This read-only Counter32, in bytes, tracks the number of bytes discarded in the ingress direction by the channel because the DE threshold was exceeded. An administrator uses it as the inbound counterpart to xmtBytesDEDiscard, isolating DE-related discards to this specific channel rather than the whole port. For example, if a customer reports lost data on a single PVC, an engineer would check this channel-specific counter to see if DE-threshold discards on that connection are the cause.