AT&T 518-600-016 manual Connecting the Power Failure Telephone

CONNECTING THE POWER FAILURE TELEPHONE

A module that has outside line jacks also has at least one Power Failure Telephone (PFT) jack (Figure 2-26).If a power failure temporarily disables the MERLIN II system control unit and voice terminals, you can still gain access to an outside line through a basic Touch-Tone or rotary dial telephone that is plugged into the PFT jack on a module with outside line jacks.

When the power goes down, the basic telephone becomes active and uses the line number assigned to the lowest position line jack on the module. The top PFT jack on both the 408 and 800 modules uses the line number assigned to the fourth line jack from the top. The lower PFT jack on the 400 with DTMF module uses the line number assigned to the jack immediately above it.

To use any PFT jack properly, plug a basic telephone into it when the system is installed and be sure that the outside line jack to which the PFT jack bridges has an outside number assigned to it. If a line jack bridged by the PFT jack does not have a line number assigned to it, the PFT jack bridges to nothing in the event of a power failure, and you do not have access to an outside line.

NOTE: A MERLIN II system voice terminal will not work as a power failure telephone.

Connecting the Voice Terminals 2-97