A - 4 – AT&T System 25 User Manual
Page 290
APPENDIX A: System Wiring Tables
Table A-B. Building Wiring
25-Pair Cable
4-Pair Cable
Term. Lead Functions
5 0 0
ATL
7 1 0 1 A Cordless
D-Inside
D-Inside
Cable
Conn. C a b l e
Conn.
Ckt.
2 5 0 0 7300H
RS-232C
Color
P i n
Color
Block
No. Series
S e r i e s
Term ,
code
Num.
code
Term.
1
T
T
W-BL
26
W-BL
1
R
R
BL-W
1
BL-W
2
CT
w-o
27
w-o
3
CR
TXR
o-w
2
o-w
4
P-
PXT
W-G
28
W-G
5
P+
PXR
G w
3
G-W
6
W-BR
29
W-BR
7
BR-W
4
BR-W
8
2
T
T
w-s
30
W-BL
1
R
R
s-w
5
BL-W
2
CT
R-BL
31
w-o
3
CR
TXR
BL-R
6
o-w
4
P-
PXT
R-O
32
W-G
5
P+
PXR
O-R
7
G-W
6
R-G
33
W-BR
7
G-R
8
BR-W
8
3
T
T
R-BR
34
W-BL
1
R
R
BR-R
9
BL-W
2
CT
TXT
R-S
35
w-o
3
CR
TXR
S-R
10
o-w
4
P-
PXT
BK-BL
36
W-G
5
P+
PXR
BL-BK
11
G-W
6
BK-O
37
W-BR
7
O-BK
12
BR-W
8
4
T
T
BK-G
38
W-BL
1
R
R
GBK
13
BL-W
2
CT
TXT
BK-BR
39
w-O
3
CR
TXR
BR-BK
14
o-w
4
P-
PXT
BK-S
40
W-G
5
P+
PXR
S-BK
15
G-W
6
Y-BL
41
W-BR
7
BL-Y
16
BR-W
8
5
T
T
Y-o
42
W-BL
1
R
R
O-Y
17
BL-W
2
CT
Y-G
43
w-o
3
CR
TXR
G-Y
18
o-w
4
P-
PXT
Y-BR
44
W-G
5
P+
PXR
BR-Y
19
G-W
6
Y-s
45
W-BR
7
S-Y
20
BR-W
8
A - 4