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The Computer Journal 1988 31(6):496-502; doi:10.1093/comjnl/31.6.496
© 1988 by British Computer Society
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An Experiment in Clock Synchronisation

R. Cole1 * and C. Foxcroft2 §

1 Hewlett Packard Laboratories, Stoke Gifford, Bristol BS12 6QZ, UK, 2 Department of Computer Science, University College London, Gower Street, London WC1E 6BT, UK

This paper describes an experiment to obtain an upper bound on the accuracy that can be expected when attempting to synchronise the system clock of one computer with the system clock of a physically remote computer. We used one computer in the U.K. and a number of computers in the U.S., linked by a complex datagram network, to provide a worst-case environment.

This paper gives some reasons for wanting to synchronise clocks and the relationship to previous work. The experimental problems are discussed and the results analysed.

Received January 1987. revised April 1987.

* Address for correspondence: Hewlett Packard Laboratories, Stoke Gifford, Bristol BS12 6QZ.

§ BICC Data Networks, Hemel Hempstead.

Department of Computer Science, University College London, Gower Street, London WC1E 6BT


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