The Free On-line Dictionary of Computing (30 December 2018):

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)