Abstract: In order to establish communications in a conference network of transmitter-receiver stations, each station establishes a frequency-jumping standby law while a calling station transmits a frequency-diversity call sequence on said standby law and the other stations are listening in accordance with said standby law. Furthermore, each station establishes a second frequency law which is synchronous with the standby law but the stair-steps of which are of longer duration. At the end of a call sequence, the calling station and the stations which have detected this sequence are put in the listening state over a time interval t.sub.1 at the corresponding possible traffic frequency of the second frequency law. Each station which has detected a signal then transmits a jamming signal over a time interval t.sub.2 at the aforementioned traffic frequency and the stations which have not detected any signal extend the listening period by the same time interval t.sub.2. Non-reception of a signal during the time interval t.

Abstract: The method of synchronization enables a network of transmitter-receiver stations which communicate by frequency-jumping to establish communication links after silent periods of long duration in spite of drift of the clocks with which the transmitter-recivers of the network are equipped. Standby laws L.sub.i having frequency jumps deduced from the traffic law L are applied during the silent periods of the network. These laws progress at a frequency which is lower as the silent period of the network becomes longer. A calling station breaks 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 L.sub.i in progress and from the preceding standby law L.sub.i-1. The stations in the standby state detect in this sequence part of the sequence which coincides with their own standby law and accordingly deduce their relative displacement with respect to the calling station.