This read-only Counter64 counts the bytes this PM instance successfully forwarded out on egress. Admins trend this against the interface's provisioned bandwidth to see how close the service is running to its ceiling, since forwarded bytes — not accepted bytes — reflect what actually left the box; because it is drawn from this instance's running statistics bin, it behaves like a long-running total rather than a rotating window, so admins baseline against it instead of expecting it to reset daily. On EVC 212 (E-LAN) on a metro access ring, this might read 440,000,000 bytes over the current statistics window — a number an admin would divide by the bin length to sanity-check it against the port's 1,000,000,000-bps ceiling.