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Glossary of Data Communications Terms
Courtesy Enterprise-Wide Computing, Inc.
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Term:
IEEE 802 Standards
Definition:
A set of standards developed by the IEEE to define methods
of access and control on local area networks. The IEEE 802
standards correspond to the physical and data-link layers
of the ISO Open Systems Interconnection model, but they
divide the data-link layer into two sublayers. The logical
link control (LLC) sublayer applies to all IEEE 802
standards and covers station-to-station connections,
generation of message frames, and error control. The media
access control (MAC) sublayer, dealing with network access
and collision detection, differs from one IEEE 802 standard
to another: IEEE 802.3 is used for bus networks that use
CSMA/CD, both broadband and baseband, and the baseband
version is based on the Ethernet standard. IEEE 802.4 is
used for bus networks that use token passing, and IEEE
802.5 is used for ring networks that use token passing
(token ring networks). In addition, IEEE 802.6 is an
emerging standard for metropolitan area networks, which
transmit data, voice, and video over distances of more than
five kilometers. See also bus network, ISO/OSI model, ring
network, token passing, token ring network.
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