AT&T administration and, Руководство по установке и обслуживанию

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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