An Experimental Electronically Controlled Automatic Switching System

An automatic telephone switching system, built as a laboratory experiment, is described in which electronic techniques, high speed relays and a subscriber telephone with a preset dialing mechanism were employed. One-at-a-time operation within the office was made possible by these fast tools; that is, only a single control circuit was provided for each function. This experimental system, although not commercially economical, showed that an advantageous reduction in the number of control and connector circuits is made possible by this method of operation.