This read-only counter, in cells, tracks the number of valid EOF=1 ATM cells in the ingress direction of this channel that are discarded at the traffic management entity. An admin cares because losing an end-of-frame cell can corrupt an entire AAL5 frame even if the rest of its cells were delivered, so this counter is a useful indicator of frame-level, not just cell-level, impact from policing or congestion. For example, if application-layer errors correlate with a rising count here, the admin would suspect that traffic management discarding frame-ending cells is causing whole frames to be corrupted rather than isolated cell loss.