Author_Institution :
Bell Telephone Laboratories, Inc., New York, N. Y.
Abstract :
THE RAPID mechanization of the local telephone plant throughout the Bell System, together with the continuous expansion of subscriber dialing areas, has made necessary the development of an automatic tandem system having many new features not available in former tandem systems. This new system is known as crossbar tandem and is based on the crossbar system introduced in the late 1930´s.
