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
BRI
• 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.
IP Office Installation
IP Office
RJ45
BRI
1
–
2
–
3
Rx-A
4
Tx-B
5
Tx-A
6
Rx-B
7
–
8
–
Wire
White/Orange
Orange/White
White/Green
Blue/White
White/Blue
Green/White
White/Brown
Brown/White
ISDN Terminal
PIN
RJ45
1
2
3
4
5
6
7
8
15-601042 Issue 20b (16 July 2009)
Page 354