This counter reports the total frames of ingress traffic on this PM instance that exceeded even the excess rate and were outright discarded, during a completed 15-minute window (for example 14:30-14:45). Any nonzero value accumulated over that completed 15-minute interval represents traffic this specific service actually lost at ingress due to rate policing, which is a direct, quantifiable cause for a customer's throughput or application-quality complaint on this port, distinct from congestion elsewhere in the network. For example, a frame-drop count that climbs in lockstep with the byte-drop count (rather than being disproportionately higher) within that completed 15-minute interval tells you the discarded traffic was mostly full-size frames, consistent with a bulk transfer rather than a flood of small packets.