Wednesday, November 14, 2012
Token Passing Network
In token passing system, all stations are logically connected in the form of a ring and Manage of the admission to the medium is performed using a token. A token is an individual bit Guide or a tiny packet, more often than not several bits in length, which flow from node next node. Token passing can be used with both broadcast (token bus) and in order Connected (token ring) type of networks with some difference in the details as considered.
In case of token ring, token is passed data packets from a node to the physically neighboring node. On the other hand, in the token bus, token is passed with the assist of the MAC address of the computer which logical design in a ring. In either case a node currently holding the token has the’ right to transmit’. When it has got data to send, it removes the token and transmits the Data and then forwards the token to the next logical or physical computer tokens in the ring. If a node Currently holding the token has no data to send, it simply forwards the token to the next. The token passing scheme is resourceful compare to the polling technique, but it Realize on the correct and reliable operation of all the nodes. There exists a number of
Potential problems, such as lost token, duplicate token, and insertion of a node, removal Of a node, this must be tackled for correct and reliable operation of this scheme.
Posted by Sanjaya Alwis at 3:15 PM
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