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Glossary of Data Communications Terms
Courtesy Enterprise-Wide Computing, Inc.
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Term:
token ring
Definition:
A local area network formed in a ring (closed loop)
topology that uses token passing as a means of regulating
traffic on the line. On a token ring network, a token
governing the right to transmit is passed from one station
to the next in a physical circle. If a station has
information to transmit, it 'seizes' the token, marks it as
being in use, and inserts the information. The 'busy'
token, plus message, is then passed around the circle,
copied when it arrives at its destination, and eventually
returned to the sender. The sender removes the attached
message and then passes the freed token to the next station
in line. Token ring networks are defined in the IEEE 802.5
standards. See also IEEE 802 standards, ring network, token
passing, IBM Token Ring. Compare token bus network.
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