AT&T System 75, Wiring Diagram

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CHAPTER 3. EQUIPMENT ROOM DESIGN
and either 384 three-pair station circuits (white or blue field) or 288
four-pair station circuits (blue field).
188D2
BACKBOARD
188D2
BACKBOARD
FILL
BLUE OR WHITE PURPLE BLUE OR WHITE
CAPACITY WHITE FIELD =
CAPACITY BLUE FILED =
CAPACITY PURPLE FIELD =
384 3-PAIR CIRCUITS
288 4-PAIR CIRCUITS OR
384 3-PAIR CIRCUITS
384 3-PAIR CIRCUITS
Figure 3-4. Distribution Field Arrangement of 110-Type
Hardware—Eight 300-Pair Terminal Blocks
Figure 3-5 shows a typical 900-pair terminal block configuration of
110-type hardware arranged for use in the distribution field. This
configuration will terminate 576 three-pair port circuits (purple field),
and either 576 three-pair station circuits (white or blue field) or 432
four-pair station circuits (blue field).
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