AT&T System 75, Wiring Diagram

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Planning
Site or Satellite Closets
When determining the location of site or satellite closets, use the
following information as a guide. Show the locations on the floor plan.
a.
b.
c.
d.
e.
Keep the number of locations to a minimum.
Centrally locate the site or satellite closets among the information
outlets to minimize station wiring distances.
Site or satellite closets must be easily accessible and contain
enough ac power receptacles to serve the equipment that will be
located there. Voice terminals equipped with adjuncts that require
power can be remotely powered from:
●
a site or satellite location
●
from the main equipment room
●
information outlets.
The distance between the power supply and the voice terminal
cannot exceed 250 feet of 24-gauge wire.
Locks should be provided for the site or satellite closet doors to
prevent tampering with the equipment.
Cabling Facilities
The method of riser cable distribution between the main equipment
room and site or satellite closets is usually determined by the type of
cabling facilities (riser closets, conduit size, cabling shafts, etc.) in the
building (Figure 1-6).
a.
b.
The preferred arrangement is to have individual cables supply each
site or satellite closet.
A second method is to have one or two large cables supply all the
site or satellite closets. This requires that smaller cables be installed
between the main riser cable and the site or satellite closet. These
smaller cables are then spliced into the main cable.
Determine the type of cabling required and mark the type and routing on
the floor plan. Also, show any additional cabling facilities required for
riser and terminal cabling.
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