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2.4 Fault Recovery/Diagnostics
196 Feature Guide
2.4 Fault Recovery/Diagnostics
2.4.1 Power Failure Transfer
Description
If the power supply to the PBX fails, specific single line telephones (SLTs) are automatically connected to
specific outside (CO) lines (Power Failure Connections). The PBX will switch from the current connections
to 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 assigned
extension.
Outside (CO) line 1: extension jack 01
Outside (CO) line 4: extension jack 09
Outside (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 be
used during a power failure.
Note that if the parallelled SLT is on an outside (CO) line call when the power is restored, that call will
be disconnected.
• Automobile-type batteries, which must be user-supplied, can be connected as a system backup power
supply 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 to
the Installation Manual.
Installation Manual References
2.2.6 Connecting Backup Batteries
2.9 Power Failure Connections
Feature Guide References
1.10.9 Parallelled Telephone