Installation Manual - Panasonic

2.9 Power Failure Connections2.9 Power Failure Connections2.9.1 Power Failure ConnectionsWhen the power supply to the PBX fails, power failure transfer will switch from the current connectionto the Power Failure Connections.Power Failure Connections connect a specific extension and an outside (CO) line in the event ofpower failure as follows:Outside (CO) line 1—extension (T, R) jack 01Notes• In the event of a power failure, system memory is protected by a factory-provided lithiumbattery. No system data will be lost, except for the Camp-on, Saved Number Redial, LastNumber Redial, and Call Park data.• The current connection automatically switches to the Power Failure Connection when thepower supply stops.• Proprietary telephones (PTs) cannot be used during a power failure. Therefore, werecommend connecting a single line telephone (SLT) in parallel with a PT to extension jack01.Note that if the parallelled SLT is on an outside (CO) line call when the power is restored,that call will be disconnected.• As long as DC power is provided by the backup batteries, the PBX will remain fullyoperational and the connection will not switch to the Power Failure Connections.Installation Manual 61