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Cisco Network Modules Hardware Installation Guide
OL-2485-20
Chapter 28 Connecting Cisco High-Density Extension Modules
Cisco High-Density Extension Module Cable Pinouts
Table 28-4 RJ-21 Connections for the Cisco High-Density Extension Module
RJ-21
Pin
Hardware Component
Base Card
Ports
Expansion Module Ports
8FXS/DID
EM-HDA-8FXS
EM-HDA-3FXS/4FXO EM-HDA-6FXO
EM-4BRI-NT/TE
26
Base card
(EVM-HD-8FXS
Port 0 Tip
—
—
—
—
1
Port 0 Ring
27
Port 1 Tip
2
Port 1 Ring
28
Port 2 Tip
3
Port 2 Ring
29
Port 3 Tip
4
Port 3 Ring
30
Port 4 Tip
5
Port 4 Ring
31
Port 5 Tip
6
Port 5 Ring
32
Port 6 Tip
7
Port 6 Ring
33
Port 7 Tip
8
Port 7 Ring
34
EM0
—
Port 8 Tip
FXS Port 8 Tip
Port 8 Tip
Port
x
/0 SX–
9
Port 8 Ring
FXS Port 8 Ring
Port 8 Ring
Port
x
/0 SX+
35
Port 9 Tip
FXS Port 9 Tip
Port 9 Tip
Port
x
/0 SR-
10
Port 9 Ring
FXS Port 9 Ring
Port 9 Ring
Port
x
/0 SR+
36
Port 10 Tip
FXS Port 10 Tip
Port 10 Tip
Port
x
/1 SX–
11
Port 10 Ring
FXS Port 10 Ring Port 10 Ring
Port
x
/1 SX+
37
Port 11 Tip
Unused
Port 11 Tip
Port
x
/1 SR-
12
Port 11 Ring
Unused
Port 11 Ring
Port
x
/1 SR+
38
Port 12 Tip
FXO Port 12 Tip
Port 12 Tip
Port
x
/2 SX–
13
Port 12 Ring
FXO Port 12 Ring Port 12 Ring
Port
x
/2 SX+
39
Port 13 Tip
FXO Port 13 Tip
Port 13 Tip
Port
x
/2 SR-
14
Port 13 Ring
FXO Port 13 Ring Port 13 Ring
Port
x
/2 SR+
40
Port 14 Tip
FXO Port 14 Tip
Unused
Port
x
/3 SX–
15
Port 14 Ring
FXO Port 14 Ring Unused
Port
x
/3 SX+
41
Port 15 Tip
FXO Port 15 Tip
PFP
1
Tip
Port
x
/3 SR-
16
Port 15 Ring
FXO Port 15 Ring PFP Ring
Port
x
/3 SR+