Installation & Maintenance Manual 44 Document #: LTRT-40111
Mediant 1000B SBA
6.4 Connecting to ISDN BRI Interfaces
This section describes how to connect to the ISDN BRI Interfaces.
6.4.1 Connecting to BRI Lines
The procedure below describes how to connect to BRI lines.
Warning: To protect against electrical shock and fire, use a 26 AWG min wire to connect
the BRI ports to the PSTN.
Note: The BRI module is a customer ordered item. This section is applicable only if your
device is installed with such a module.
To connect to BRI lines:
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.
A BRI port can be configured either as TE (Termination Equipment/user side) or NT
(Network Termination/network side). The connector pinouts vary according to the
configuration, as shown in the figure below.
Figure 6-6: RJ-45 Connector Pinouts for BRI
When configured as NT, the BRI port drives a nominal voltage of 38 V with limited current
supply of up to 100 mA. The voltage is of Power Source 1 type (line voltage). Power
Source 2 is optional.
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