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