100BaseVG
<networking> 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)
Nearby terms:
100BaseFX « 100BaseT « 100BaseTX « 100BaseVG
» 100VG-AnyLAN » 10base2 » 10base5
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