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 lifetime bin, which keeps accumulating until an operator explicitly clears it, a sudden plateau on an otherwise busy instance is itself a signal — most likely that someone cleared the stats rather than that traffic actually stopped. On EVC 105 (E-Line, 100 Mbps CIR/1 Gbps EIR), a live reading of 7,474 frames/sec spiking well above baseline is what would prompt an admin to check for a broadcast or small-packet flood in real time.