Figure 2-25. Power Failure Did Busy-Out Connections - AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual

Hardware Components

Figure 2-25. Power Failure DID Busy-Out Connections

Power Failure Transfer Telephone
A PFT telephone is a single-line telephone connected to a PFT jack on a 400,
400/GS/LS/TTR, 408, 408, GS/LS, 408 GS/LS-MLX (Release 2.0 only), 800, or
800 GS/LS module. In the event of a power failure, the system shuts off and the
PFT telephone automatically connects to the associated outside
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 must be added to each PFT telephone. If power
fails, this button is used when the number is dialed. If the button is used
with modular 2500 sets, the button should be wired from the wall jack.
If rotary lines/trunks are used, rotary telephones must be used as PFT
telephones.
2-60 Power-Related Hardware
line for making