Chapter 13 Wide area internetworking

  • P. L. Higginson
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 184)


There will always be requirements to link dissimilar networks and the local-area to wide-area connection is just a particular case of this. Many of the reasons for networks adopting different procedures are technical, for example due to the higher speed and lower cost of local networks, but some are historical, and are a consequence of the investment needed to establish a network. As a result, protocol translation services are required.

For future networks, the standardisation by ISO of Transport Layer protocols will provide easier ways to link networks and hopefully a solution to the addressing problems of local networks. It will be some time before the equivalent standardisation of higher level protocols will remove the need for functional mapping of higher level protocols.

At UCL we have successfully linked our local network and its services to two different external protocol systems (and hence three wide-area networks) using a common interface for call level protocols which is similar in function to the ISO Transport Service. We have used Relays to map all of the protocols of one hierarchy into those of another for both Electronic Mail and Interactive Access. In addition our local network is linked as part of the DARPA Catenet. Those local hosts able to support Arpanet protocols can interwork with other hosts supporting the same protocols. In general, more services are available via conversion than via encapsulation.


Transmission Control Protocol Local Network Internet Protocol Network Code Transport Protocol 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1985

Authors and Affiliations

  • P. L. Higginson
    • 1
  1. 1.Department of Computer ScienceUniversity College LondonLondonUK

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