Terminating call connections in a magnetic-drum-controlled electronic telephone exchange

In an electronic telephone exchange shortly to be installed Highgate Wood and using a time-division-multiplex principle, magnetic drum is used to search for semi-permanent information stored on the drum relating to called subscribers´ lines. A temporary store associated with each line is used to determine whether a connection possible, and if so, information relating to the line is passed to other sections of the exchange, so that a connection can be established between the calling and called lines.