When {HEAD ~ an unwanted pulse X} is produced in {TAIL ~ the first packet synchronizing signal a}, the first packet synchronizing signal a and the second packet synchronizing signal e do not agree with each other 
is produced in
When { HEAD ~ an unwanted pulse X } is produced in { TAIL ~ the first packet synchronizing signal a } , the first packet synchronizing signal a and the second packet synchronizing signal e do not agree with each other
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH