Cisco VCO/4K Mechanical Assemblies page 68

RJ-21X I/O Module
The wiring plans correspond with the USOC specifications for analog circuits and AT&T wiring
for T1 digital lines. Refer to the Cisco VCO/4K Site Preparation Guide for additional
information. Figure 6 shows the RJ-21X module wiring plan.
DIN-A
Line/Trunks
1A thru 8A
DIN-B
Line/Trunks
1B thru 8B
To Network
2-Conductors
Per Circuit
1-8 Cisco VCO/4K Mechanical Assemblies
P1
P2
DIN-C
P3
Line/Trunks
1C thru 8C
T
50
R
J2
26
50-Pin
Miniature
Jack
(Female)
Figure 6: RJ-21X I/O Module Wiring Plan
PCB Assembly
J1
Line/Trunk Tip
1A 26
2A 27
3A 28
4A 29
5A 30
25
6A 31
7A 32
8A 33
1B 34
2B 35
3B 36
4B 37
5B 38
6B 39
7B 40
8B 41
1C 42
1 2C 43
3C 44
4C 45
5C 46
6C 47
7C 48
8C 49
Faceplate
J2
Ring
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24