Within the IS 54 standard, which describes the interface between {HEAD ~ mobile and base equipment} for {TAIL ~ North American digital cellular systems}, each information time slot is preceded by a known sequence, designated as the preamble 
for
Within the IS 54 standard , which describes the interface between { HEAD ~ mobile and base equipment } for { TAIL ~ North American digital cellular systems } , each information time slot is preceded by a known sequence , designated as the preamble
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH