Example of a Router Receiving Both an AIS-L and AIS-P Alarm

In Figure 16, the X indicates that the LOS or LOF occurs in the section between ADM2 and Repeater2.

All diagnostics are from the perspective of Router2 (the Juniper Networks router).

Figure 16: Example of a Router Receiving Both an AIS-L and an AIS-P Alarm

What It Means

In Figure 16, the progression of events occurring after the failure is as follows:

1. Repeater2 detects an LOS or LOF on the incoming section.
2. Repeater2 sends an AIS-L and AIS-P downstream to Router2.
3. Router2 receives both an AIS-L and an AIS-P from Repeater2.