UFC 3 -520-01
June 10, 2002
568B requires a distance of the outlet to the endpoint device must be less than 3 meters
(10 feet), maximum distance from the telecommunications closet to the outlet is 90
meters (295 feet), and 7 meters (23 feet) cable length is allowed in the closet.
G-3.2.3.3 A facility that has significant communications and computer systems (C-CS)
requirements needs a CER. Unoccupied facilities and small fa cilities (<465 square
meters or <5,000 square feet) such as guardhouses, utility control buildings, storage
bunkers, etc. will normally not require a CER. The CER normally serves as the
entrance facility for all incoming C -CS ducts and service and as the main location for
C-CS equipment such as electronic key systems and main local area network
hubs/routers/servers.
G-3.2.3.4 The CER should be located on first floor with an exterior wall and be provided
with double doors (recommended door size: 1.8 meters wide by 2.4 meters high [6 feet
by 8 feet]) without a center support to ensure that large equipment can easily be moved
into the room. Due to the sensitivity of newer communications equipment to
electromagnetic i nterference, do not collocate CERs and TCs with utility services for
other facilities, such as HVAC, generators, or transformers. Table G-1 provides the
CER size requirements.
Table G-1. CER Size Requirements
Number of
Building Usable Square Meters
CER Size
CER Size
Entrance
(Square Footage)
(square feet)
(square meters)
Conduits
<1,858 (20,000)
400
37.2
2
1,858 to 9,290 (20,000 to 100,000)
500
46.5
4
9,290 to 18,580 (100,000 to 200,000)
900
83.6
5
Every additional 18,580 (200,000)
+600
+55.7
+1
Note: Not less than 2:1 ratio length to width.
G-3.2.3.5 A TC is required for each floor with 929 square meters (10,000 square feet) of
usable building footage in a facility. A TC serves as the interface from the CER to the
individual voice/data outlets in the facility and as a location for wiring hubs. Note that
the CER can also function as a TC for the area in the facility where it is located.
G-3.2.3.6 Locate the TC close to the center of the area to be served. It is critical that
the installed length of distribution cables (horizontal cable s) from the TC to user outlets
comply with distance requirements.
G-3.2.3.7 Minimum size for a TC is 3.1 meters by 2.1 meters (10 feet by 7 feet).
TIA/EIA -569, Chapter 7 discusses a TC's size, location, coverage area, horizontal
distances to work areas , floor loading (static and dynamic), excluded items and
equipment, lighting, wall coverings, door size, security, closet penetrations, fire safety,
and environmental considerations.
G-4
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