Facility alarm hierarchy

Facility alarms for children objects is not raised for failure of a parent object. For example, when an MDA or XMA fails (or is shutdown) there is not a set of port facility alarms raised.

When a parent facility alarm is cleared, children facility alarms that are still in occurrence on the node appears in the active facility alarms list. For example, when a port fails there is a port facility alarm, but if the MDA or XMA is later shutdown the port alarm is cleared (and a card alarm is active for the MDA or XMA). If the MDA or XMA comes back into service, and the port is still down, then a port alarm becomes active once again.

The supported facility alarm hierarchy is as follows (parent objects that are down cause alarms in all children to be masked):

Note: A masked facility alarm is not the same as a cleared facility alarm. The cleared facility alarm queue does not display entries for previously raised facility alarms that are currently masked. If the masking event goes away, then the previously raised facility alarms are visible again in the active facility alarm queue.
Parent topic: Facility alarms