Ground-Start Button; Power Failure Transfer - AT&T MERLIN LEGEND System Reference Manual

Functional Description

Power Failure Transfer

A power failure transfer (PFT) telephone is a single-line telephone connected to
a PFT jack on a 400, 400/GS/LS/TTR, 800, 800 GS//LS, 408, or 408 GS/LS
module. In the event of a power failure, the system shuts off and the PFT
telephone automatically connects to the associated outside line for making and
receiving calls.
Notes:
The PFT jack does not operate unless a power outage occurs or the power
supply units are turned off.
A single-line telephone connected to an MFM cannot be used as a PFT
telephone.
If PFT telephones are to be connected to ground-start lines/trunks, a
ground-start button (see figure 4-11) must be added to each PFT
telephone.
If rotary lines/trunks are used, rotary telephones must be used
as PFT telephones.
Figure 4-11

Ground-Start Button

Power Failure Transfer 4-37