This read-only Counter64 is the frame-level counterpart of the Dropped-bytes counter — frames received on this PM instance that were discarded. Dividing this by the accepted-frames counter on the same instance gives the frame loss ratio for that flow point, which is what actually predicts retransmissions or visible quality drops for whatever traffic rides it; because it is drawn from the grand-total statistics bin for this PM instance, it aggregates across the whole PM instance rather than any single rotating window, so it's the number to cite for a service's overall lifetime performance rather than its behavior in one interval. On a 10 Gbps aggregation trunk carrying multiple EVCs, this might read 6,360,000 frames over the current statistics window, which an admin would cross-check against the matching byte counter to see if average frame size looks normal for that service.