{HEAD ~ A calling station} breaks {TAIL ~ the silence} of 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 
{ HEAD ~ A calling station } breaks { TAIL ~ the silence } of 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
HEAD 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 OTH OTH OTH