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APPENDIX A: System Wiring Tables
Table A-A.
25-Pair Connector Pin Assignments
25-Pin Corm.
Call
GS LS
Tlp Ring ATL
MET
Backplane
Pin No.
Wire Proc.
Trunk
Trunk Line
Line
Line
Pin No.
Color ZTN82 N76 ZTN77
ZTN78
ZTN79
TN735
(Slots 1-12)
.
26
W-BL
RDA
T1
T1
T1
T1
T1 102
1
BL-W SGA RI
RI RI
R1
R1
002
27
w-o
CT1
BTI
103
2
o-w
DCDA
CR1 BR1
003
28
W-G
DTRA
P-1
LT 1
104
3
G-W
TDA
P+l
LTR 1
004
29
W-BR
RDB
T2
T2
T2
T2
T2
105
4
BR-W
SGB
R2 R2 R2
R2
R2
005
30
w-s
CT2
BT2
106
5
s-w
DCDB
CR2
BR2
006
31
R-BL
DTRB
P-2
LT2
107
6
BL-R
TDB
P+2
LTR2
007
32 R-O RDC
T3
T3
T3 T3
T3
108
7
O-R SGC
R3
R3 R3
R3
R3
008
33
R-G
CT3 BT3
109
8
G-R
DCDC
CR3
BR3
009
34
R-BR
DTRC
P-3
LT3
110
9 BR-R
TDC
P+3
LTR3
010
35
R-S RDD
T4
T4
T4
T4
T4
111
10
S-R SGD
R4
R4
R4
R4
R4
011
36
BK-BL
CT4
BT4
112
11
BL-BK
DCDD
CR4
BR4
012
37
BK-O
DTRD
P-4
LT4
113
12
O-BK
TDD
P+4
LTR4 013
38
BK-G
T5
T5
T5
T5 302
13
G-BK
R5
R5 R5
R5
202
39 BK-BR
CT5
303
14
BR-BK
CR5
203
40
BK-S
P-5 3(M
15
S-BK
P+5 204
41
Y-BL
T6
T6
T6
T6
305
16
BL-Y
R6
R6 R6
R6
205
42
Y-o
CT6 306
17
o-Y
CR6
206
43
Y-G
P-6 307
18
G-Y
P+6
207
44
Y-BR
T7
T7
T7
T7 308
19
BR-Y
R7
R7
R7
R?
208
45 Y-s
ETU48
CT7
309
20 s-Y
ETUGD
CR7
209
46
V-BL ETU48
P-7
310
21
BL-V
ETUGD
P+7
210
47
v-o
T8
T8
T8
T8
311
22
o-v
R8
R8 R8
R8
211
48
V-G
ETU48
CT8
312
23
G-V
ETUGD
CR8 212
49
V-BR
ETU48
P-8 313
24 BR-V
ETUGD
P+8
213
50
v-s
GND GND GND GND
GND
300
25 s-v
GND GND
GND
GND
GND
200
Note: TN747 is same as ZTN76 and ZTN77. TN762 is same as ZTN79.
A-2