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3.14 Power Failure Connections
220 Installation Manual
3.14 Power Failure Connections
3.14.1 Power Failure Connections
When the power supply to the PBX fails, power failure transfer (PFT) will switch from the current connection
to the Power Failure Connection. Refer to "2.4.1 Power Failure Transfer" in the Feature Guide for further
information.
Note
While DC power is provided by the backup batteries, the PBX will remain fully operational and the
connection will not switch to the Power Failure Connection.
Using Analogue Trunk Card and Extension Card
Power Failure Connection connects a specific SLT and a trunk in the event of power failure. The following
analogue trunk and extension cards can be used for Power Failure Connections:
• Analogue trunk cards: LCOT16 (4 PFT ports), LCOT8 (2 PFT port), and LCOT4 (2 PFT port)
• Extension cards: MSLC16 (4 PFT ports), SLC16 (4 PFT ports), DHLC8 (2 PFT port) and SLC8
(2 PFT port)
To 1 analogue trunk card, connect only 1 extension card.
Note
By programming the PBX, a trunk conversation established during power failure can be maintained
even when the power returns and the connection is switched back to the normal configuration from the
Power Failure Connection. However, if no special programming is performed, the connection will be
dropped when power returns.
Accessories and User-supplied Items
Accessories (included): none
User-supplied (not included): RJ11 connectors
Trunk Card
(e.g., LCOT8)
Extension Card
(e.g., SLC8)
R2
R1
T1
T2
T2
T1
R1
R2
RJ11
To trunk To SLT