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The authors propose and investigate an energy-saving algorithm for DOCSIS-3.0 cable access networks. Numerical simulations indicate a possible 17.4% energy-saving for 8000 cable modems, but also reveal a fundamental trade-off between energy and delay. Lately, reducing the energy cost has become one of the daunting challenges in Information and Communication Technology (ICT). It is estimated that 37% of the ICT carbon emission is due to operating the Telecom infrastructure and equipments, especially in the access networks. Driven by this trend, effective energy-saving strategies are being sought to architect "Green" broadband cable access networks.
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