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

In Figure 18, the X indicates that the LOS occurs in the section between Repeater2 and Router2.

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

Figure 18: Example of a Router Receiving Both an RDI-L and RDI-P Alarm

What It Means

In Figure 18, the progression of events occurring after the failure is as follows:

1. Repeater2 detects an LOS on an incoming section.
2. Repeater2 sends an AIS-L downstream to ADM2.
3. ADM2 sends an RDI-L upstream to Router2.
4. ADM2 sends an AIS-P downstream to Router1.
5. Router1 sends an RDI-P upstream to Router2.
6. Router2 receives both RDI-P and RDI-L alarms.