Accessing of transmission channels of a communication system

Abstract From the Canadian patent

In a communications system with a plurality of subscriber stations independent from each other where each, subscriber station can access according to a multiple access method a joint duplex transmission channel the probability, becomes very large for simultaneous attempts to get access and thereby the probability of signal destruction becomes particularly large. In order to avoid a blockage of the service channel each subscriber station occupies the duplex transmission channel with a short access signal for initiating a transmission starting with the subscriber station. The subscriber station characterized by the position in time and/or the information contents of the signalling short …