This read-only Counter64 reports the transmit byte rate for this PM instance, sampled per second. Admins compare this to the port's provisioned egress bandwidth in real time to see whether a service is currently saturating its allocation, well before a daily or 24-hour total would reveal it; because it is drawn from this table's currently-accumulating, short-interval bin, it reflects only the last few minutes of activity, so it's the value to watch for a fast-forming problem rather than a long-term trend. On a 100 Mbps residential broadband EFP, a live reading of 70,790,492 bytes/sec against a 100,000,000-bps port tells an admin roughly how close to full the link is running right now.