AT&T System 75, Wiring Diagram

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CHAPTER 3. EQUIPMENT ROOM DESIGN
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Satellite Locations Using 66-Type Hardware
The 3-pair station circuits from the equipment room are terminated on
a 66-type connecting block in the satellite closet white field, and then
cross-connected to a 66-type connecting block in the blue field. The
4-pair station circuits from the information outlets are terminated on the
satellite closet blue field. The following 66-type connecting blocks can
be used in a satellite closet;
66M1-50 connecting block
157B connecting block
154A-type backboard
166A-type bakcboard
Station Circuit Distribution From Equipment Room
The following information explains the station circuit distribution from
the equipment room to the information outlets for new wiring
installations. Connection diagrams are provided to show the options for
running and connecting the station cables.
If most of the telephones/voice terminals that require remote powering
are within 250 feet of the equipment room, 4-pair station circuits are run
from the equipment room to the information outlets. If this is not the
case, or if the customer requires 2-point administration, 3-pair station
circuits are run from the equipment room to satellite locations. Then, the
4-pair station circuits are run from the satellite locations to the
information outlets.
4-Pair Station Circuits
Four-pair circuits can be run directly from an equipment room
cross-connect field to a 258A or BR2580A adapter as shown in Figure
3-64. The 4-pair station cables connect the adapter to the information
outlets.
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