Token (computer network)

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A token ( . English for signs , brand ) is a tool for synchronizing parallel processes - who has the token, not (for example, a storage area or an interface) to access the resource. When he has released the token, a competitor can use the resource.

Token in computer networks

It is used in a computer network to prevent collisions when accessing data frames and to ensure that all connected computers have the opportunity to send.

The token is used in the media access procedure token-passing to switch between the competing processes. Network architectures that use this method are e.g. B. Token Bus and Token Ring .

Object access control via token

If a process needs exclusive access to an object (e.g. to a database table or a memory area), this can be modeled using a token. The different methods are called mutex .


  • Manfred Burke: Computer Networks. Concepts and techniques of data transmission in computer networks, BG Teubner Verlag, Stuttgart 1994, ISBN 978-3-519-02141-4 .
  • Martin Zieher: Coupling of computer networks. Springer Verlag, Berlin / Heidelberg 1989, ISBN 978-3-540-51873-0 .
  • Bernd Lindemann: Local computer networks. VDI Verlag, Düsseldorf 1991, ISBN 978-3-642-95829-8 .
  • Eduard Gabele, Michael Kroll, Wolfgang Kreft: Communication in computer networks. Springer Verlag, Berlin / Heidelberg 1991, ISBN 978-3-540-54561-3 .
  • Stefan Pappe: Database access in open computer networks. Springer Verlag, Berlin / Heidelberg 1991, ISBN 978-3-540-53232-3 .

See also

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