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- 4ESS_switch abstract "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. 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.".
- 4ESS_switch thumbnail 4ESS_Switch_Emergency_Action_Interface_(EAI)_Display_Page.png?width=300.
- 4ESS_switch wikiPageExternalLink attcrash.htm.
- 4ESS_switch wikiPageExternalLink bstj-vol56-issue07.html.
- 4ESS_switch wikiPageExternalLink weess.htm.
- 4ESS_switch wikiPageExternalLink watch?v=jdT5hd_0p_8.
- 4ESS_switch wikiPageID "9937792".
- 4ESS_switch wikiPageLength "6357".
- 4ESS_switch wikiPageOutDegree "36".
- 4ESS_switch wikiPageRevisionID "649885696".
- 4ESS_switch wikiPageWikiLink 1ESS_switch.
- 4ESS_switch wikiPageWikiLink 3B_series_computers.
- 4ESS_switch wikiPageWikiLink 5ESS_switch.
- 4ESS_switch wikiPageWikiLink AT&T_Corporation.
- 4ESS_switch wikiPageWikiLink Advanced_Telecommunications_Computing_Architecture.
- 4ESS_switch wikiPageWikiLink Alcatel-Lucent.
- 4ESS_switch wikiPageWikiLink Atlanta.
- 4ESS_switch wikiPageWikiLink Bell_Labs_Technical_Journal.
- 4ESS_switch wikiPageWikiLink Bell_System_Practices.
- 4ESS_switch wikiPageWikiLink Breakup_of_the_Bell_System.
- 4ESS_switch wikiPageWikiLink Category:Telephone_exchange_equipment.
- 4ESS_switch wikiPageWikiLink Central_processing_unit.
- 4ESS_switch wikiPageWikiLink Chicago.
- 4ESS_switch wikiPageWikiLink Class-4_telephone_switch.
- 4ESS_switch wikiPageWikiLink Common-channel_signaling.
- 4ESS_switch wikiPageWikiLink Common-network_interface_ring.
- 4ESS_switch wikiPageWikiLink Crossbar_switch.
- 4ESS_switch wikiPageWikiLink Disk_storage.
- 4ESS_switch wikiPageWikiLink Electronic_switching_system.
- 4ESS_switch wikiPageWikiLink File:4ESS_Switch_Emergency_Action_Interface_(EAI)_Display_Page.png.
- 4ESS_switch wikiPageWikiLink Henry_Earle_Vaughan.
- 4ESS_switch wikiPageWikiLink Lisle,_Illinois.
- 4ESS_switch wikiPageWikiLink Multi-Environment_Real-Time.
- 4ESS_switch wikiPageWikiLink Naperville,_Illinois.
- 4ESS_switch wikiPageWikiLink Oklahoma_City.
- 4ESS_switch wikiPageWikiLink Regional_Bell_Operating_Company.
- 4ESS_switch wikiPageWikiLink SBC_Long_Distance.
- 4ESS_switch wikiPageWikiLink Telephone_exchange.
- 4ESS_switch wikiPageWikiLink Time-slot_interchange.
- 4ESS_switch wikiPageWikiLink Western_Electric.
- 4ESS_switch wikiPageWikiLink YouTube.
- 4ESS_switch wikiPageWikiLinkText "#4 TOLL".
- 4ESS_switch wikiPageWikiLinkText "#4ESS".
- 4ESS_switch wikiPageWikiLinkText "4ESS switch".
- 4ESS_switch wikiPageWikiLinkText "4ESS".
- 4ESS_switch wikiPageWikiLinkText "No. 4 Electronic Switching System (ESS)".
- 4ESS_switch wikiPageWikiLinkText "No. 4 Electronic Switching System".
- 4ESS_switch wikiPageUsesTemplate Template:More_footnotes.
- 4ESS_switch wikiPageUsesTemplate Template:Reflist.
- 4ESS_switch wikiPageUsesTemplate Template:Telephone_Switches.
- 4ESS_switch subject Category:Telephone_exchange_equipment.
- 4ESS_switch hypernym Class.
- 4ESS_switch type Exchange.
- 4ESS_switch type Redirect.
- 4ESS_switch comment "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. 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.".
- 4ESS_switch label "4ESS switch".
- 4ESS_switch sameAs Q4638898.
- 4ESS_switch sameAs m.02pxky4.
- 4ESS_switch sameAs Q4638898.
- 4ESS_switch wasDerivedFrom 4ESS_switch?oldid=649885696.
- 4ESS_switch depiction 4ESS_Switch_Emergency_Action_Interface_(EAI)_Display_Page.png.
- 4ESS_switch isPrimaryTopicOf 4ESS_switch.