3.14 Power Failure Connections3.14.1 Power Failure ConnectionsWhen the power supply to the PBX fails, power failure transfer (PFT) will switch from the current connectionto the Power Failure Connection. Refer to "13.1.11 Power Failure Transfer" in the Feature Manual for furtherinformation.ConnectionPower Failure Connection connects a specific SLT and a CO line in the event of power failure. The followingCO 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 (4PFT 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 maintainedeven when the power returns and the connection is switched back to the normal configuration from thePower Failure Connection. However, if no special programming is performed, the connection will bedropped when power returns.R2R1T1T2T2T1R1R2RJ11Co Line Card(e.g., ELCOT16)Extension Card(e.g., SLC8)To CO line To SLTAccessories and User-supplied ItemsAccessories (included): noneUser-supplied (not included): RJ11 connectorsDocument Version 2009-12 Installation Manual 1953.14.1 Power Failure Connections
