This Integer32 gives the finalized count of times the ComPort's voice port dropped cells due to a full queue during the previous 15-minute period. Because it's a completed window, this counter is what a support ticket history would reference to show whether voice-cell drops have been a recurring problem on this subscriber's line. For example, a pattern of nonzero stuVoiceChanStatsPrevDrpdCellCnt values recurring at the same time of day across many previous periods would point to a capacity issue during peak hours.