I googled and got:
http://www.google.com/search?hl=en&q=internet+backbone&btnG=Google+Search
then I chose:
http://www.cnet.com/Resources/Info/G...tbackbone.html
and this is where I ended:
Internet backbone This superfast network spanning the world from one major metropolitan area to another is provided by a handful of national Internet service providers (ISPs). These organizations (including Net 99 and Alternet) use connections running at approximately 45 mbps (T3 lines) linked up at specified interconnection points called national access points (which are located in major metropolitan areas). Local ISPs connect to this backbone through routers so that data can be carried though the backbone to its destination.
Grim
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Posting Maven
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since Feb 2004