This read-only Counter64 reports the receive byte rate for this PM instance, sampled per second rather than accumulated over the whole bin. Because it is a rate rather than a running total, it is the field an admin actually watches on a live dashboard to catch a bandwidth spike the moment it happens, without waiting for the bin to close; 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 105 (E-Line, 100 Mbps CIR/1 Gbps EIR), a live reading of 200,511,829 bytes/sec against a 1,000,000,000-bps port tells an admin roughly how close to full the link is running right now.