AT&T System 75, Wiring Diagram

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CHAPTER 3. EQUIPMENT ROOM DESIGN
rounded up (for example: 2.4 = 2 cable slack managers and 2.5 = 3
cable slack managers required).
110-Type Hardware and Patch Cord Requirements
Table 3-D lists the amount of 110-type hardware required to provide 1-,
2-, 3-, or 4-pair distribution for the station wiring. The 110-type terminal
blocks are available in various sizes and the number of stations
connected to each block depends on the number of pairs that are run
per station.
Table 3-D. 110-Type Hardware Requirements
Station Wiring
Available
Block Pairs
1-Pair
Wiring*
2-Pair
Wiring*
3-Pair
Wiring
4-Pair
Wiring
75 75 36 24 18
100 100 48 32 24
300 300 144 96
72
900
900
432
288
216
* 1- and 2-pair wiring is only possible for analog telephones that
are cross-connected using 110A-type hardware.
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