92 Appendix A Technical specifications

Table 27 provides the pinouts for the ADSL Annex B cable.

Table 27 ADSL Annex B cable pinouts

RJ-11 termination

 

RJ-45 termination

 

 

 

 

Signal

Pin # to Pin #

Signal

 

 

 

 

 

 

 

 

N/C

1

6

N/C

 

 

 

 

Tip

2

5

Tip

 

 

 

 

Ring

3

4

Ring

 

 

 

 

N/C

4

3

N/C

 

 

 

 

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 38 shows the ISDN BRI S/T interface card or the ISDN BRI U interface card. The two look identical.

Figure 38 ISDN BRI S/T or IDSDN BRI U

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 sold as Category 5, or Ethernet, cables.

Note: Nortel does not supply a cable with the ISDN BRI interface cards.

NN46110-318 02.01

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Nortel Networks 2750 Isdn BRI interface card, Provides the pinouts for the Adsl Annex B cable, Adsl Annex B cable pinouts