For IP Office 4.2+, IP500 BRI trunk daughter cards can be switched from To to So mode.

IP Office

Wire

ISDN Terminal

RJ45

Pin

BRI

PIN

RJ45

port_rj45

1

–

White/Orange

1

port_rj45

2

–

Orange/White

2

3

rxRx-A

White/Green

3

4

txTx-B

Blue/White

4

5

txTx-A

White/Blue

5

6

rxRx-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.

•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.