CHAPTER5 Cabling the Device
Mediant 1000 Gateway & E-SBC | Hardware Installation Manual
Figure 5-14: 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.
➢ To connect to BRI lines:
1. Connect the RJ-45 connector on one end of the cable to the port on the device's BRI
module.
2. Connect the other end of the cable to your ISDN telephone or PBX/PSTN switch.
Connecting the PSTN Fallback for BRI Lines
The device supports PSTN Fallback for BRI lines. If the device loses power, for example, due to a
power outage or the unplugging of its power cable, it automatically routes calls from the Tel
side to the PSTN (instead of the IP network).
PSTN Fallback is supported only on BRI modules that provide two or four spans. In the event of
a PSTN fallback, the BRI module's metallic relay switch automatically connects line Port 1 (I) to
Port 2 (II), and / or line Port 3 (III) to Port 4 (IIII) of the same BRI module.
For example, if a PBX trunk is connected to Port 1 and the PSTN network is connected to Port 2,
when PSTN Fallback is activated, calls from the PBX are routed directly to the PSTN through Port
2.
➢ To connect the BRI line interfaces for 1+1 PSTN Fallback:
1. Connect line 1 to a PBX.
2. On the same BRI module, connect line 2 to the PSTN.
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