58 DBS 576 (USA), Revised 6/11/98 576-13-700
Chapter 3. System Features Section 700 - Operation
Considerations
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Power Failure Transfer
Description
Power Failure Transfer provides telephone service to a limited number of Single Line Telephones
(SLTs) during a power failure. The SLTs are connected to the CO via a Power Failure Unit (PFU). 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.)
Hardware Requirements
• PFU (VA-43703)
• An SLT that will be connected to the PFU.
Related Programming
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Considerations
• Up to four SLTs can be connected to one PFU.
• For added protection against power outages, backup batteries can be installed in the System.
Backup batteries provide full telephone service and system features to all System extensions for
a limited amount of time. With maximum traffic, the backup batteries last up to 30 minutes.
Power On Maintenance
Description
The System allows you to change most circuit cards, programming, and many other maintenance
features while the System is powered on and operating. Very few operations require the System to be
powered down or out of service. The System therefore continues to operate without interruption for
most maintenance functions.
A limited number of items such as the replacement of some common control circuit cards requires the
system to be powered down.
Hardware Requirements
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Related Programming
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Considerations
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