This attribute specifies the threshold value at which a critical alarm
will be issued based on a sustained average ATM VCC utilization as
indicated by the lastCalculatedVccUtilization attribute. The Set
alarm is issued after 3 minutes of utilization greater than the
threshold. The corresponding Clear alarm is issued after a
subsequent 3 minutes of utilization less than or equal to the
threshold.
The value 200% is used to disable this threshold. For values other
than 200%, the critical alarm threshold must be greater than the
other thresholds.