**DATA ITEM DESCRIPTION**

**Title:** Telecommunications System Engineering Plan

**Number:** DI-TCPS-81120 **Approval Date:** 901219

**AMSC Number:** A6007 **Limitation:** N/A

**DTIC Applicable:** No **GIDEP Applicable:** No

**Office of Primary Responsibility:**

**Applicable Forms:** N/A

**Use/relationship:**

The Telecommunications System Engineering Plan presents the
contractor\'s engineering concept of and solutions to the specification
or statement of work (SOW) requirements. It also provides the
implementation methods, formulas and calculations, and proposed major
bill of material items.

The plan enables the government to monitor, review, and evaluate the
contractor\'s engineering efforts prior to system installation.

This Data Item Description (DID) contains the format and content
preparation instructions for the data product generated by the specific
and discrete task

requirement as delineated in the contract.

This DID is applicable to contracts requiring preparation of a system
engineering plan as part of the telecommunications engineering project.

This DID supersedes DI-E-1135.

[Reference documents.]{.underline} The applicable issue of the documents
cited herein, including their approval dates and dates of any applicable
amendments, notices, and revisions, shall be as specified in the
contract.

[Content.]{.underline} Information contained in the Telecommunications
System Engineering Plan (SEP) shall be in sufficient detail to
illustrate that the system provided shall meet the performance
requirements of the specification or sow. The plan shall also contain
the following material:

[Summary schedule.]{.underline} The summary schedule shall list all the
major actions required to complete the project. Deliverable items listed
in the summary schedule

shall be identified by contract line item number or contract data
requirements list sequence number, as applicable, and delivery dates.

[System block diagram.]{.underline} The diagram shall portray how the
various individual equipments connect to form the completed system at
the rack, station and overall system levels.

The plan enables the Government to monitor, review, and evaluate the
contractor's engineering efforts prior to installation.

This DID supersedes DI-S-1135

**Requirements:**

[Link system. and special circuit performance calculations.]{.underline}

a.  [Radio systems.]{.underline} Calculations shall include path
    profiles, terrain clutter, path design parameters, antenna heights,
    median and worst hour path loss calculation, distribution of path
    loss over a period of one year, median and worst hour fade margins,
    service probability factor, median and worst hour to approval of the
    system concept and preparation of detailed site installation plans,
    top-channel noises, median and worst hour signal-to-noise ratios,
    and noise margins. Link design parameters shall include tower
    heights, antenna heights, path clearance criteria, receiver
    intermediate frequency (IF) bandwidth, noise power ratio,
    transmitter power, frequency deviation, modulation index, receiver
    noise figure, feeder lengths, feeder losses, feeder
    voltage-standing-wave ratios, feeder velocity of propagation,
    equalization requirements to support system transmission
    requirement, order and type of diversity, type of combiner,
    threshold extension improvement, pre-emphasis, antenna size, antenna
    gain, and top baseband frequency. Link calculations shall include
    Fresnel zone clearance, total noise and its sources, signal-to-noise
    ratio, noise margin; fade margin, and time availability.
    Calculations shall be presented in a step-by-step manner with
    sufficient details for the Government to verify all calculations.
    Calculations shall be presented for frequency inter-modulation and
    total system frequency assignment and Radio frequency interferences
    (RFI) possibilities. Special circuit performance and method of
    calculations will be identified in the specification or sow.

b.  [Telephone systems.]{.underline} Calculations shall include dc range
    of the

> central office, trunk loading, central office traffic loading,
> estimated or measured busy hour traffic data, trunk and switch
> blockage calculations, station battery endurance, telephone instrument
> ringer range, and receiver level.

c.  [Communications center and data systems.]{.underline} Calculations
    shall include estimated storage, output, and through-put capacities:
    reliability computations and specifications for each hardware
    component; and traffic flow.

d.  [Other systems.]{.underline} Calculations shall include circuit
    performance requirements with method of calculation as identified in
    the specification or sow.

