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Cable Specifications and Information
Pin
8
6
7
8
Analog Voice RJ-21 Pinouts
The following figure shows RJ-21 connector wiring for a 50-pin Amphenol cable.
Figure 23: RJ-21 Connector Wiring
The following table lists the pinouts for the RJ-21 connector.
Table 25: Pinouts for FXS and FXO Voice Ports
Pair
1
2
3
OL-31292-01
Signal
Descri p t i o n
Two-Wire Operation, Type
1
2
T or
Tip,
T
T
T1
audio
i n put / o ut p ut
or
output
T
Tip,
—
—
audio
input
E-lead
Signaling
E
E
output
SG
Signaling
—
SG
ground
return
Ring Conductor
1
2
3
Cisco VG310 and Cisco VG320 Voice Gateways Hardware Installation Guide
Four-Wire Operation, Type
3
4
1
T
T
T1
—
—
T
E
E
E
SG
—
—
Tip Conductor
26
27
28
Analog Voice RJ-21 Pinouts
2
3
4
T1
T1
T1
T
T
T
E
E
E
SG
SG
—
77
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