Technical Requirements -
T/D Cabling Design Guide
7. Fiber Optic Backbone Cable
A. Electrical Parameters
The Fiber Optic Backbone cable shall meet Fiber Distributed Data Interface
(FDDI) bandwidth requirements and multimode wavelength of 850/1300
Nanometers. The cable shall be 62.5/125 micron core/clad diameter, with a
buffer diameter of 900 Microns. It shall conform to the attenuation
requirements of ANSI/EIA/TIA-568-A. The cable shall contain a minimum of
12 fiber strands and shall not exceed a distance of 2000 meters (6,560 ft.) in
a single run.
B. Protection & Termination
All fiber optic cable runs shall be installed in Contractor-provided one-inch
"inner duct." For each 12 strand run, six strands shall be terminated at each
end with ST connectors and the remaining six strands shall be terminated at
each end in SC connectors. These connectors shall be connected to
compatible 12 port fiber breakout boxes or fiber patch panels. VBA IRM
staff concurrence is required to verify that the six ST and six SC combination
is compatible with the network equipment to be connected.
CONTRACTOR RESPONSIBILITIES
The Government will provide the Contractor with Facility drawings and a Network
Survey that specifies the locations, types, and totals of equipment to be connected
by the CDS. The Network Survey may also specify a network excess capacity to be
provided for future growth or work station reconfiguration: 20 % is recommended.
Using these materials, the Contractor shall be responsible for the design,
procurement, installation, and successful testing of a CDS that is compatible with
the Network Survey and space & cable pathway constraints (Computer Room and
Telephone Equipment Rooms, Telecommunication closets, conduits, wireways,
cable trays, floor ducts, and interstitial spaces) reflected in the Facility drawings.
In the event the Contractor, Contracting Officer and COTR agree that a given
pathway is inadequate, the Government will increase the number or size of the
pathway in a mutually agreed upon manner.
1. CoordinationOf CDS Installation Activities
All CDS installation activity shall be fully coordinated with the COTR or
designate, as well as the General Building Construction Contractor so that
coordination of the CDS with its physical interfaces is maintained (e.g.: raised
floor, ceiling, HVAC ducts, sprinkler system, furniture installer, electrical, drywall).
VBA Design Guide
Page 4-35
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