[Availability, reliability, maintainability predictions.]{.underline}

a.  [Availability.]{.underline} An availability model shall identify all
    elements of the system included in the calculations. Discussion of
    the rationale for the decisions and assumptions reflected in the
    model shall also be included. Listing of factors to be included or
    excluded in calculations will be identified in the specification or
    sow.

b.  [Reliability.]{.underline} A reliability model shall identify all
    elements of the system included in the calculations. Discussion of
    the rationale for the decisions and assumptions reflected in the
    model shall also be included. Mean-time between failure data shall
    be included for all equipments. Analytical calculations shall be
    made using failure rates from manufacturers, users, and other
    approved sources. Failure rates from section 5 of HIL-HDBK-217 shall
    be used if rates are not available from other sources. Listing of
    factors to be included or excluded in calculations will be
    identified in the specification or sow.

c.  [Maintainability.]{.underline} The maintainability calculations
    shall reflect the maintenance, repair or restore and philosophy
    developed for the system. Meantime to repair and mean-time to
    restore requirements shall be included for all equipment.

[Mission and supervisory multiplex plan.]{.underline} This plan shall
satisfy the channelization and circuit identification listing. The plan
shall include the system configuration with routing of supergroups and
groups. The site multiplex terminals shall include channel equipment
with designated spares.

[Channelization listing.]{.underline} This listing shall include
cross-referencing of each circuit, with supergroup, group, and channel
assignment. Listing shall be from end-to-end, denoting every
interconnect patch and type required. Circuits to receive best channel
assignments shall be identified.

[Requirement identification listing.]{.underline} This listing shall
identify a unique identifier for each user circuit requirement and shall
be prepared in table format with columns identifying requirement number,
end-to-end points (terminals), and description of each user requirement.

[Site plot plans and layout plans.]{.underline} The plans shall include
drawings showing overall site plan with project areas clearly identified
and building layout with equipment areas identified. These plans shall
also include cables, conduit, pipelines, manholes, and other items that
affect system engineering. Drawings shall additionally contain a site
location map drawn to scale, a north arrow, site coordinates, and
elevation and a graphic scale in both the English and metric system.

[Detailed configuration drawings.]{.underline} Drawings shall include
floor plan and equipment layout, cable tray system layout, rack face
elevation drawings, cable routing and wire run lists, and outside plant
installation details covering the systems identified in the following
paragraphs.

a.  [Radio systems.]{.underline} Plans shall include radio equipment,
    order wire and fault alarm, antennas, waveguides and dehydrators:
    voice, teletypewriter, mission, and supervisory multiplex, including
    multiplex synchronization plan; equipment power arrangement; and
    redundancy switching arrangements.

b.  [Telephone systems.]{.underline} Plans shall include outside plant
    cable runs, cable vaults, frame, telephone switches, and power
    subsystems including standby power.

c.  [Technical control facilities.]{.underline} Plans shall include
    order wire and fault alarm, status display equipment: patching,
    test, and conditioning equipment: inverters and battery plant: ac
    power equipment: and redundancy switching arrangements.

d.  [Communication center and data systems.]{.underline} Plans shall
    include teletypewriter, digital terminal, and peripheral equipment:
    message switches: timing and synchronization schematics and
    synchronization equipment: patch and switch panels filters and
    isolators: and power equipment including standby power.

e.  [Other systems]{.underline}. Plans shall include equipment peculiar
    to the project being implemented as identified in the specification
    or sow.

[Interface drawings.]{.underline} These drawings shall depict the
interface of the individual project subsystems to each other or to
circuits of special or unique nature. These drawings may be of the basic
block type and shall include such components as supergroup and group
equipment, filters, hybrids, amplifiers, and impedance matching devices.
The interrelation of the components shall be shown as they relate to the
ultimate operation of the subsystem. If levels and impedances to be
interconnected are not matched, the level and impedance transformation
shall be depicted on the drawings. Points of interface of equipment with
a subsystem or interface of one subsystem with another (to include
technical control interface) shall be defined.

[Major contractor furnished equipment (CFE) and Government]{.underline}

[furnished equipment (GFE).]{.underline} A major CFE and GFE Bill of
Material shall list the items required to implement the project,
including manufacturer, model or specification number, description,
quantity by site location, total quantity required for each item, and
other data as required for identification.

[Heat dissipation. power consumption and circuit breaker
requirements.]{.underline} This data shall include estimated heat
dissipation and power consumption of all equipment provided or installed
and circuit breaker characteristics (trip rating, number of poles, size
of conductor connected, and identification of power panels in which they
are mounted). Cooling, air handler, and air distribution requirements
for the heating loads shall be included.

[Description of facilities provided.]{.underline} Narrative description
with drawings shall be included for all modifications to existing
facilities and new construction.

