Connecting the FXS Analog Lifeline Phone

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).

Analog Lifeline is supported only on FXS modules.
An analog Lifeline can be setup for each FXS module installed in the chassis.

The analog Lifeline is provided only by Port I on an FXS module. This port connects to the POTS phone and the PSTN or PBX, using a splitter cable. The splitter cable connects pins 1 and 4 to another source of an FXS port, and pins 2 and 3 to the POTS phone, as shown in the following figure:

Cabling specifications:

Cable: Splitter cable adaptor with RJ-11 on one end and two RJ-11 jacks on the other
Connector: RJ-11
Connector Pinouts:

RJ-11 Connector Pinouts for Analog Lifeline

To cable the analog Lifeline:
1. Connect the RJ-11 connector on one end of the Splitter cable (supplied) to Port I on the FXS module.
2. Connect the Lifeline POTS phone using an RJ-11 connector cable to Port A on the Lifeline Splitter.
3. Connect an analog PSTN line using an RJ-11 connector cable to Port B on the Lifeline Splitter.

Cabling the Analog Lifeline