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Proceedings Paper

Modeling and performance evaluation of a modified Orwell protocol under symmetrical and asymmetrical traffic distributions
Author(s): Phil Holifield; Trevor Terrell; Philip Mars
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Paper Abstract

With the emergence of Broadband ISDN and the adoption of ATM as its transport mechanism there is a growing interest in slotted ring networks both for high speed packet switching and for multimedia LAN applications. This paper describes a slotted ring testbed which uses a modified Orwell protocol for media access, and which has enabled a study of the modified Orwell protocol under symmetrical and asymmetrical traffic flow distributions. The architecture of the slotted ring testbed is outlined, and analytical models for the protocol are presented for different traffic flow distributions. The analytical results are compared to experimental results obtained from the testbed. The suitability of the reset rate as an indicator of available bandwidth in an access control mechanism is considered, and it is shown that for constant traffic flow and traffic statistics the reset rate works well as an indicator of potential network congestion. Under changing traffic distributions and traffic arrival statistics, additional indicators of congestion are required. On-going work into access control for the test-bed in a integrated services environment is outlined.

Paper Details

Date Published: 17 February 1995
PDF: 8 pages
Proc. SPIE 2450, Broadband Networks: Strategies and Technologies, (17 February 1995); doi: 10.1117/12.201282
Show Author Affiliations
Phil Holifield, Univ. of Central Lancashire (United Kingdom)
Trevor Terrell, Univ. of Central Lancashire (United Kingdom)
Philip Mars, Univ. of Durham (United Kingdom)

Published in SPIE Proceedings Vol. 2450:
Broadband Networks: Strategies and Technologies
Robert A. Cryan; P. Nalinaj Fernando; Pierpaolo Ghiggino; John M. Senior, Editor(s)

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