AT&T System 75, Wiring Diagram

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Station Wiring Design
Table 3-I provides detailed wiring information for the 25-pair cables, the
adapters, and the information outlets.
Note: Bridged taps must not be allowed on any part of the station
wiring.
Table 3-I. System Wiring
25-Pair Cable 4-Pair Cable
Voice Term Lead Functions
BR2580A
or
500,*
7400 EIA D-Inside 258A D-Inside
2500,
Series Term* Cable Adapter Cable Info.
Term. 7100 7300 Att.
PDM Color
Pin
Color Outlet
No. Series Series
Cons. TDM Code Num. Code Term.
1
T V1T
W-BL
26 W-BL
1
R V1 R BL-W 1 BL-W 2
CT TXT TXT W-O 27 W-O 3
CR TXR TXR O-W
2 O-W 4
P- PXT PXT W-G
28 W-G 5
P + PXR
PXR G-W 3
G-W
6
P- P-
W-BR 29 W-BR 7
P +
P + BR-W 4 BR-W 8
2
T V1T
W-S 30 W-BL 1
R V1R S-W 5 BL-W
2
CT TXT
TXT
R-BL
31 W-O
3
CR TXR TXR
BL-R
6 O-W
4
P- PXT PXT R-O
32
W-G
5
P + PXR
PXR O-R 7 G-W 6
P-
P-
R-G
33
W-BR 7
P +
P+ G-R 8
BR-W 8
3 T
V1T
R-BR 34 W-BL 1
R
V1R BR-R
9 BL-W 2
CT TXT TXT R-S
35 W-O
3
CR TXR
TXR S-R
10
O-W
4
P- PXT
PXT
BK-BL 36
W-G
5
P + PXR PXR BL-BK
11 G-W 6
P-
P- BK-O 37
W-BR 7
P +
P + O-BK 12
BR-W 8
* R1V2/V3 Only
3-105