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82 Appendix A Technical specifications
NN46110-308 02.01
ISDN BRI interface card
The ISDN BRI S/T and ISDN BRI U interface cards have a single RJ-45
connector that provides the signals needed to interface to ISDN equipment. (To
connect the ISDN S/T interface to the ISDN network, you must attach an external
NT-1 device to the RJ-45 connector.)
Figure 27 shows the ISDN BRI S/T interface card and the ISDN BRI U interface
card. The two cards look identical.
Figure 27 ISDN BRI S/T interface card and ISDN BRI U interface card
The connector on the ISDN BRI S/T and ISDN BRI U interface cards
accommodates an 8-pin RJ-45 modular patch cord. These cables are commonly
sold as Category 5, or Ethernet, cables.
Table 21 provides the ISDN BRI S/T cable pinouts.
Note: Nortel does not supply a cable with the ISDN BRI interface cards.
Table 21 ISDN BRI S/T cable pinouts
Pin Function
1N/C
2N/C
3 Receive +
4 Transmit +
5 Transmit -
6 Receive -
7N/C
8N/C