This read-only Counter is the running total of all frames received on this port since the last counter reset, the broadest inbound traffic measure available per port. It's the baseline against which more specific error and category counters on this port, like ciscoTsPortStatsLongFrames or ciscoTsPortStatsPktsInErrors, are meaningfully compared as a ratio or percentage rather than raw counts. A port showing 2 million total InFrames with only 50 error frames is healthy, while the same 50 errors against 500 total frames would be alarming.