26 DBS 576 (USA), issued March 1999 576-25-700Chapter 3. System Features Section 700 - OperationBattery BackupDescriptionWhen backup batteries are installed, the System will continue to operate in the event of a powerfailure. If using Battery Backup, backup batteries must be installed in each cabinet.A fully loaded system will operate at least 30 minutes on backup batteries.Hardware Requirements• Back-up battery unit (VB-44025)Related Programming• N/AConsiderations• Any device connected to the System but that does not derive its power from the System musthave a backup power source to operate. These devices include any System Message DetailRecording (SMDR) printer (or recorder), fax machine, answering machine, modem, cordlesstelephone, etc.Building Block Expansion CapabilityDescriptionThe System is designed to support easy expansion. Each cabinet in the System supports 96 ports (12flexible slots) as well as 2 option slots. Up to 6 cabinets may be installed in the System for a total of576 ports.Up to 2 expansion cabinets may be connected to a base cabinet. When a fourth cabinet is required,another base cabinet is installed. Up to 2 expansion cabinets may be connected to the second basecabinet.This building block approach allows you to easily add equipment when needed without a majorinterruption in service or a major delay.Hardware Requirements• N/ARelated Programming• N/AConsiderations• In addition to the additional cabinets and related cabinet hardware/cabling required forexpansion, when the System is expanded the CPC card and/or TSW cards may need to beupgraded as well. The CPC96 supports up to 96 ports. The CPC288 supports up to 288 ports andshould be combined with time switch card TSW288. The CPC-576 supports up to 576 ports andshould be combined with time switch card TSW576.