This holds the major-low alarm threshold configured for the Attenuator Setting parameter, in dB. If currentValueRelAttenSetting falls below this threshold, the module raises a majorLowAlarm condition reflected in alarmStateRelAttenSetting, signaling a serious low-side deviation in the relative attenuation pad applied inside the module to trim the RF or optical signal level. An admin sets this as the floor beyond which the reading is considered a significant fault rather than normal variation.