A performance model for an asynchronous optical buffer

Authors:
W. Rogiest;K. Laevens;D. Fiems;H. Bruneel
Affiliations:
SMACS Research Group, Ghent University, Sint-Pietersnieuwstraat 41, B-9000 Ghent, Belgium;SMACS Research Group, Ghent University, Sint-Pietersnieuwstraat 41, B-9000 Ghent, Belgium;SMACS Research Group, Ghent University, Sint-Pietersnieuwstraat 41, B-9000 Ghent, Belgium;SMACS Research Group, Ghent University, Sint-Pietersnieuwstraat 41, B-9000 Ghent, Belgium
Venue:
Performance Evaluation - Performance 2005
Year:
2005

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Abstract

We investigate the behaviour of an asynchronous optical buffer by means of a continuous-time queuing model. Through a limit procedure, previously obtained results for a discrete-time queuing model are translated to a continuous-time setting. We also show that the same results can be obtained by a direct analysis using Laplace transforms. Closed-form expressions are obtained for the cases of exponentially distributed burst sizes, deterministic burst sizes and mixtures of deterministic burst sizes. The performance of asynchronous optical buffers shows the same characteristics as that of synchronous optical buffers: a reduction in throughput due to the creation of voids on the outgoing channel and a burst loss probability that is strongly influenced by the choice of fiber delay line granularity. The optimal value of the latter depends on the burst size distribution and the offered load.