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Type Book Chapter
Scope Discipline-based scholarship
Title The energy intensity of the internet: home and access networks
Organization Unit
Authors
  • Vlad C Coroama
  • Daniel Schien
  • Chris Preist
  • Lorenz Hilty
Editors
  • Lorenz Hilty
  • Bernard Aebischer
Item Subtype Original Work
Refereed Yes
Status Published in final form
Language
  • English
Booktitle ICT Innovations for Sustainability
Series Name Advances in Intelligent Systems and Computing
ISBN 978-3-319-09227-0 (P) 978-3-319-09228-7 (E)
ISSN 2194-5357
Number 310
Place of Publication Cham
Publisher Springer
Page Range 137 - 155
Date 2015
Abstract Text Estimates of the energy intensity of the Internet diverge by several orders of magnitude. We present existing assessments and identify diverging definitions of the system boundary as the main reason for this large spread. The decision of whether or not to include end devices influences the result by 1-2 orders of magnitude. If end devices are excluded, customer premises equipment (CPE) and access networks have a dominant influence. Of less influence is the consideration of cooling equipment and other overhead, redundancy equipment, and the amplifiers in the optical fibers. We argue against the inclusion of end devices when assessing the energy intensity of the Internet, but in favor of including CPE, access networks, redundancy equipment, cooling and other overhead as well as optical fibers. We further show that the intensities of the metro and core network are best modeled as energy per data, while the intensity of CPE and access networks are best modeled as energy per time (i.e., power), making overall assessments challenging. The chapter concludes with a formula for the energy intensity of CPE and access networks. The formula is presented both in generic form as well as with concrete estimates of the average case to be used in quick assessments by practitioners. The following chapter develops a similar formula for the core and edge networks. Taken together, the two chapters provide an assessment method of the Internet's energy intensity that takes into account dierent modeling paradigms for dierent parts of the network.
Digital Object Identifier 10.1007/978-3-319-09228-7_8
Other Identification Number merlin-id:10301
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Additional Information The final publication is available at Springer via http://dx.doi.org/10.1007/978-3-319-09228-7_8