AT&T System 75, Wiring Diagram

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Station Wiring Design
A brief description of each of the above listed items follows. The station
wiring labels and their use are described in Chapter 4. Ordering
information is not provided for station cables and information outlets.
The ordering information for this equipment is available in the Premises
Distribution System Equipment and Supplies Catalog.
Information Outlets
Information Outlets are 8-pin modular wall jacks. Most of the outlets are
wired with push-on connections. Information outlets are also available
that connect to a double modular plug-ended 4-pair station cable run
from the cross-connect field, a site/satellite location, or an adapter.
Station Cables
For clarity in describing the wiring in this guide, station cable is either
25-pair cable, multiple 25-pair cable, or 4-pair D-inside wire (DIW) run
from the equipment room, a site/satellite location, or an adapter to the
information outlets. The following types of station cable are available.
●
●
Connectorized 25-pair station cable—This cable is used between
the equipment room and the site/satellite locations or adapters.
For 110-type hardware, use an A25D cable (male to male)
between the equipment room and a satellite closet, and use a
B25A cable (male to female) between the equipment room and a
site closet or adapter. For 66-type hardware, use an A25B cable
(female to female) between the equipment room and a satellite/site
closet or adapter. The A25B cable is available with connectors on
each end (double-ended), and also with a connector on only one
end (single-ended). Use the single-ended cable when the leads
are punched down on the connecting blocks.
Connectorized multiple 25-pair station cable—This cable can be
used between the equipment room and the site/satellite locations
or adapters. This cable consists of individually sheathed 25-pair
cables with a factory-installed 25-pair connector on each end. For
110-type hardware, use a male to female cable to connect
between the equipment room and a site location or adapter, and
use a male to male cable to connect between the equipment room
and a satellite location. For 66-type hardware, use a female to
female cable to connect between the equipment room and a
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