means for generating {TAIL ~ a synchronizing signal part} having at least a predetermined first number of bits of {HEAD ~ a first binary level} 
means for generating { TAIL ~ a synchronizing signal part } having at least a predetermined first number of bits of { HEAD ~ a first binary level }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD