Technical Requirements -
T/D Cabling Design Guide
Gas Tube Protection is required on all cable pairs that enter the building. If the
cable pairs are not protected, the Contractor shall provide the protection.
2. Telephone Equipment Room Main Distribution Frame
The Main Distribution Frame (MDF) is located in Telephone Equipment Room.
The Telephone Equipment Room is typically located near or adjacent to the
Computer Room and contains the Entrance Demarcation cross-connects, the
EPABX, the MDF cross-connects, and the Operator's Console.
The MDF is used as the central distribution point for telephone backbone cables
routed to each of the Telephone/Data closets. The MDF is also the point where
the EPABX is cross-connected to the CDS risers.
3. Computer Room - Data Distribution Facility
The Computer Room is typically located near or adjacent to the Telephone
Equipment Room. It is used as the central distribution point for data backbone
cables routed to each of the Telephone/Data closets. A portion of the Computer
Room may also function as a Telephone/Data closet for horizontal data cables
routed to service data outlets in the vicinity of the Computer Room.
4. Backbone - Telephone
A Category 3 UTP telephone backbone shall be installed in Government
provided conduits and riser sleeves between the Telephone Equipment Room
MDF and the Telephone/Data closets. All cables provided shall be listed as
being suitable for this purpose and marked accordingly per Article 800 of the
NEC.
Multi-pair copper conductors shall be formed into units of unshielded twisted
pairs. Units shall be assembled into binder groups of 25 pairs following the
standard industry color code (ANSI/ICEA S-80-576). The groups shall be
assembled to form the core that shall be enclosed with a thermoplastic outer
jacket. The outer jacket may contain an underlying metallic shield and one or
more layers of dielectric material over the core.
5. Backbone - Data
The fiber optic (FO) backbone cable shall be installed, between the Computer
Room and the Telephone/Data closets, in 1" innerduct. The pathways are the
Government provided conduits and pull boxes in the ceiling plenum space and
sleeved holes in the ceiling/floor slabs. Twelve fibers (one twelve strand or two 6
strand cables) shall be provided to each Telephone/Data closet.
Page 4-38
VBA Design Guide
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