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Linux Tutorial - Networking - Network Technologies - Token-Ring
  Ethernet ---- ATM  


Token-ring, developed by IBM, is embodied in the IEEE standard 802.5. The key concept in this type of network is the idea of a token. This is similar to a baton in a relay race when each machine must receive the token before it is allowed to go. If a particular machine has nothing to send, it simply passes the token on to the next machine. If it does have something to send, the message is "linked" with the token before it is send. By seeing the token linked to the message, the other machines know that the token is in use and pass it along to the destination. When the destination machine gets the entire bundle, it puts the token back on the network, with a tag to indicate that it received the packet. It is then passed to the originator as an acknowledgment. The originator then passes the token along to the next machine.

This scheme provides guaranteed access to the network since every machine will eventually get the token. Even if the originator of one packet has more to send, once it gets its acknowledgment back, it must pass the token along. If no others want to send anything, then it can come back to the first machine. However, the others were given the chance to send something. This method also provides reliability since the destination machine sends the packet back with an acknowledgment.

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Copyright 2002-2009 by James Mohr. Licensed under modified GNU Free Documentation License (Portions of this material originally published by Prentice Hall, Pearson Education, Inc). See here for details. All rights reserved.
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