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Some properties of timed token medium access protocols

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3 Author(s)
Valenzano, A. ; Politecnico di Torino, Italy ; Montuschi, P. ; Ciminiera, L.

Timed-token protocols are used to handle, on the same local area network, both real-time and non-real-time traffic. The authors analyze this type of protocol, giving worst-case values for the throughput of non-real-time traffic and the average token rotation time. Results are obtained for synchronous traffic generated according to a generic periodic pattern under heavy conditions for non-real-time traffic and express not only theoretical lower bounds but values deriving from the analysis of some real networks. A model which addresses the asynchronous overrun problem is presented. The influence of introducing multiple priority classes for non-real-time traffic on the total throughput of this type of message is shown. It is also shown that the differences between the values obtained under worst-case assumptions are close to those obtained under best-case assumptions; the method may therefore be used to provide important guidelines in properly tuning timed-token protocol parameters for each specific network installation

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Software Engineering, IEEE Transactions on  (Volume:16 ,  Issue: 8 )