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

Problem

Figure 16shows a router receiving both an IS-L and AIS-P Alarm. The X indicates that the LOS or LOF occurs in the section between ADM 2 and Repeater 2.

Solution

All diagnostics are from the perspective of Router 2 (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:

Repeater 2 detects an LOS or LOF on the incoming section.
Repeater 2 sends an AIS-L and AIS-P downstream to Router 2.
Router 2 receives both an AIS-L and an AIS-P from Repeater 2.