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<p><b>Abstract</b>—Next-generation networks are expected to support a wide variety of services. Some services such as video, voice, and plant control traffic have explicit timing requirements on a per-message basis rather than on the average. In this paper, we develop a general model of dual-link networks to support real-time communication. We examine the desirable properties of this network and the difficulties in achieving these properties. We then introduce the concept of <it>coherence</it> and develop a theory of coherent dual-link networks. We show that a coherent dual-link network can be analyzed as though it is a centralized system. We then discuss practical considerations in implementing a dual-link network, and implications of this work to address problems observed in the IEEE 802.6 metropolitan area network standard.</p>
Real-time scheduling, dual-link networks, coherence, priority, preemption, schedulability, T-schedulability, flow control, IEEE 802.6, DQDB.

S. S. Sathaye, J. K. Strosnider and L. Sha, "Analysis of Dual-Link Networks for Real-Time Applications," in IEEE Transactions on Computers, vol. 46, no. , pp. 1-13, 1997.
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