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backbone site
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backbone site /n./  A key Usenet and email site; one that
   processes a large amount of third-party traffic, especially if it
   is the home site of any of the regional coordinators for the Usenet
   maps.  Notable backbone sites as of early 1993, when this sense of
   the term was beginning to pass out of general use due to wide
   availability of cheap Internet connections, included uunet and
   the mail machines at Rutgers University, UC Berkeley, DEC's
   Western Research Laboratories, Ohio State University, and the
   University of Texas.  Compare rib site, leaf site.
   [1996 update: This term is seldom heard any more.  The UUCP network
   world that gave it meaning has nearly disappeared; everyone is on
   the Internet now and network traffic is distributed in very
   different patterns. --ESR]
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