The Token Ring

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The Token Ring:

The IEEE standard for Token Ring is IEEE 802.5. Token Ring was created by IBM for the forwarding of data on a logical unidirectional ring. Token Ring, like Ethernet, is a LAN technology that supports shared media access to several connected hosts and is applied in the Data-Link Layer. Token Ring networks transmit a small frame, called a token, to the hosts on the network. A host that holds the token has the right to transmit a frame onto the ring. After a station has the token, it adjusts it into a data frame, attaches the data for transmission, and forwards the frame to the next station. A ring will not contain a token until the data frame is received by the source station and tagged as read and copied whereupon the token is returned back into the ring. One station at a time can transmit a token to avert collisions on the Token Ring network.

A Token Ring network has a bandwidth of 4 Mbps or 16 Mbps. At the higher end, hosts are allowed to present a new token once transmission of a frame is completed. This expedient token release boosts efficiency by allowing more than one host transmit a frame during the original token’s round trip. One station is responsible for acting as a ring monitor to offer  recovery from runaway frames or tokens. The ring monitor will remove frames that have circled the ring once, if no other station removes them.

Traditional Token Ring networks use…

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