Avaya IP Office Phone Manager, Installation Manual, Page: 355 / 411

IP Office Installation Page 354
15-601042 Issue 20b (16 July 2009) IP Office
10.12.4 BRI Port (So)
The BRI ports found on the front of the So8 module are BRI So interface ports for connect to ISDN terminal devices.
For IP Office 4.2+, IP500 BRI trunk daughter cards can be switched from To to So mode. IP400 BRI trunk cards can only
be used as
To connections .
IP Office Wire ISDN Terminal
BRI RJ45 BRI PIN RJ45
1 – White/Orange 1
2 – Orange/White 2
3 Rx-A White/Green 3
4 Tx-B Blue/White 4
5 Tx-A White/Blue 5
6 Rx-B Green/White 6
7 – White/Brown 7
8 – Brown/White 8
•
Terminating Resistors
100ohm Terminating resistors are required across the transmit and receive wire pairs at each end of the S-bus.
•
The IP Office So8 module BRI ports include integral 100ohm terminating resistors.
•
For IP Office 4.2+, individual ports of an IP500 BRI daughter card can be switched to So mode. This is done by
setting the
Line Sub-Type to S-Bus in the IP Office configuration. In this case terminating resistors must be
added at the IP Office end in addition to those at the other end of the S-bus connection.
•
Addition of the necessary termination at the IP Office end can be done using an IP500 BRI So Converter Cable
(700458649). This short (25cm/10") cable includes both the necessary terminating resistors and the cable
cross-over.
•
Many ISDN terminal devices includes terminating resistors. If this is not the case, 100ohm (+/-5%) resistors must
be connected across the receive wire pair and the transmit wire pair in the junction box immediately before the
last ISDN terminal on the S-bus.