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Reducing the Internet power consumption will become a challenging issue, since the Internet is expected to face a high growth in terms of traffic requirements. Simply scaling the network architecture, thus increasing its power consumption, proportionally to this growth would not be a practical solution. Various energy-efficient approaches have been considered, typically exploiting optical switching technologies at the core network layer since they allow to significantly reduce the quantity of high power-requiring optical/electronic/optical conversions and electronic processing operations. A further improvement can be obtained with Time Driven Switching (TDS), a technique which allows to switch "Fractions" of wavelengths directly in the optical domain exploiting the time-coordination of all network components.
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