100BaseVG was originally proposed by Hewlett-Packard, ratified by the ISO in 1995 and was practically extinct by 1998.
100BaseVG started in the IEEE 802.3 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 first faction argued that, since IEEE 802.3 was the Ethernet committee, it wasn't the place to develop a different protocol. Thus, the IEEE 802.12 committee was thus formed and standardized 100BaseVG?.
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