MSBR Series 47 Mediant 800 MSBR
Hardware Installation Manual 6. Cabling the Device
6.5.3 Connecting the FXS Analog Lifeline
The device supports Analog Lifeline. If the device loses power, for example, due to a power
outage or the unplugging of its power cable, it automatically routes calls from a POTS
telephone ("lifeline" phone), connected to an FXS port, to the PSTN (instead of the IP
network).
The Lifeline is provided by FXS Port # 1. This port connects to the analog POTS phone and
the PSTN / PBX using an RJ-11 splitter cable. The Lifeline splitter connects pins 1 and 4 to
another source of an FXS port, and pins 2 and 3 to the POTS phone. The RJ-11 connector
pinouts are shown in the figure below.
Figure 6-16: RJ-11 Connector Pinouts for FXS Lifeline
To cable the FXS Lifeline:
1. Connect the Lifeline Splitter (supplied) to FXS Port 1.
2. On the Lifeline splitter cable, do the following:
a. Connect the analog telephone to Port A.
b. Connect an analog PSTN line to Port B.
Figure 6-17: Cabling FXS Lifeline
Notes:
• Analog Lifeline cabling is applicable only if the device is ordered with FXS interfaces.
• The number of supported Lifelines depends on the device’s hardware configuration.
For the combined FXS/FXO configuration, one Lifeline is available; for the 12-FXS
configuration, up to three Lifelines are available.
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