The threshold value which the measured object's value crosses causes the alarm to be cleared. The behaviour of a measured value and alarm threshold comparison is defined by the object sub10UnitMgmtAlarmThreshType. The sub10UnitMgmtAlarmClearThresh value may be different to the sub10UnitMgmtAlarmRaiseThresh allowing some hysteresis bewteen raising and clearing of alarms thus avoiding an alarm being continually raised and cleared if the measured value is changing frequently around the threshold. If different raise and clear thresholds are not required then the sub10UnitMgmtAlarmClearThresh and sub10UnitMgmtAlarmRaiseThresh should be set to the same value.