[Description of power upgrade.]{.underline} This description shall
include single-line wiring diagrams with circuit breaker and power panel
requirements: primary, standby, and emergency system: stability of
electrical power and definition of allowable transients: auto or manual
and uninterruptible power supply information; and all electrical
characteristics such as voltage, current, phase, kilovolt ampere (kVA),
power factor.

[System radio frequency plan.]{.underline} The plan shall contain the
necessary technical inputs identified in 4. of AR 5-12 and shall be
presented as specified in Chapter 12 of DCAC 330-175-1.

[Electromagnetic compatibility control plan.]{.underline} This plan
shall conform to 4. of MIL-HDBK-237, to ensure that various project
elements are electromagnetic-compatible and that proper grounding,
bonding, shielding, and cabling criteria are observed. Tests and test
methods shall be as specified in 5 and Appendix C of MIL-HDBK-237.

[RED/BLACK considerations.]{.underline} RED/BLACK areas shall be clearly
defined. Description of areas which are considered limited-exclusion
areas, controlled access areas, controlled BLACK equipment areas, and
physical control zones shall be provided within the criteria of 4. and
5. of MIL-HDBK-232. Other pertinent design considerations to be
addressed include grounding, shielding, and filtering requirements to
comply with TEMPEST criteria as applicable. Other special considerations
to be addressed will be identified in the specification or sow.

[Electromagnetic pulse design consideration.]{.underline}
Electromagnetic pulse design consideration for the protection of
telecommunication equipment shall be clearly indicated with
justification for methods employed. Design guidance and constraints will
be identified in the specification or SOW.

[Description of testing concepts.]{.underline} A description and
discussion of testing concepts, approaches, and responsibilities shall
be included for system, link, and circuit testing as appropriate.

[Government. host country, or other action.]{.underline} All actions
required by agencies other than the system contractor to implement the
project such as right-of-way, Government-leased circuits, and radio
frequency authorization shall be identified and shall include site
location, responsible agencies, time requirements, and other data as
specified in the specification or SOW.

[Other design plans and software requirements.]{.underline}

a.  [Message switch design plan.]{.underline} This plan shall include
    definition of the switch and its operation to permit visualization,
    analysis, and evaluation of system reliability or maintainability,
    throughput capability, flexibility, and operations performance. The
    plan shall include the following:

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(1) Software design and rationale.

(2) Hardware selection, configuration, and rationale.

(3) General and detailed block diagram with narrative.

(4) Detailed procedures for:

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(a) Internal control and format.

(b) Message integrity, security, and accountability.

(c) Statistics control and accountability.

(d) Software recovery and restart.

(e) Files, lists, and table make-ups.

(f) Message retrieval and recovery.

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(5) Input and output interface characteristics parameters.

(6) Map of system memory (core layout), including overlays.

(7) Reliability computation and specification for each hardware
    component.

(8) Detailed discussion of traffic flow.

(9) Detailed plan for performance of software maintenance.

(10) Detailed plan for hardware maintenance.

(11) Storage requirements for software, files, tables and statistics,
     identifying each item of a type and requirement as to off or
     on-line storage.

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b.  Telephone numbering plan. This plan shall include user network and
    tie trunks to satisfy operational requirements outlined in the
    specification or sow.

c.  Other design plans and software requirements necessary to ensure the
    successful completion of the systems engineering effort will be
    identified in the specification or sow.

[Binding.]{.underline} Binding shall be consistent with the number of
pages and intended use of the manuscript. Generally submissions with
self-covers should use saddle stitching or side stitching (two staples
on the left side would be acceptable). Submissions with separate covers
may use side stitching, spiral, or plastic binder, or 3-ring binders as
may be required so that the submission will best serve its intended use.
For example, loose-leaf binding would be desirable where there is a
requirement for the submission to lie flat with no likelihood of the
sheets turning by themselves.

[Drawings.]{.underline} Drawings larger than page size shall be
furnished separately when 15 or more such drawings are included in the
Telecommunications System Engineering Plan. For the draft submittal
these drawings shall be furnished as full-sized reproductions. For the
final submission, the drawings shall be reduced to 1/2 x 14 inches and
shall be bound as outlined in 10.4 above. When fewer than 15 drawings
are provided, they shall be reduced and folded to conform to the page
size of the Telecommunications system Engineering Plan.

[Format.]{.underline} The Telecommunications Systems Engineering Plan
format shall be contractor selected. Unless effective presentation would
be degraded, the initially used format arrangement shall be used for all
subsequent submissions.