CHAPTER 5 Cabling the Device
MP-1288 | Hardware Installation Manual
Figure 5-14: Connecting FXS Interfaces Directly to MDF
Connecting the FXS Analog Lifeline
The device supports PSTN Fallback (analog Lifeline), whereby it automatically connects an FXS
port (Lifeline extension or phone) to the PSTN / PBX upon a power outage. This enables the
phone to make and receive calls to and from the PSTN respectively, instead of the IP network.
Each FXS blade supports up to three FXS Lifelines, one per FXS connector. For each connector,
the first channel provides the connection to the Lifeline extension and the last channel is the
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