Specifications

Cable Specifications C-23
ISDN BRI Port and Cable Pinouts
ISDN BRI Port and Cable Pinouts
Table C-15 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.
1. Pins 1, 2, 7, and 8 are not used.
2. TE refers to terminal terminating layer 1 aspects of TE1,
TA, and NT2 functional groups.
3. NT refers to network terminating layer 1 aspects of NT1
and NT2 functional groups.
J1-24
J1-23
TxC/RxC+
TxC/RxC–
Twisted pair no. 4 —>
—>
J2-6
J2-13
Timing+
Timing–
J1-15
Shield
Control_GND
–
Twisted pair no. 5 –
–
J2-8
Shield
Control GND
–
Table C-15 BRI Port (RJ-45) Pinouts
RJ-45
8 Pin
1
TE
2
NT
3
Polarity
3 Transmit Receive +
4 Receive Transmit +
5 Receive Transmit –
6 Transmit Receive –
Table C-14 X.21 DCE Cable Pinouts (DB-60 to DB-15) (Continued)
60 Pin Signal Description Direction 15 Pin Signal