This Counter32 holds the upper 32 bits of the 64-bit count of cells that arrived at this queue during a particular 15-minute interval, paired with cwacIntCellArrivals or the combined cwacHCIntCellArrivals. It exists to give a full-precision arrival count for very high-traffic queues where a 32-bit counter alone could wrap within the interval. An admin monitoring a core-facing queue with extremely high cell rates would rely on this high-order word (or the combined 64-bit value) to avoid misreading a wrapped counter as low traffic.