14 July 2004
Including changes 12 April 2005
and TR may be combined into a single room. Switches or routers and
associated patch panels are included in cabinets.
Telecommunication Rooms (TR). Telecommunications rooms
should be dedicated to telecommunications function and should not house
unrelated electrical equipment. There must be at least one TR per floor. If the
area served is over 1000 m2 (10,000 ft2), there should be additional TRs on the
floor. If the total cable distance to the work area is over 90 m (295 ft), there must
be additional TRs on the floor. All distances must be calculated in accordance
with ANSI / TIA / EIA 568-B.1.
Commonly, the NMCI TPP is installed in the TR. NMCI typically
does not install transformers or other electrical equipment that would change the
room type or effect the operation of the network equipment. Other equipment
such as piping, ductwork or pneumatic tubing must not be installed in, pass
through or enter into the room. For new facilities, the NMCI TR function must be
combined with the overall telecommunication system room designs in
accordance with MIL-HDBK 1012/3. New construction contracts must include
language within the contract documents that allows the NMCI contractor to install
equipment prior to beneficial occupancy.
Location. The ideal space for a typical TR will be near the
building's EF for telecommunications infrastructure and must be within 90 m (295
ft) of the seats/users to be served. This is cable distance and not physical
separation on the floor. Telecommunication Rooms should be located away from
heaters, arc welders, radio, radar) such that interference is less than 3 V/m
across the frequency spectrum. Generally, separate rooms with equipment
located on opposite walls will satisfy this requirement. Avoid areas subject to
The TR must be located as close as practicable to the center of the
area being served, and preferably in the core of the building.
In multi-floor buildings, TRs must be stacked vertically
Size of TRs. Cabinets within TRs normally require a minimum of
6106 mm (24.0 in) of clearance to the front and rear of the cabinet although 914
mm (36.0 in) is preferred. The Uniform Federal Accessibility Standards (UFAS)
and Americans with Disabilities Act Accessibility Guidelines (ADAAG) requiring
914 mm (36.0 in) clearance between equipment in telecommunication rooms is
excluded under Section 4.1.4, paragraph 4, "General Exceptions" in UFAS and
under Section 4.1.1, paragraph 5 "General Exceptions" in the ADAAG. The
NFPA 70 requirement for 914 mm (36.0 in) of workspace for electrical junction
points and pull boxes still applies.