Hardware Installation Manual 48 Document #: LTRT-10229
Mediant 800 MSBR
6.6 ISDN BRI Interfaces
6.6.1 Connecting to BRI Lines
The device provides up to four BRI S/T ports. 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
Connector: RJ-45
Connector Pinouts:
Figure 6-18: RJ-45 Connector Pinouts for BRI Ports
Warning:
• BRI port cabling must be routed only indoors and must not exit the building.
• To protect against electrical shock and fire, use a 26 AWG min wire to connect the
BRI ports to the PSTN.
Note: BRI interface is a customer-ordered item.
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 6-19: Cabling BRI Ports
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