This Counter64 tallies the total octets transmitted out through the circuit, the byte-level egress counterpart to circuitOutFrames, useful for deriving actual outbound throughput in the same way circuitInOctets is used for the ingress side. An admin compares this against circuitInOctets to detect byte-level loss within the circuit's own path, and trends it over time to monitor whether outbound throughput on this circuit is approaching its provisioned rate. For example, sustained circuitOutOctets growth that tracks close to the circuit's committed rate (from circuitFwdTDParam1) confirms the circuit is being fully utilized rather than underused.