This is the percentage threshold that, when a port's traffic utilization, averaged over a 64-second measurement interval, exceeds it, triggers a utilization alarm for that specific port. An admin tunes this per deployment to catch ports that are chronically overloaded on this multiplexer node; set too low and normal traffic bursts trigger nuisance alarms, set too high and genuine saturation goes unreported until users notice slow response times. For example, setting this threshold to 85% would generate an alarm the moment any port's 64-second average utilization crosses 85% of its clock rate.