What does ET1S stand for?

MLA style: "ET1S." Acronym Finder . 2013. AcronymFinder.com 18 May. 2013 http://www.acronymfinder.com/Extension-Tier-1-Segment-(ET1S).html
Chicago style: Acronym Finder . S.v. "ET1S." Retrieved May 18 2013 from http://www.acronymfinder.com/Extension-Tier-1-Segment-(ET1S).html
APA style: ET1S. (n.d.) Acronym Finder. (2013). Retrieved May 18 2013 from http://www.acronymfinder.com/Extension-Tier-1-Segment-(ET1S).html

Extension Tier 1 Segment

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