This read-only counter tracks the number of Ethernet frames on the interface that were aborted and never successfully transmitted because they hit an excessive number of collisions. An admin treats a nonzero or rising count here as a clear sign of packet loss due to segment congestion, distinct from the collision counters that track frames eventually transmitted. A rising statIflanEthExcessiveCollision count would lead an admin to investigate for a duplex mismatch, a faulty cable, or an overloaded shared hub.