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B-7
Cisco 1751 Router Hardware Installation Guide
78-11258-04
Appendix B Cabling Specifications
Cables and Pinouts for 2-Port ISDN BRI Card
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 the interface is configured as NT and is connecting to a TE device, the cable
must have the transmit and receive pins swapped (crossover cable). (See
Table 6
.)
Table 6
Interface Pin Numbers and Functions
ISDN BRI NT/TE
NT Interface (use
straight-through cable)
TE Interface (use
crossover cable)
Pin 3/T+
Pin 3/R+
Pin 3/T+
Pin 4/R+
Pin 4/T+
Pin 4/R+
Pin 5/R-
Pin 5/T-
Pin 5/R-
Pin 6/T-
Pin 6/R-
Pin 6/T-