AT&T, Verizon, tw Telecom, Cox, XO, Qwest, Time Warner Cable and Level 3 (in rank order) comprise Vertical Systems Group's year-end 2010 US Business Ethernet Leaderboard.
Latest research on enterprise network installations also showed higher than expected market growth as enterprises were more confident about purchasing Layer 2 Ethernet services for their ultra-high bandwidth applications.
Vertical said the top tier of the US Leaderboard solidified during the past year, with AT&T, Verizon and tw Telecom accounting for half of the US retail Ethernet port base.