 The GTD-5 EAX first appeared in Banning, California on June 26, 1982, slowly replacing the electromechanical systems still in use in the independent switch market at that time.The GTD-5 EAX was also used as a Class 4 telephone switch or as a mixed Class 4/5 in markets too small for a GTD-3 EAX or 4ESS switch.The GTD-5 EAX was also exported internationally, and manufactured outside of the U.S. under license, primarily in Canada, Belgium and Italy.