Version 6.2 27 February 2011
Installation Manual 2. Installing the Device
2.4.6 Connecting to ISDN BRI Lines
The procedure below describes how to cable the ISDN BRI lines. This is applicable only if
the device is housed with BRI interfaces.
The device provides up to four BRI S/T ports (supporting up to 8 voice channels). These
ports connect to ISDN terminal equipment such as ISDN telephones. Each BRI port can be
configured either as termination equipment/user side (TE) or network termination/network
side (NT). Up to eight terminal equipment (TE) devices can be connected per BRI S/T port,
using an ISDN S-bus that provides eight ISDN ports. When configured as NT, the BRI port
drives a nominal voltage of 38 V with limited current supply of up to 100 mA.
The connector pinouts for the BRI port when configured as TE or NT are shown below:
Figure 2-17: RJ-45 Connector Pinouts for BRI Ports
Warning:
To protect against electrical shock and fire, use a 26 AWG min wire to
connect the BRI ports to the PSTN.
¾ To connect the BRI ports:
1. Connect the BRI cable to the device's BRI RJ-45 port.
2. Connect the other end of the cable to your ISDN telephone or PBX/PSTN switch.
Figure 2-18: Cabling BRI Ports
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