The fault tolerant method for detecting {HEAD ~ a sync mark} 32, wherein the state machine is {TAIL ~ a counter} 
The fault tolerant method for detecting { HEAD ~ a sync mark } 32 , wherein the state machine is { TAIL ~ a counter }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL