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SUMMARY:Insomnia in the Access or How to Curb Access Network Related Energ
 y Consumption - Marco Canini (EPFL)
DTSTART:20110722T150000Z
DTEND:20110722T160000Z
UID:TALK32113@talks.cam.ac.uk
CONTACT:Eiko Yoneki
DESCRIPTION:Access networks include modems\, home gateways\, and DSL Acces
 s Multiplexers (DSLAMs)\, and are responsible for 70-80% of total network-
 based energy consumption. In this talk\, I take an in-depth look at the pr
 oblem of greening access networks\, identify root problems\, and propose p
 ractical solutions for their user- and ISP-parts. On the user side\, the c
 ombination of continuous light traffic and lack of alternative paths conde
 mns gateways to being powered most of the time despite having Sleep-on-Idl
 e (SoI) capabilities. To address this\, we introduce Broadband Hitch-Hikin
 g (BH^2)\, that takes advantage of the overlap of wireless networks to agg
 regate user traffic in as few gateways as possible. In current urban setti
 ngs BH^2 can power off 65-90% of gateways. Powering off gateways permits t
 he remaining ones to synchronize at higher speeds due to reduced crosstalk
  from having fewer active lines. Our tests reveal speedup up to 25%. On th
 e ISP side\, we propose introducing simple inexpensive switches at the dis
 tribution frame for batching active lines to a subset of cards letting the
  remaining ones sleep. Overall\, our results show an 80% energy savings ma
 rgin in access networks. The combination of BH^2 and switching gets close 
 to this margin\, saving 66% on average.\n\nBio:\nMarco Canini is a postdoc
 toral researcher at the Networked Systems Laboratory\, EPFL\, Switzerland.
  His research focuses on computer networking with emphasis on rethinking I
 nternet fundamentals to include power awareness and improve Internet's ene
 rgy efficiency\, methods for Internet traffic classification based on appl
 ication identification\, and design of network monitoring applications. An
 other area of interest concerns improving the reliability of distributed s
 ystems\, in particular the reliability of critical infrastructure such as 
 the Internet's inter-domain routing system. He holds a laurea degree with 
 honors and a Ph.D. degree in Computer Science and Engineering from the Uni
 versity of Genoa\, Italy. During his Ph.D.\, he was invited as a visitor t
 o the University of Cambridge\, Computer Laboratory. He also held position
 s at Intel Research and Google.\n\n
LOCATION:FW26\, Computer Laboratory\, William Gates Builiding
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