Résumé

Generally, a customer is unable to forecast the traffic profile of a connectionless service submitted to the B-ISDN. Hence the established traffic contract may be based on wrong assumptions that can cause contract violation and hence too much loss due to policing. This loss reduces considerably when introducing an adaptive prevention mechanism. On the bases of earlier simulation studies of DQDB, a stochastic mode/ describing a connectionless service has been elaborated. This mode/ served for performance studies of the proposed prevention mechanism. The loss due to po/icing is reduced about up to a factor 100. The connectionless server (CLS) within the B-ISDN is characterized as a statistical multiplexer. The adaptive prevention mechanism yields good performance for a CLS with short buffers.

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