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.
