3.12 Power Failure Connections

3.12.1 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 "13.1.11 Power Failure Transfer" in the Feature Manual for further
information.

Using Analog CO Line Card and Extension Card

Power Failure Connection connects a specific SLT and a CO line in the event of power failure. The following
analog CO line and extension card can be used for Power Failure Connections:
•Analog CO line card: LCOT4 (1 PFT port)
•Extension card: DHLC4 (1 PFT port)
To 1 analog CO line card, connect only 1 extension card.
Note
By programming the PBX, a CO line 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.
RJ45
RT
TR
Extension Card
(DHLC4)
CO Line Card
(LCOT4)
To CO line
To SLT
Accessories and User-supplied Items
Accessories (included): none
User-supplied (not included): RJ45 connectors
106 Installation Manual Document Version 2011-10
3.12.1 Power Failure Connections