Power Failure Transfer - AT&T MERLIN LEGEND System Reference Manual

Features

Power Failure Transfer

Description
Telephone Differences
Multiline Telephones
Single-Line Telephones
Considerations
Feature Interactions
Station Message Detail
Recoding
Hardware Requirements
2-276 Power Failure Transfer
Power Failure Transfer provides incoming and outgoing service through the use
of power failure telephones during a commercial power failure, or when the
voltage drops below 90 volts for longer than 250 ms.
A power failure telephone is a single-line telephone connected to a power failure
transfer (PFT) jack on a 400, 400 GS/LS/TTR, 800, 800 GS/LS, 408, or 408
GS/LS module. Each module has one PFT jack for a series of four line jacks.
When a power failure occurs, all calls are dropped and the power failure
telephone automatically goes on. It can be used to make and receive calls on
the line/trunk connected to the line jack in the lowest position in each series of
four. System features and restrictions are not available during a power failure.
Multiline telephones cannot be used as power failure telephones.
Touch-tone single-line telephones must be connected to line jacks with touch-
tone lines/trunks; rotary single-line telephones must be connected to line jacks
with rotary-dialing jacks.
The power failure telephone does not function and cannot be used to make
or receive calls when the system is operating normally.
During a commercial power failure, all calls are disconnected and no SMDR
records are generated for these calls.
If ground-start trunks are used in the Hybrid/PBX mode, a KS23566,L1
ground-start button (PEC 31021) is required for power failure telephones
(see Chapter 5).