Connectionless service over ATM networks is supported either, indirectly, by establishing separate end to end virtual connections between ATM end stations or directly by using a connectionless server (CLS). This paper presents an in-depth performance comparison of various buffer management strategies in the CLS for AAL5 traffic. All three logical buffers (cell-collection, processing, and departure) in a CLS are considered. Different buffer space allocation schemes and cell discarding mechanisms are studied with respect to their efficiency in buffer space utilisation, frame loss probability and forwarding delays for a given buffer size and traffic.
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