Alarm Indication Signal - a signal, associated with a
maintenance alarm detected on a defective maintenance
span, that is transmitted in the direction of the defect
as a substitute for the normal signal.  Its purpose is to
show downstream entities that a defect has been identified,        so that other maintenance alarms consequent to this first
defect can be inhibited.  The external bit stream
representation of AIS may be an all 1s signal.

Remote Alarm Indication - a signal transmitted upstream
from a terminal that has detected defects persisting long
enough to constitute a received signal failure.  Its purpose
is to report in the backward direction that there is an
interruption of service in the forward direction.

Alarm Indication Signal - a signal transmitted in the
downstream direction from the AAL type 2 connecting point
that first detects a defect affecting the AAL type 2
connection; this includes defects indicated by lower layers.

Remote Defect Indication - a signal transmitted upstream by
an AAL type 2 endpoint that is in an alarm state as the result
of having received an AAL type 2 connection AIS or having
detected a defect that affects the AAL type 2 connection.

Indicates the the status of the PVC has gone down.

This trap is generated when the number of Bad Sequence errors
exceeds the aal2AlarmConfigThreshCellLoss for a 15-minute interval.
A bad sequence error is detected when some cells have been lost.

This trap is generated when the number of congestion events
exceeds the aal2AlarmConfigThreshCongestion for a 15-minute interval.

A notification is sent when the operational status of an ELCP interface 
group changes.