This read-only Counter32, in bytes, tracks the number of bytes discarded in the egress direction by the channel because the DE (Discard Eligible) threshold was exceeded. An administrator uses it as a per-channel view of DE-driven discards, more granular than the port-level DE discard counters found in other MIBs. For example, an engineer investigating a single misbehaving PVC on an otherwise healthy port would check this channel-level counter to isolate the discards to that specific connection.