 Internet traffic exhibits self-similarity and longrange dependence (LRD) on various time scales. In this work, we analyze IP traffic traces measured on a MAN link of the telecommunications operator FASTWEB. We emphasize results obtained using the Modified Allan Variance (MAVAR), a wellknown time-domain tool originally conceived to discriminate noise types with power-law spectrum (i.e., fractional noise) in frequency stability measurement, which has been introduced in network traffic analysis only recently. MAVAR has been demonstrated to feature superior spectral sensitivity and accuracy in fractional-noise parameter estimation, coupled with outstanding robustness against nonstationarity in data analyzed. Logscale diagrams are also evaluated, to confirm MAVAR experimental findings. All traffic traces analyzed exhibit prominent evidence of fractional noise. Model parameters are estimated. Results obtained are valuable to establish IP traffic models, e.g. necessary for realistic input traffic synthesis in network simulation.Index Terms  Fractional noise, Internet, metropolitan area network, long-range dependence, self-similarity, traffic measurement (communication).

This contribution deals with the RWA (routing and wavelength assignment) in semi-transparent optical networks. In semi-transparent networks, a parameter called Maximum Transmission Distance (MTD) is used to indicate the distance reachable in wavelength continuity. When for a given lightpath, the signal cannot be detected at the destination node a regenerator has to be installed in an intermediate node. The regenerator breaks up the optical continuity and the optical network becomes a semi-transparent optical network. The new RWA mechanism proposed in this paper will take into account the physical impairment such as the Maximum Transmission Distance (MTD). Moreover this new RWA algorithm will be based on the Prediction-Based Routing (PBR) mechanism and will take into account the routing inaccuracy problem. The goal of the proposed algorithm will be both, to reduce the number of blocked connections due to the routing inaccuracy problem and to select routes that fulfil the MTD physical impairment.

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