Panasonic DBS 824 Manual page 549

Power Failure Transfer
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Considerations
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A Single Line Telephone Adapter (VB-40709) is required to provide
analog ports 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 824 Backup batteries provide full telephone service
and system features to all DBS 824 extensions for a limited amount of
time
With maximum traffic, the backup batteries last up to 40 minutes
DBS 824-l O-700
System Features
Issue Date 3/i/95