MIL-HDBK-1191
11.4
COMMUNICATION DISTRIBUTION FACILITIES. Communications systems
distribution and support facilities will be provided as described herein:
11.4.1
Exterior.
Design of the exterior cable system will be interfaced
with the existing installation cable network and based on the requirements of
the project. All exterior cable will be installed underground to the extent
it is financially and physically feasible and not in conflict with the
installation architecture. The primary route from the new facility to the
Installation network will be a concrete encased duct bank to the nearest
available service point.
11.4.1.1
Funding. Funding for the facility will include the cost of the
cabling, duct bank, new manholes to connect to the nearest available
operational service point in the installation infrastructure system. Outside
plant cables should be used to provide communications service from the
Installation Dial Central Office, (DCO). Project funds for new outside plant
cables will be used when no existing outside plant cable is available. The
additional cost of outside plant cabling required for communications systems
to connect to the nearest available service point on each system will be
included with the new facility.
11.4.1.2
Design Considerations. The number and size of conduits installed
will provide for current needs and for reasonable future expansion. Design
will be based on the forecasts for the telephone system line and trunk load
and all other cable systems using the duct bank. The design analysis shall
include the basis for conduit quantities used. Design of duct bank and
manholes shall be based on ANSI/TIA/EIA 758.
11.4.2
Interior.
11.4.2.1
Cable Tray. Provide cable trays above the suspended ceilings in
the corridors for all communications systems cables. Cable trays shall be
located just above the ceiling and shall be designed and installed to insure
ease of accessibility for future wiring changes. Cable trays in medical
facilities with Integrated Building Systems (IBS) will be located in the
distribution zone (see section 19). A minimum one inch conduit pathway will
be provided from each communication system outlet to the cable tray.
11.4.2.2
Communications Rooms and Closets. The communications
rooms/closets will be sized and provided utility support in accordance with
EIA/TIA 569. Communications rooms/closets shall be a minimum of 100 square
feet each. Equipment installed in these rooms/closets will be shown on plan
and elevation drawings. In multistory facilities, communications
rooms/closets will be provided on each floor and vertically aligned to
facilitate connection of all communication system riser conduits and wiring.
Utility outlets will be on a dedicated circuit of the equipment branch of the
emergency power system. Each equipment location will be provided with
appropriate dedicated AC power. See section 10 for power system information.
Insure that AC power from the appropriate emergency power branch is provided
for each communication system. A penthouse equipment room, when required in
hospitals and medical centers, shall be provided. This room is usually on
the top of the building or in a large mechanical space on the top floor of the
building. The room is used to house radio equipment for the radio paging
system, the television system and the ambulance emergency medical system
(EMS). Also provide conduit penetrations to antennas for coaxial cables and
emergency power for equipment in accordance with Table 11-1.
11-2
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