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The implementation of effective quality of service (QoS) support for user services must be implemented end-to-end and through all layers of the OSI hierarchy at each network node. We consider the layer-2 design of an ATM switch, which is built as a scalable, 3-stage Clos switching network and discuss architectural choices for the implementation of QoS support on this switch. An ATM-like cell format is used to encapsulate and propagate traffic and resource management information through the switch. Call admission control, fast inter-stage cell transfers and priority-based queue arbitration are used as congestion control and resource management mechanisms. Simulation results are presented to show the effect of architectural choices (internal buffering) on QoS parameters.
Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE (Volume:3 )
Date of Conference: 17-21 Nov. 2002