CHAPTER 7. ROUTINE MAINTENANCE

Power Failure

If commercial power fails, the system’s battery backup will keep the attendant console operating for a short time. When this time expires, the Power Failure Transfer feature will automatically activate, and the console will not operate. When power is restored, ” all consoles are restored to normal operation.

When power fails, all active calls and all calls on hold will be lost. Also, a power failure affects the following features and requires corrective action:

Attendant Control of Trunk Group Access— reestablish control of desired trunk groups.

Call Forwarding All Calls —reactivate Call Forwarding All Calls for desired extension numbers.

ŽControlled Restrictions—reestablish control of desired voice terminals or groups of voice terminals.

ŽNight Service— reactivate Night Service as desired.

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AT&T 75 manual Power Failure