Section 700 - Operation
Power Failtire Transfer
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Paging cannot be heard at busy extensions or at extensions for which the
Do Not Disturb, Call Forwarding, or Absence Message feature is activated.
You can answer Paging from an idle extension by dialing the Meet-Me
Answer code ("77") during a page or if in a call, placing the call on hold
and dialing "77."
This feature provides telephone service to a limited number of SLTs during a
power failure. The SLTs are connected to the CO via a Power Failure Unit
In the event of a power failure, the power failure extensions have dial tone
directly from the CO; system features and restrictions do not apply.
Power Failure Unit (VA-43703)
An SLT that will be connected to the PFU.
Up to four SLTs can be connected to one Power Failure Unit.
If a call is in progress through the PFU when the power is restored, the call
will be disconnected.
For added protection against power outages, backup batteries can be
installed in the DBS. Backup batteries provide full telephone service and
system features to all DBS extensions for a limited amount of time.
With maximum traffic, the backup batteries last up to 40 minutes for the
DBS 40 and 72, and up to 30 minutes for the DBS 96.
DBS Manual - Issued 8/l/95
Chapter 2. System Features