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GTD-5 EAX
The GTD-5 EAX (General Telephone Digital Number 5 Electronic Automatic Exchange) is the Class 5 telephone switch developed by GTE Automatic Electric Laboratories. This digital central office telephone circuit switching system is used in the former GTE service areas and by many smaller telecommunications service providers.
==History==
The GTD-5 EAX first appeared in Banning, California on June 26, 1982,〔"100 Years of Telephone Switching",Robert J. Chapuis, A. E. Joel, Jr., Amos E. Joel,p. 392〕 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. By 1988, it had 4% of the worldwide switching market, with an installed base of 11,000,000 subscriber lines.〔Electronic Materials Handbook, Merrill L. Minges, ASM International Handbook Committee, pg. 384, table 1.〕
GTE Automatic Electric Laboratories became GTE Network Systems and later GTE Communication Systems. In 1989, GTE sold partial ownership of its switching division to AT&T, forming AG Communication Systems. AG Communication Systems eventually fell under the ownership of Lucent Technologies, and was dissolved as a separate corporate entity in 2003.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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