cmNetPortPrioMapCOS is a read-write integer (0-7) specifying the Class-of-Service value that a given incoming priority is mapped to on this network port, which in turn determines the appropriate COS policer applied to that flow's traffic. An administrator tunes this mapping to control which policing/queuing treatment traffic of a given priority receives as it crosses this port. For example, mapping incoming priority 5 (typically voice-signaling-class traffic) to a higher CoS value would ensure it is policed less aggressively than best-effort traffic on the same network port.