Hardware Installation Manual 44 Document #: LTRT-10764
Mediant 500 MSBR
5.5 ISDN BRI Interfaces
Note: BRI interface is a customer ordered item.
5.5.1 Connecting to BRI Lines
The device provides up to two BRI S/T ports, if ordered. 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.
Cable specification:
Cable: 26 AWG min. wire cable
Connector: RJ-45
Connector Pinouts:
Figure 5-11: 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.
To connect the BRI ports:
1. Connect the BRI cable to the device's BRI RJ-45 port, labeled S2 / PSTN BRI.
Figure 5-12: Cabling BRI Ports
2. Connect the other end of the cable to your ISDN telephone or PBX/PSTN switch.
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