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