to be properly insulated from the mounting surface.

Acceptable: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**3.5** All connections are to be tight.

Acceptable: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**3.6** The MGB is to have an anticorrosion coating of the type which
enhances conductivity.

Acceptable: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**3.7** Bar is to be clearly stenciled or legibly labeled \"MGB.\"

Acceptable: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**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: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**4.4** GWB is to be clearly stenciled or labeled \"GWB.\"

Acceptable: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**4.5** All connections are to be tight.

Acceptable: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**5.3** All cable racks, ground mats, switching and transmission
equipment within the IGZ are to have ground leads [only]{.underline} to
the GWB. (Refer to RUS TE&CM 810, Item 5.5.2.)

Acceptable: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**5.6** With the GWB disconnected from the MGB, the resistance reading
of \_\_\_\_\_\_\_ 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: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**6.3** All entrance cable shields are to be bonded separately to #6 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: \_\_\_ Yes \_\_\_ No

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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**7.2** The CEGB is to be located as close as possible to the physical
ends of the entrance cable shields.

Acceptable: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**7.4** All connections are to be tight.

Acceptable: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**7.5** Bar is to be clearly stenciled or legibly labeled \"CEGB.\"

Acceptable: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**7.6** All ground leads are to be properly sized and labeled.

Acceptable: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**7.7** The CEGB is to have an anticorrosion coating of the type which
enhances conductivity.

Acceptable: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**8.3** All incoming subscriber cable pairs are to be properly
terminated at either a protector equipped terminal or connected to
ground.

Acceptable: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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 #6
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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**8.9** The MDFB should be free of all other ground leads when not used
as an MGB.

Acceptable: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**10.4** All radio equipment cabinet(s) are to be at least 10 feet (305
cm) from the IGZ.

Acceptable: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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**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: \_\_\_ Yes \_\_\_ No

Comments:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

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[^1]: ^(1)^ Surge Producer - (P)

[^2]: ^(2)^ Surge Absorber -(A)

[^3]: ^(3)^ Grounds to non-IGZ Equipment - (N)

[^4]: ^(4)^ Grounds to IGZ Equipment (GWB\'s) - (I)