To further increase the fault tolerance, the sync mark detector is enabled by timing {TAIL ~ recovery} relative to the end of {HEAD ~ the preamble field} 
To further increase the fault tolerance , the sync mark detector is enabled by timing { TAIL ~ recovery } relative to the end of { HEAD ~ the preamble field }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD