Cable Specifications

Cable Specifications

Synchronous Serial Cable Assemblies and Pinouts

ISDN BRI Port and Cable Pinouts

Table A-13 lists the ISDN BRI port pinouts. The straight-through RJ-45-to-RJ-45 cable, used to connect to the ISDN BRI port, is not included.

Table A-13. BRI Port (RJ-45) Pinout

RJ-45

TEb

NTc

Polarity

8 Pina

 

 

 

3

Transmit

Receive

+

 

 

 

 

4

Receive

Transmit

+

 

 

 

 

5

Receive

Transmit

–

 

 

 

 

6

Transmit

Receive

–

 

 

 

 

a.Pins 1, 2, 7, and 8 are not used.

b.TE refers to terminal terminating layer 1 aspects of TE1, TA, and NT2 functional groups.

c.NT refers to network terminating layer 1 aspects of NT1 and NT2 functional groups.

A-20