A calling station breaks {HEAD ~ the silence} of {TAIL ~ the network} by transmitting a call sequence . . . ST, ST, ST, ST, ST, . . . , under frequency conditions which are determined from its standby law Li in progress and from the preceding standby law Li 1 
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A calling station breaks { HEAD ~ the silence } of { TAIL ~ the network } by transmitting a call sequence . . . ST , ST , ST , ST , ST , . . . , under frequency conditions which are determined from its standby law Li in progress and from the preceding standby law Li 1
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH