Cisco 1751 - Manual (Page 65)

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-