Cisco 1751 - Manual (Page 64)

Appendix B Cabling Specifications
VIC Cables and Pinouts
B-6
Cisco 1751 Router Hardware Installation Guide
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Table B-4 lists the pinouts for FXS and FXO VIC connectors.
Note Pins that are not used should not be connected.
The E&M VIC pinout depends on the PBX type and connection. Table B-5 lists
the pinouts for this connector.
Note Pins that are not used should not be connected.
Table B-4 RJ-11 Pinouts
Pin Signal
1 –
2 –
3 Ring
4 Tip
5 –
6 –
Table B-5 E&M Pinouts
Pin Signal Description
1 SB –48V signaling battery
2 M-lead Signaling input
3 R Ring, audio input
4 R or R1 Ring, audio input/output,
or output
5 T or T1 Tip, audio input/output,
or output
6 T Tip, audio input
7 E-lead Signaling output
8 SG Signaling ground return