AT&T System 75, Wiring Diagram

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CHAPTER 3. EQUIPMENT ROOM DESIGN
66-Type Hardware Requirements
Table 3-F lists the amount of 66-type hardware required to provide 1-,
2-, 3-, or 4-pair distribution for station wiring. Each 66-type connecting
block can terminate 25-pairs. The quantity of blocks required per switch
depends on the number of pairs required per station.
Table 3-F. 66-Type Hardware Requirements
66M 150
Station Range
Blocks
1-Pair 2-Pair 3-Pair
4-Pair
Required
Wiring* Wiring* Wiring Wiring
1 1-24
1-12 1-8 1-6
2 25-48 13-24 9-16 7-12
3
59-72 25-36 17-24 13-18
4 73-96 37-48 25-32 19-24
5 97-120
49-60
33-40
25-30
6
121-144
61-72
41-48
31-36
7 145-168 73-84 48-56 37-42
8
169-192
85-96 57-64
43-48
9
193-216 97-108 65-72 49-54
10 217-240
109-120
73-80 55-60
11
241-264 121-132 81-88 61-66
12 265-288 133-144 89-96
67-72
13 289-312 145-156 97-104
73-78
14 313-336 157-168 105-112
79-84
15
337-360 169-180 113-120 85-90
16 361-384 181-192 121-128 91-96
17 385-408
193-204 129-136 97-102
18
409-432 205-216 137-144 103-108
19
433-456 217-228 145-152
109-114
20
457-480 229-240 153-160 115-120
* 1- and 2-pair wiring is used only for analog
telephones.
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