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SDLC protocol throughput analysis

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Richard W. PlummerAuthors Info & Claims

WSC '85: Proceedings of the 17th conference on Winter simulation

Pages 331 - 340

https://doi.org/10.1145/21850.253380

Published: 15 December 1985 Publication History

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Abstract

A mathematical model is presented to determine large message throughput utilizing Synchronous Data Link Control (SDLC) protocol in local or long haul networks. The model includes provisions for wait time which includes processor service times, plus satellite and/or land based propagation delays. Other inputs include the probability of ACK/NAK timeout, block size, and assumed bit error rate.

Bit errors may be precipitated by electromechanical equipment malfunctions, lightning, power surges, crosstalk, thermal noise, and numerous other causes. Although bit errors are, therefore, bursty in nature, this analysis assumes that the bit error rate is random rather than bursty which will provide conservative results.

Basic feedback theory is applied to both clarify and simplify the analysis. A detailed example illustrates use of the model in a Communication Satellite application to illustrate large message throughput degradation caused by the Satellite propagation delay for various bit error rates.

An empirically derived simple expression to determine optimum block size for maximum throughput as a function of bit error rate is presented for the stated assumptions.

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Information

Published In

WSC '85: Proceedings of the 17th conference on Winter simulation

December 1985

620 pages

ISBN:0911801073

DOI:10.1145/21850

Editors:
Donald T. Gantz
George Mason Univ., Fairfax, VA
,
Gerard C. Blais
Federal Computer Performance Evaluation and Simulation Center
,
Susan L. Solomon
California State Univ., Sacramento

Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Association for Computing Machinery

New York, NY, United States

Publication History

Published: 15 December 1985

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