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The continuing speed increases of communication links at all levels from intra-server interconnects all the way to WAN results an increasing amount of network power consumption. Thus an effective, multi-level and multi-scale power management of communication links is increasingly important. In this paper the authors propose algorithms that can reduce link power consumption by exploiting three key attributes: available non-operational low power (or sleep) states, link width modulation, and link speed modulation. Although shutting down inactive links at coarse time scales is well known, their emphasis is primarily on finer-time granularities and can be used in addition to coarse grain methods.
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