Section 700 - Operation Chapter 3. System Features576-36-700 DBS 576 (USA) issued October 2000 3-49Power Failure TransferDescriptionPower 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). Inthe 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 (VB-43703)• An SLT that will be connected to the PFU.Related Programming• N/AConsiderations• 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 fora limited amount of time. With maximum traffic, the backup batteries last up to 30 minutes in theDBS 576.Power On MaintenanceDescriptionThe System allows you to change most circuit cards, programming, and many other maintenancefeatures while the System is powered on and operating. Very few operations require the System to bepowered down or out of service. The System therefore continues to operate without interruption formost maintenance functions.A limited number of items such as the replacement of some common control circuit cards requires thesystem to be powered down.Hardware Requirements• N/ARelated Programming• N/AConsiderations• N/A
