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