100basevg definition

100basevg





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From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:

  100BaseVG
       
           A 100 {MBps} {Ethernet} standard specified to run
          over four pairs of {category 3} {UTP} wires (known as voice
          grade, hence the "VG").  It is also called 100VG-AnyLAN
          because it was defined to carry both {Ethernet} and {token


          ring} {frame} types.
       
          100BaseVG was originally proposed by {Hewlett-Packard},
          ratified by the {ISO} in 1995 and practically extinct by 1998.
       
          100BaseVG started in the IEEE 802.3u committee as {Fast
          Ethernet}.  One faction wanted to keep {CSMA/CD} in order to
          keep it pure Ethernet, even though the {collision domain}
          problem limited the distances to one tenth that of {10baseT}.
          Another faction wanted to change to a polling architecture
          from the hub (they called it "demand priority") in order to
          maintain the 10baseT distances, and also to make it a
          {deterministic} {protocol}.  The CSMA/CD crowd said, "This is
          802.3 -- the Ethernet committee.  If you guys want to make a
          different protocol, form your own committee".  The IEEE 802.12
          committee was thus formed and standardized 100BaseVG.  The
          rest is history.
       
          (1998-06-30)
       
       

















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