3.12 Power Failure Connections3.12.1 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 "2.4.1 Power Failure Transfer" in the Feature Guide for furtherinformation.NoteWhile DC power is provided by the backup batteries, the PBX will remain fully operational and theconnection will not switch to the Power Failure Connection.Using Analogue Trunk Card and Extension CardPower Failure Connection connects a specific SLT and a trunk in the event of power failure. The followinganalogue trunk and extension cards can be used for Power Failure Connections:• Analogue trunk cards: LCOT16 (4 PFT ports), LCOT8 (2 PFT ports), and LCOT4 (2 PFT ports)• Extension cards: MSLC16 (4 PFT ports), CSLC16 (4 PFT ports), SLC16 (4 PFT ports), DHLC8 (2 PFTports) and SLC8 (2 PFT ports)To 1 analogue trunk card, connect only 1 extension card.NoteBy programming the PBX, a trunk conversation established during power failure can be maintained evenwhen the power returns and the connection is switched back to the normal configuration from the PowerFailure Connection. However, if no special programming is performed, the connection will be dropped whenpower returns.Trunk Card(e.g., LCOT8)Extension Card(e.g., SLC8)R2R1T1T2T2T1R1R2RJ11To trunk To SLTAccessories and User-supplied ItemsAccessories (included): noneUser-supplied (not included): RJ11 connectors166 Installation Manual3.12.1 Power Failure Connections
