Major Dynamic Power Management methods in wired networks: A new taxonomy

Electricity consumption of Information and Communications Technology (ICT) reached a total of about 900 TWh per year in 2012 and electricity generation for ICT continues to contribute over 2% of the human-generated CO
₂
to the atmosphere. Energy costs are rapidly becoming the major operational expense for ICT and may soon dwarf capital expenses as software and hardware continue to drop in price. Energy consumption of wired networks as the dominant communications technology in enterprises and datacenters has been subject to significant research in the past years to reduce this cost and making networks more energy-efficient. This paper focuses on the major methods at the system-level to achieve this goal, and systematically reviews them in the context of a new taxonomy.