B-5
Cisco 1760 Modular Access Router Hardware Installation Guide
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AppendixB Cabling Specifications
Cables and Pinouts for 2-Port ISDN BRI Card
The E&M VIC pinout depends on the PBX type and connection. Table B -5 lists
the pinouts for the E&M connector.
Note Pins that are not used should not be connected.
Cables and Pinouts for 2-Port ISDN BRI Card
Use the straight-through RJ-45 cable to connect the 2-port ISDN BRI card to an
ISDN network through a telephone wall outlet or other device.
Note When an interface configured as network termination (NT) is connecting to a
terminal equipment (TE) device, the cable must have the transmit and receive pins
swapped (crossover cable). (See Table B -6.)
TableB-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