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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
100BaseVG
100VG-AnyLAN
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 standardised 100BaseVG. The
rest is history.
(1998-06-30)