If the power supply to the PBX fails, specific single line telephones (SLTs) are automatically connected to specific CO lines (Auxiliary Connections). The PBX will switch from the current connections to Auxiliary Connections, and all existing conversations will be disconnected.
Only CO line conversations handled by Auxiliary Connections can be made during a power failure.

•

The analog CO line cards, extension cards, and the number of ports which can be used for Auxiliary Connections are as follows:
CO Line Cards: LCOT16 (four ports) and LCOT8 (two ports).
Extension Cards: MSLC16 (four ports), SLC16 (four ports), DHLC8 (two ports) and SLC8 (two ports).
Connect only one extension card to one CO line card.

Note

Auxiliary Connections between analog CO line cards and extension cards should be done as per system programming so that conversation is maintained when the power is restored and the MPR is recovering.

•

Only CO line conversations are possible during a power failure. All other features will not work.

Installation Manual

2.11.1 Auxiliary Connection for Power Failure Transfer

When the electricity is turned back on, the PBX restarts, loads its stored data automatically, and logs the event as a System Restart in the error log.

•	In the event of a power failure, PBX memory is protected by a factory-installed lithium battery. There is no memory loss except the memories of Automatic Callback Busy (Camp-on) ( 1.7.1 Automatic Callback Busy (Camp-on)) and Call Park ( 1.12.2 Call Park).

When the PBX detects an error, the System Alarm button on the proprietary telephone (PT) of an extension which is allowed to use this feature through system programming (a maximum of two extensions per PBX), lights red. Pressing the button will show the error number on the display. If multiple errors occur, the error number will be displayed in order of highest priority to lowest. The System Alarm button light turns off automatically after all error numbers have been displayed.
For details regarding errors and their solutions, refer to the Installation Manual.

[Error Example]

[Explanation]

Number in the Example

Item

Description

(1)

Error Code

Shows three-digit error code.

(2)

Sub Code

Shows five-digit sub code (XYYZZ).
X: Cabinet number (1—4)
YY: Slot number (00—11)
ZZ: Physical port number (01—16)

•	System Alarm Button Any flexible button can be customized as the System Alarm button.
•	If an extension allowed to utilize this feature uses PC Console or PC Phone, the alarm information will also be displayed on the PC.
•	If an extension allowed to utilize this feature uses PC Console or PC Phone, the alarm information will be sent to the preprogrammed party via PC Console or PC Phone. PC Console and PC Phone use e-mail to send the information.
•	The alarm information will be logged on the Station Message Detail Recording (SMDR) if enabled through system programming.
•	The PBX can be automatically diagnosed at a preprogrammed time everyday.