This attribute provides the threshold value which defines when a
critical alarm would be issued, denoting a sustained total average
link utilization. The total average link utilization is calculated based
on the number of received bytes. The Set alarm is issued after 3
minutes of utilization greater than the given threshold. The
corresponding Clear alarm is issued after a subsequent 3 minutes of
utilization less than or equal to the given threshold.
The value 100% is used to disable an individual threshold. For
values other than 100%, a semantic check ensures that the critical
alarm threshold is greater than the other thresholds.