Technical Definitions: What is 100BaseVG? 100BaseVG Definition.

Free Definitions: Networking: General

100BaseVG Definition

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.


- The Free On-line Dictionary of Computing, http://www.foldoc.org/, Editor Denis Howe

Definition Provided By Denis Howe