This Counter64 tallies octets received at ingress and passed onto the circuit that carry the DE (Discard Eligible) bit, the byte-level counterpart to circuitInDEFrames. Because DE-marked traffic is already flagged as exceeding contract somewhere upstream, tracking the octet volume here (rather than just frame count) tells an admin how much actual bandwidth, not just how many packets, is riding in this at-risk category. For example, a large jump in this counter without a corresponding jump in circuitInDEFrames would suggest the DE-marked traffic consists of unusually large frames, worth investigating for what application is generating it.