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Energy saving is a really interesting topic in today's networks. Indeed, Information and Communication Technologies (ICT) systems are energy greedy, they require more and more energy and as energy is more and more expensive, thus we seek to save it. Accordingly, energy saving has recently received considerable attention as a promising approach for delivering ICT services with environmentally conscious use of smart technology. Thus, this paper addresses the issue of energy consumption in broadband and carrier networks and especially in Carrier-Ethernet networks. We review and describe relevant works currently proposed for energy-efficient operation of wired network infrastructure. Accordingly, in this paper we survey and discuss different technical issues related to energy saving. Furthermore, we have classified energy aware strategies in two main categories. Research proposals related to each …