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 "13.1.11 Power Failure Transfer" in the Feature Manual for further
information.
Connection
Power Failure Connection connects a specific SLT and a CO line in the event of power failure. The following
CO line and extension cards can be used for Power Failure Connections:
• Analog CO line card: ELCOT16 (4 PFT ports)
• Extension card: EMSLC16 (4 PFT ports), ESLC16 (4 PFT ports), ECSLC24 (4 PFT ports), CSLC16 (4
PFT ports), DHLC8 (2 PFT port) and SLC8 (2 PFT port)
To 1 analog CO line card, connect only 1 extension card.
Note
• Power Failure Connections must be made within the same shelf.
• 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.
R2
R1
T1
T2
T2
T1
R1
R2
RJ11
Co Line Card
(e.g., ELCOT16)
Extension Card
(e.g., SLC8)
To CO line To SLT
Accessories and User-supplied Items
Accessories (included): none
User-supplied (not included): RJ11 connectors
Document Version 2009-12 Installation Manual 195
3.14.1 Power Failure Connections