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4ESS switch
The 4ESS switch is a Class 4 telephone electronic switching system that was the first digital electronic toll switch introduced by Western Electric for long-distance switching. It was introduced January, 1976 in Chicago, Illinois to replace the 4a crossbar switch. 〔(Bell System Technical Journal, v56: i7 September 1977, No. 4 ESS: Prologue,Spencer, A.E. Jr. )〕
The last of 145 in the AT&T network was installed in 1999 in Atlanta. Approximately half of the switches were manufactured in Lisle, Illinois, and the other half were manufactured in Oklahoma City, Oklahoma. At divestiture, most of the 4ESS switches became assets of AT&T as part of the long-distance network while others remained in the RBOC networks. Almost 150 4ESS switches remained in service in the United States in 2007.
==System architecture/organization==
The 4ESS has three major components: the processor, the file store (later known as the attached processor system, 4EAPS), and the peripheral units.
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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