This read-only Counter64 is the frame-level counterpart of the Forwarded-bytes counter — frames successfully sent out on this PM instance. A frame-count jump with flat byte growth usually means the average frame size collapsed — for example a burst of small control packets — which this pairing exposes even when total throughput looks unremarkable; because it is drawn from the grand-total statistics bin for this PM instance, it aggregates across the whole PM instance rather than any single rotating window, so it's the number to cite for a service's overall lifetime performance rather than its behavior in one interval. On EVC 212 (E-LAN) on a metro access ring, this might read 22,800,000 frames over the current statistics window, which an admin would cross-check against the matching byte counter to see if average frame size looks normal for that service.