New class of high speed LAN access protocols based on the principle of timed packet release

David W. Pritty, Duncan N. Smeed, Norman L. Lawrie

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

1 Citation (Scopus)


This paper describes a class of protocols, based on the principle of Timed Packet Release - or TPR, which provide access to high speed local area network bus structures The principle behind TPR is a system of time delays in the nodes, reckoned from a common timing reference signal generated at a suitable point on the bus structure. By arranging for the delays in each node to increase according to its physical location on the bus nodes always detect packets from "upstream" nodes before their time delay expires. The TPR protocols described in this paper operate on linear bidirectional and unidirectional buses - although the TPR principle can be realised in a number of versions to provide collision free, prioritised, deterministic access to various bus topologies including hub/star. A comparative evaluation of their performance with established methods of bidirectional bus access such as token passing and the reservation protocols is obtained using discrete event simulation. Performance is measured in terms of the average delay-throughput characteristics of the protocols at data rates extending into the Gigabits/sec. region.

Original languageEnglish
Title of host publication20th Conference on Local Computer Networks, 1995. Proceedings
Place of PublicationLos Alamitos, CA.
Number of pages10
Publication statusPublished - 1995
Event20th Conference on Local Computer Networks, 1995 - Minneapolis, United States
Duration: 16 Oct 199519 Oct 1995


Conference20th Conference on Local Computer Networks, 1995
Country/TerritoryUnited States


  • access protocols
  • discrete event simulation
  • local area networks
  • performance evaluation
  • computer simulation
  • data communication systems
  • electric delay lines
  • electric network topology
  • interconnection networks
  • network protocols
  • packet switching
  • performance

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