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2 - Link-level Protocols

Published online by Cambridge University Press:  22 March 2010

Anneke A. Schoone
Affiliation:
Universiteit Utrecht, The Netherlands
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Summary

In this chapter we consider some link-level protocols and show their partial correctness by assertional verification. Link-level protocols, i.e., protocols residing in the data link layer, are designed to control the exchange of information between two computing stations, e.g. computers or processors over a full-duplex link. They should guard against the loss of information when the transmission medium is unreliable. We only discuss transmission errors that occur while the link is up, and thus use the model of a static network consisting of two nodes i and j, and a bidirectional link (i, j). We will not deal with the problems caused by links or nodes going down, nor with the termination of a protocol. In a different context, these issues will be dealt with in later chapters.

In section 2.1 we discuss a generalization of the sliding window protocol. This protocol is meant to control the exchange of messages in an asynchronous environment. Although sliding window protocols belong to the data link layer, we will see in chapter 4 that the generalization can also be used as a basis for connection management, which belongs to the transport layer. We show that the alternating bit protocol and the “balanced” two-way sliding window protocol are instances of this one general protocol skeleton, that contains several further parameters to tune the simultaneous transmission of data over a full-duplex link. After proving the partial correctness of the protocol skeleton, we discuss the dependence of the optimal choice of the parameters on the propagation delay of the link, the transmission speed of the senders, and the error rate of the link.

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Publisher: Cambridge University Press
Print publication year: 1996

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  • Link-level Protocols
  • Anneke A. Schoone, Universiteit Utrecht, The Netherlands
  • Book: Protocols by Invariants
  • Online publication: 22 March 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511663123.003
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  • Link-level Protocols
  • Anneke A. Schoone, Universiteit Utrecht, The Netherlands
  • Book: Protocols by Invariants
  • Online publication: 22 March 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511663123.003
Available formats
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To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Link-level Protocols
  • Anneke A. Schoone, Universiteit Utrecht, The Netherlands
  • Book: Protocols by Invariants
  • Online publication: 22 March 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511663123.003
Available formats
×