Downindicates that the connection in at least one direction on a bidirectional link is degraded to the point of no longer passing traffic.

The East/West directionality for each topological link is determined during discovery.

The symptoms for DropSideTopologicalLink Down are as follows:

  • LOS on the PTP connected to the DropSideTopologicalLink

  • RFI on the PTP connected to the DropSideTopologicalLink

  • Signal Failure (SF) on the receiving PTP connected to the DropSideTopologicalLink