Technical Requirements -
T/D Cabling Design Guide
6. Telephone/Data (T/D) Closets
T/D Closets provide the facility where backbone cabling and horizontal cabling
are cross-connected. There will be at least one T/D closet on each floor.
Closets on successive floors will be stacked vertically and connected by sleeved
holes through the floor slab. To determine the number and location of
Government provided T/D closets and sleeves, reference the materials
identified in Contractor Responsibilitiesof this document.
7. Horizontal Cabling - Telephone and Data
Horizontal cabling runs between the T/D Closets and the Work Station Interface
(WSI) outlets. Category 5 UTP cabling shall be provided for this purpose. There
may also be horizontal data cabling runs terminating on a network equipment in
the Computer Room, reference the materials identified in Contractor
Responsibilities of this document.
A. Pathways
Horizontal cabling shall be installed in Government provided cable trays
suspended in the ceiling or under raised access floors, or be installed in
concrete imbedded floor ducts. The Contractor shall not use under carpet
flat wiring.
B. Maximum Cable Length
The cable length from a T/D closet to its furthest WSI outlet shall not exceed
295 feet (including service loops).
C. Terminations
In the T/D closets, the telephone cables shall be terminated in Category 5
compliant, 110 IDC cross-connect blocks mounted on the Government
provided Backboards and the data cables shall be terminated on Category
5-compliant 110 type RJ45 rack mounted, patch panels. Only those data
cables identified as active shall be provided with Category 5 compliant,
RJ45 patch cables for connection to the Government provided network
electronics - typically a hub or switch.
D. Color Conventions
The outer jacket color of the telephone cable shall be consistent throughout
the installation. The outer jacket color of the data cable shall be consistent
throughout the installation. The outer jacket color of the telephone cable shall
be different from the data cable.
E. Special Horizontal Telephone Cabling
To provide access to the EPABX for Computer Room modem and
telephone circuits, a number of 4 pair UTP Category 5 horizontal cables shall
be installed from the MDF to designated telephone outlets in the Computer
Room. The number shall be determined by the materials identified in
VBA Design Guide
Page 4-39
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