Isolated ModeWhen faults occur to a Master site and Backup master site, or when a Slave site is isolated because of networkfailure, the Slave site can continue limited communication services independently at its site.Master UnitSlave Unit(BackupMaster Unit)Slave UnitFaultITSPFaultSlave UnitIsolated Mode Isolated ModeMaster UnitSlave Unit(BackupMaster Unit)Slave UnitSlave UnitFaultITSPOne-look NetworkNoticeThe Slave unit will restart. Depending on the makeup of the network, it may take 15 minutes or more forthe unit to restart in Isolated mode.NoteThe Slave site can act in Isolated mode in the following conditions:• The connection to the Master site has failed.• The connection to the Backup master site has failed. (If a backup master exists in the One-look network)• The Isolated Mode setting is enabled in the Slave unit.LED IndicationOperatingStatusSlave UnitSTATUSLEDMASTERLEDNormal Green ON Amber ONIsolatedModeGreen ON RedFlashingFor more information about LED indications, refer to "LED Indications" in "4.3.1 Mother Board".Similarly, the System Alarm button set for the flexible button on the PT lights to indicate the PBX status haschanged, and a message will be displayed on the LCD on the PT.For details, refer to "5.6.4 Local Alarm Information" in the Feature Guide.336 Installation Manual8.4.2 One-look Networking Survivability
