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Energies 2016, 9(7), 500;

Greening the NetFPGA Reference Router

School of Electronic Engineering, Dublin City University, Dublin 9, Ireland
School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Luca Chiaraviglio
Received: 3 April 2016 / Revised: 27 May 2016 / Accepted: 17 June 2016 / Published: 29 June 2016
(This article belongs to the Special Issue Energy-Efficient and Sustainable Networking)
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Energy efficiency is an important criterion in the design of next generation networks for both economic and environmental concerns. This paper presents an energy-efficient router that is able to dynamically adapt its routing capability in response to real-time traffic load, achieving energy proportional routing. The NetFPGA reference router, which operates at one of two frequencies (125 MHz or 62.5 MHz), requires a board reset to switch frequencies. We have modified the reference router to allow dynamic switching among five operating frequencies. Experiments with real traces indicate that, compared to the reference router, a 10% power reduction can be achieved through dynamic frequency scaling. When the router is further modified to support green traffic engineering and Ethernet port shut-down, power consumption can be reduced by 46% while maintaining the required quality of service. This allows the router to meet the instantaneous performance requirements while minimizing power dissipation. Similar results can be expected when these general power-saving principles are applied in future commercial routers. View Full-Text
Keywords: green networking; energy proportional routing; dynamic frequency scaling green networking; energy proportional routing; dynamic frequency scaling

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Guo, F.; Wang, X.; Song, M.; Wei, Y.; Ormond, O.; Collier, M. Greening the NetFPGA Reference Router. Energies 2016, 9, 500.

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