2.4 Fault Recovery/DiagnosticsFeature Guide 1832.4 Fault Recovery/Diagnostics2.4.1 Power Failure TransferDescriptionIf the power supply to the PBX fails, specific single line telephones (SLTs) are automatically connected tospecific outside (CO) lines (Power Failure Connections). The PBX will switch from the current connectionsto Power Failure Connections, and all existing conversations will be disconnected. Only outside (CO) line calls handled by Power Failure Connections can be made during a power failure.Conditions• During a power failure, each of the following outside (CO) lines will be connected to an assignedextension.Outside (CO) line 1: extension jack 01Outside (CO) line 4: extension jack 09Outside (CO) line 7: extension jack 17• Only outside (CO) line calls are possible during a power failure. All other features will not function.• We recommend connecting an SLT in parallel at extension jacks 01, 09, and 17, so that the SLT can beused during a power failure.• Automobile-type batteries, which must be user-supplied, can be connected as a system backup powersupply to operate all the features during a power failure.The batteries can be connected directly to the unit with optional cables. For more information, refer tothe Installation Manual.Installation Manual References2.2.6 Connecting Backup Batteries2.9 Power Failure ConnectionsFeature Guide References1.10.9 Parallelled Telephone
