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Dynamic Spectrum Management (DSM) has been recognized as a key technology for tackling multi-user crosstalk interference in DSL broadband access networks. The major objective of DSM so far has mainly been to maximize the user data rates. Recently, however, the reduction of power consumption has become an important, additional design goal for broadband technologies, driven by economical arguments (rising electricity prices) as well as ecological arguments (ICTs impact on global CO2 emissions). In this paper, the aouhors propose a unified "Green DSL" framework that extends the traditional data rate driven DSM towards a much wider energy-efficient scope. The authors demonstrate how this framework allows a much larger modeling freedom so as to obtain the desired trade-off between fast and green DSL broadband access.
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