Isolated ModeIf no PBX is designated as the Backup Master unit, or if the Backup Master unit also goes offline, Slave unitswill operate in Isolated mode if they are set to do so.In Isolated mode, each PBX will provide service to the extensions registered to it and for the trunk linesconnected to it.Master UnitSlave Unit(Backup Master Unit)PBX OfflinePBX OfflinePBX PBX IsolatedmodeIsolatedmode: Current Connection: Lost ConnectionConditionsIMPORTANTIn Backup Master mode and Isolated mode, there are no restrictions on performing software upgrades(® 5.5.9 Software Upgrading). However, if an upgrade is applied while any unit is offline, the offline unitwill no longer be able to participate in the One-look network because its software version will be differentfrom the other PBXs’ software version.• When the Master unit (or Master Backup unit) recovers, it does not automatically reassume operation asthe Master unit. Operation must be resumed manually through Web Maintenance Console.• When operation switches modes (e.g., normal operation to Backup Master operation), service at all sitesis temporarily interrupted. For example, all active calls will be disconnected, including P2P calls.• Activation keys are copied and are available to the Backup Master unit or Isolated units for use in theirrespective modes. However, trial activation keys will not be available. Copied activation keys are valid for10 days, starting when the unit begins operation. When operation is returned to normal, this 10 day limitis reset.• During normal operation, system data is copied from the Master unit to all Slave units. System data includesinformation such as extension settings, system speed dialling, time mode, etc.System data is copied from the Master unit to the designated Backup Master unit as soon as Backup Masteroperation is enabled through system programming.System data is copied from the Master unit to Slave units whenever system data is saved. Data is savedwhen the programmer clicks the save button in Web Maintenance Console and when the programmer logsout of Web Maintenance Console. Data is also saved automatically every 30 minutes.Feature Guide 3494.2.3 One-look Networking Survivability
