This read-only Counter64 reports the receive frame rate for this PM instance, sampled per second. A high frames-per-second reading paired with a low bytes-per-second reading points to a flood of small frames — common in a control-plane storm or a DoS-style event — which the byte-rate counter alone would mask; 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 105 (E-Line, 100 Mbps CIR/1 Gbps EIR), a live reading of 369,067 frames/sec spiking well above baseline is what would prompt an admin to check for a broadcast or small-packet flood in real time.