The powermanagement of ICT systems, that is, data processing (Dp) and telecommunication (Tlc) systems, is becoming a relevant\nproblem in economical terms. Dp systems totalize millions of servers and associated subsystems (processors, monitors, storage\ndevices, etc.) all over the world that need to be electrically powered. Dp systems are also used in the government of Tlc systems,\nwhich, besides requiring Dp electrical power, also require Tlc-specific power, both for mobile networks (with their cell-phone\ntowers and associated subsystems: base stations, subscriber stations, switching nodes, etc.) and for wired networks (with their\nrouters, gateways, switches, etc.). ICT research is thus expected to investigate into methods to reduce Dp- and Tlc-specific power\nconsumption. However, saving power may turn into waste of performance, in other words, into waste of ICT quality of service\n(QoS). This paper investigates the Dp and Tlc power management policies that look at compromises between power saving and\nQoS
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