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