A method of sharing duplex channels in an automatic channel selection system and an automatic channel selection system in which this method is applied

摘要

A method of sharing a predetermined number of duplex channels in a frequency band in an automatic channel selection system, the stations comprised in this system continuously scanning in a resting condition all the receiving channels in the duplex band assigned to them, each searching for its own address code. During the signalling phase for setting up a connection between a first (calling) station and a second (called) station a listening slot for the called station is provided in which slot this station listens to any signals from other stations than the calling station coming in via the relevant duplex channel, after which a negative verification signal is transmitted if such signals are received as a result of which no connection is effected via the relevant channel between the calling and the called station.