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Abstract Local area networks have long been establi Local area networks have long been established as the basis for distributed systems. Continuity of service and bounded and known message delivery latency are requirements of a number of applications, which are imperfectly fulfilled by standard LANs. Most previous studies have assumed only a normal LAN operation in the derivation of worst-case access/transmission delays. However, LANs are subject to failures, namely partitions. Since most applications can live with temporary glitches, reliable real-time operation is possible on non?replicated LANs, provided that these temporary partitions are time-bounded. We call these periods of inaccessibility, to differentiate from classical partitions. This work investigates the inaccessibility characteristics of a given set of standardised token-based local area networks, namely ISO 8802/4 Token-Bus, ISO 8802/5 Token-Ring and ISO 9314 FDDI. This study allows, for each one of the mentioned LANs, the derivation of a worst-case inaccessibility figure, to be added to the worst-case transmission delay in the absence of faults. The study is interesting on the grounds that it provides a basis to predict LAN performance in the presence of failures, and provides guidance on how to improve the inaccessibility time figures. improve the inaccessibility time figures.
Author José Rufino + , Paulo Verissimo +
Institution INESC  +
Key Rt26-92  +
Month apr  +
NumPubDate 1,992.04  +
ResearchLine Timeliness and Adaptation in Dependable Systems (TADS) +
Title A study on the inaccessibility characteristics of token-based standard LANs  +
Type techreport  +
Url  +
Year 1992  +
Categories Publication  +
Modification dateThis property is a special property in this wiki. 15 January 2013 13:03:02  +
NumberThis property is a special property in this wiki. RT-26/92  +
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