Power-Failure Transfer - Lucent Technologies MERLIN LEGEND Release 7.0 Feature Reference

MERLIN LEGEND Communications System Release 7.0
Feature Reference 555-670-110
Features

Power-Failure Transfer

Power-Failure Transfer
At a Glance
Modes
Telephones
Hardware
Description
During a commercial power failure, Power-Failure Transfer (PFT) provides
incoming and outgoing service through power-failure telephones. When a power
failure occurs, all calls are dropped and the power-failure telephone automatically
goes on. It can make and receive calls on the line/trunk connected to the first
(lowest) line/trunk jack on the module where the PFT telephone is connected.
A power-failure telephone is a single-line telephone connected to a PFT jack on a
400 (LS), 400 LS/TTR, 800 (LS), 800 GS/LS, 800 GS/LS-ID, 408 (LS-ATL), 408
GS/LS, or 408 GS/LS-MLX module. Each module has one PFT jack for each
series of four line/trunk jacks; for example, the 800 (LS) and 800 GS/LS modules
each have two PFT jacks.
Unlike other line/trunk modules, the 412 LS-ID-ETR module (Release 7.0 and
later systems) does not have a dedicated jack for a power-failure telephone.
Instead, in the event of a power failure, the top extension port automatically
becomes a tip/ring port and receives dial tone from the first loop-start line port.
You then can plug in a single-line telephone to make calls outside the system. You
cannot use an ETR or MLS telephone.
Considerations and Constraints
A power-failure telephone cannot be used to make or receive calls and does not
function when the system is operating normally.
System features and restrictions do not work when PFT occurs. Power-failure
telephones are not working extensions but only dedicated power-failure devices.
All
Single-line telephones
If ground-start trunks are used in Hybrid/PBX mode,
KS23566, L1 ground-start buttons are required on power-
failure telephones.
Issue 1
April 1999
507