L24 - Ring networks Types of rings Token ring - most...

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Ring networks Types of rings Token ring - most popular Slotted ring Register insertion ring
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As with polling and token bus, rings do not encounter collisions. There is less overhead and delay than with the token bus, because each station is visited in turn as the token circulates around the ring.
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The token ring Unlike the token bus, 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. A token circulates when the ring is idle. A station wishing to transmit can seize a token and replace it by a packet (of variable length). The station that seized a token will replace it after its packet transmission. A packet of data circulates entirely around the ring and is removed by the sender.
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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
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L24 - Ring networks Types of rings Token ring - most...

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