This read-only Counter64 counts frames — not bytes — received on this PM instance that the switch accepted. Pairing it with the accepted-bytes counter on the same instance lets an admin derive the average accepted frame size, which flags whether the link is carrying many small control/voice frames or fewer large bulk-data frames; 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 a 10 Gbps aggregation trunk carrying multiple EVCs, this might read 2,830,000 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.