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The next generation of communication subsystems must support diverse applications (such as interactive voice and video conferencing, supercomputer visualization, and remote process control) operating over high-performance networks (such as FDDI and B-ISDN). This paper describes a framework containing a number of resources, languages, and tools for generating customized protocols that support diverse multimedia applications running on highperformance networks. The framework also facilitates the configuration of application-tailored, function-based communication protocols that are automatically synthesized from high-level specifrcations.

We present a scheduling scheme that allows a munber of customers to share a common resource in an efficient and fair way. Each customer is allowed to use the resource for a time that does not ,exceed a certain limit, that limit being a function of the waiting time elapsed between the time of its last request and the time of access to the resource. After expiration of the service time allocated to a customer, i f more service is still needed, the customer has to re-enter the request queue and issue a new service request. This scheme combines the advantages of both processor sharing and FCFS disciplines. in a dynamic way. We also show the applicability and the advantages of our scheme in both open and closed system environments.