This counts the total number of valid packets transmitted over this specific pseudowire service instance. Comparing TxPkt on this PW against the remote end's RxPkt (where visible) is how an admin estimates one-way packet loss across the network path carrying this specific service -- and this specific object covers a closed 24-hour history bin -- a final, day-over-day comparable count rather than a live figure. For example, over that completed 24-hour bin, this pseudowire might show this counter at 9000000 -- a concrete count the admin can trend against neighboring bins to judge whether the condition it reflects is worsening.