Nortel BCM 3.7, Manual

Page: 289 / 1004

Setting BRI for ISDN device connections 289
Programming Operations Guide
Setting BRI for ISDN device connections
BRI S-loops support devices that use an ISDN interface. You can assign a single device to a loop,
or multiple devices connected through an NT-1 interface (
“Using an NT-1 for BRI U2/BRI U4” on
page 278 ).
• You can assign a maximum of eight devices to a loop.
• Any device can only be configured to one loop.
• S-loops do not supply any voltage for ISDN devices requiring power, such as video cameras.
Voltage for these devices must be supplied by an external source on the S-loop.
Wiring internal connections
The following diagram shows how to wire the BRI to connect to such S-Loop devices as video
phones, terminal adapters, and Grp 3 Fax machines.
Figure 76 BRI RJ45 wiring array
8 7 6 5 4 3 2 1
BRI connector
RJ45 sockets
Pin #/connection System side
1 not used
2 not used
3 +RX
4 +TX
+TX
+RX
5 - TX
6 -RX
- RX
-TX
7 not used
8 not used