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Vorträge und Posterpräsentationen (mit Tagungsband-Eintrag):

T. Losert, W. Elmenreich, M. Schlager:
"Semi-Automatic Compensation of the Propagation-Delay in Fault-Tolerant Systems";
Vortrag: IASTED International Conference on Communications, Internet, and Information Technology (CIIT 2004), US Virgin Islands; 22.11.2004 - 24.11.2004; in: "Proceedings of the Third International Conference on Communications, Internet, and Information Technology (CIIT 2004)", ACTA Press, (2004), ISBN: 0-88986-445-4; S. 455 - 460.



Kurzfassung englisch:
In control systems the jitter is a major problem since in a time-varying system the theoretical results for analysis and design of time-invariant systems cannot be used directly. Reducing the jitter increases the stability of the closed control-loop thus leading to enhanced reliability.

This paper presents a general model that can be applied to bus topologies as well as to star topologies. Based on this model an algorithm is presented that allows to improve the precision of a set of distributed clocks by measuring the propagation delay of the communication lines and compensating the jitter introduced by the propagation delay.

Some fault-tolerant architectures already provide means for coping with propagation delays but require manually entering the values in a configuration-tool. With this algorithm the system supports this errorprone task by providing validity checks for the entered values or measuring these values automatically thus rendering this maintenance step obsolete.


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