This notification-only integer, carried as a variable binding in swDdmAlarmTrap and swDdmWarningTrap, tells the receiving NMS whether the threshold that was exceeded was a high(1) or low(2) threshold. An admin reading a trap uses this field to know immediately whether a port's optic ran too hot/bright or too cold/dim without cross-referencing the configured threshold tables. For example, a trap carrying swDdmThresholdExceedType=low(2) alongside a rxPower threshold type means the port's receive power fell below its low alarm.