A plurality of data blocks is received over a transmission time interval and {HEAD ~ the count} of data blocks is stored in {TAIL ~ memory} 
A plurality of data blocks is received over a transmission time interval and { HEAD ~ the count } of data blocks is stored in { TAIL ~ memory }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL