RJ-21X I/O Module
1-8
Cisco VCO/4K Mechanical Assemblies
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.
Figure 6: RJ-21X I/O Module Wiring Plan
25
50
26
1
50-Pin
Miniature
Jack
(Female)
T
R
To Network
2-Conductors
Per Circuit
Line/Trunk
Tip
Ring
1A
2A
3A
4A
5A
6A
7A
8A
1B
2B
3B
4B
5B
6B
7B
8B
1C
2C
3C
4C
5C
6C
7C
8C
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
DIN-A
Line/Trunks
1A thru 8A
DIN-B
Line/Trunks
1B thru 8B
DIN-C
Line/Trunks
1C thru 8C
P1
P2
P3
J1
J2
J2
Faceplate
PCB Assembly