L22 - Ring networks The token ring is an original 802...

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Ring networks The token ring is an original 802 standard, but mostly obsolete as a local network. Still the concept and features of a ring of stations are of some importance. The main types of rings are the token ring and the slotted ring.
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Token ring A token circulates when the ring is idle. A station wishing to transmit seizes a token and replaces it by a packet (of variable length). The station that seized a token will replace it after its packet transmission.
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A packet of data circulates entirely around the ring and is removed by the sender. The token ring does not encounter collisions. the stations are active rather than passive - they can alter the signal going around the ring. Usually only a one-bit delay per station is needed to do this.
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Token replacement Two approaches: a) Immediate token release. b) Release after packet return.
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Error control on the token ring . Ultimate error control is not normally carried out on the token ring. At the link error control level, ARQ
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L22 - Ring networks The token ring is an original 802...

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