Storage and Switching Circuits for an Electronic Telephone System

Sonic wire delay lines are used for the storage functions and transistor switching circuits for the logic functions comprising the common control of this electronic telephone switching system. Because only short-term storage of transient information (identity of the two parties during a telephone conversation) is required, sonic delay lines are uniquely suitable as storage elements. The use of modern high-speed transistors results in simple and reliable saturated-mode switching circuits operating at a clock frequency of 1 Mc/s.