e/4ESS switch

Information
has gloss	eng: 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 in 1976 in Chicago, Illinois to replace the 4a crossbar switch. The last of 145 in the AT&T network was installed in 1999 in Atlanta. Approximately half of the switches were manufactured in Lisle, 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 remain in service in the United States in 2007. It is estimated it may still be in operation until approximately 2015. The 4ESS has 3 major components: the 1A or 1B Processor, the Attached Processor System (4E APS), and the Peripheral Units.
lexicalization	eng: 4ESS Switch
instance of	(noun) a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication central, telephone exchange, exchange