This Counter64 tallies the total number of test packets the generator has transmitted for this test instance, forming the baseline against which every receive-side counter (RxPkts, duplicates, OOO, etc.) in the same table is compared. An admin needs this specific number, rather than an assumed target rate times duration, because actual transmitted count can differ from the configured target if the generator itself throttles under load. For example, dividing (TxPkts - RxPkts) by TxPkts gives the admin the actual measured frame-loss ratio for the test instance, independent of the device's own reported KPI pass/fail result.