This object is used to specify a severity level associated
with the low warning threshold given by the
cOpticalParamLowWarningThresh object. The values 'critical',
'major', and 'cleared' do not apply.
The severity level configured in this object must be lower
than the level configured in the cOpticalParamLowAlarmSev
object.
If this object is set to 'notReported', no notifications will
be generated when this threshold is exceeded, irrespective
of the value configured in the cOpticalNotifyEnable object.