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