A read-only MacAddress identifying the specific subscriber unit that either failed to transmit the minimum number of codewords in an operational hour or whose percentage of errored codewords exceeded the configured threshold. This gives the head end a direct, automatically-populated pointer to exactly which remote unit is causing a problem, without an admin having to poll every subscriber unit individually to find it. For example, after receiving a p2mpHeChPctErrCWThreshTrap, an admin would read p2mpBadSuMacAddress to immediately identify which specific subscriber unit on the network triggered the alarm.