This counter reports the packets successfully transmitted out of this specific transmit queue. It applies to a transmit queue on a subscriber circuit's session where QoS queuing is enabled. Admins track it per queue to see how traffic is actually being scheduled and, for the dropped variants, where congestion is forcing discards on this subscriber circuit. Discontinuities in the value can occur when the management system re-initializes, so a sudden reset does not necessarily mean the underlying activity stopped.