"Free on-line dictionary of computing" - читать интересную книгу автора (Howe D.) number of each item is zero or one.
(1995-03-13) 100BaseFX (1998-03-23) 100BaseT {CSMA/CD} standards for {twisted pair} cables, including: 100BaseTx (100 Mbps over two-pair {Cat5} or better cable), 100BaseT4 (100 Mbps over four-pair {Cat3} or better cable), 100BaseT2 (in committee; 100 Mbps over two-pair Cat3 or better cable). All are standards (or planned standards) under {IEEE} {802.3}. (1997-01-07) 100BaseTX (1998-06-30) 100BaseVG 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 |
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