2.4 Fault Recovery/DiagnosticsFeature Guide 4332.4 Fault Recovery/Diagnostics2.4.1 Power Failure TransferDescriptionWhen the power supply to the PBX fails, specific SLTs and/or ISDN terminal devices are automaticallyconnected to specific trunks (Power Failure Connections). The PBX will switch from normal operation tothe Power Failure Connections, and all existing conversations will be disconnected.Only the trunks handled by Power Failure Connections can be used during a power failure.Conditions[General]• Only trunk calls can be made during a power failure. All other features do not work.• DC Power SourceIf the DC power is available from backup batteries, even if the AC power fails, the PBX will remain fullyoperational.[KX-TDA600]• The analogue trunk cards and extension cards, as well as the number of PFT ports (ports which canbe used for Power Failure Connections) are as follows:Trunk Cards: ELCOT16 (4 PFT ports)Extension Cards: EMSLC16 (4 PFT ports), ESLC 16 (4 PFT ports), DHLC8 (2 PFT ports), SLC 8 (2PFT ports)Only connect one extension card to each trunk card.NotePower Failure Connections must be made within the same shelf. An extension card cannot have aPower Failure Connection with a trunk card of another shelf.Through system programming, it is possible to allow trunk calls that are established during a powerfailure to be maintained even when the power returns and the connection is switched back to thenormal configuration from the Power Failure Connection. However, if no special programming isperformed, the connection will be dropped when power returns.• The BRI8 (one PFT port) and BRI4 (one PFT port) cards can also be used for Power FailureConnections. For details about Power Failure Connections, refer to the Installation Manual.[KX-TDA100/KX-TDA200]• The analogue trunk cards and extension cards, as well as the number of PFT ports (ports which canbe used for Power Failure Connections) are as follows: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 (2PFT ports) and SLC8 (2 PFT ports)Only connect one extension card to each trunk card.
