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The authors consider the power-efficient design of an Internet Protocol (IP)- over-Wavelength Division Multiplexing (WDM) network, tackling the problem of deciding which equipment needs to be installed in both the optical and IP layer. Their model explicitly targets the minimization of cost considered as either Capital Expenditures (CapEx) or power. In contrast to the models already presented in the paper, they take into account routing constraints and consider a comprehensive set of realistic scenarios defined by a network topology, traffic, cost and power values of network devices in both layers. Results indicate that the introduction of realistic constraints and parameters still allows power-efficient networks to be designed.
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