This read-only counter, in cells, tracks the number of valid, UPC/PCR-compliant EFCI=0 cells in the ingress direction of this channel that were nonetheless discarded at the class-of-service queue. An admin cares because these are cells that were not marked as congested and complied with rate policing, yet still had to be dropped locally, indicating genuine local queue congestion on this switch. For example, a rising count here alongside a rising cwacsIngEFCI1Discard count would tell the admin that local CoS queue congestion is severe enough to be dropping traffic regardless of its upstream congestion marking.