This Counter32 counts, in cells, CLP=0 cells in the ingress direction of this channel that were discarded either by the traffic policing entity for violating UPC parameters or at the class-of-service queue due to overflow. Because it lumps both policing and queue-overflow causes into one number for the connection's highest-priority traffic, any nonzero value is significant and warrants checking both the policing configuration and queue depth. An admin seeing voice quality complaints on this PVC would check this counter first since it covers loss of the connection's protected traffic.