A descriptor based system is used for scheduling the timely output of transport packets wherein each descriptor records a dispatch time as well as {HEAD ~ a receipt time} for {TAIL ~ each transport packet} 
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A descriptor based system is used for scheduling the timely output of transport packets wherein each descriptor records a dispatch time as well as { HEAD ~ a receipt time } for { TAIL ~ each transport packet }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL