The stations in the standby state detect in {TAIL ~ this sequence} {HEAD ~ part} of the sequence which coincides with their own standby law and accordingly deduce their relative displacement with respect to the calling station 
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The stations in the standby state detect in { TAIL ~ this sequence } { HEAD ~ part } of the sequence which coincides with their own standby law and accordingly deduce their relative displacement with respect to the calling station
OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH