This value sets the threshold at which the station generates a MAC Condition report for an unacceptable rate of not-copied frames, serving as an early warning for buffer congestion on this MAC. An administrator tunes this value to control sensitivity: a low threshold triggers alerts sooner but risks noise, while a high threshold delays alerting until congestion is more severe. For example, lowering this threshold on a MAC known to serve latency-sensitive traffic gives the admin earlier warning before buffer congestion becomes noticeable to applications.