This enumerated value sets whether a statistical alarm raised when any Line-layer threshold is exceeded is reported as minor or major severity. An admin cares because this controls how prominently a Line-layer error-rate excursion surfaces in the alarm console, and setting it appropriately for the circuit's importance (major for a critical trunk, minor for a less critical one) shapes how quickly staff respond. For example, an admin managing a backbone trunk line would set this to major so any Line-layer threshold breach gets escalated rather than buried among routine minor alarms.