5.4 ISDN BRI Interfaces
This section describes how to cable the BRI interfaces.
5.4.1 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.
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 interfaces are a separate orderable item.
Cable specifications:
Cable: 26 AWG min.
Connector Type: RJ-45
Connector Pinouts:
Figure 5-10: RJ-45 Connector Pinouts for BRI Ports
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