This read-only Counter64 records the total number of packets transmitted on this port during this bin's period, per its description, the outbound counterpart to cienaCesPmExtendedTxRxHistoryBinRxPkts. Dividing this bin's TxBytes by this packet count gives the average transmitted frame size for that specific window, letting an engineer see whether outbound traffic during a given period trended toward small control-heavy frames or large bulk-transfer frames. An engineer diagnosing unexpectedly high outbound packet-processing load, despite modest total byte volume, would check this count against TxBytes for the same bin to confirm a large number of small frames, not raw volume, is driving the load.