A lot of attention has been paid to how server farms are using increasingly huge quantities of power, but apparently broadband systems aren't far behind.
The broadband DSL network consumes about 20 billion kilowatt-hours of energy per year worldwide - that's the equivalent of about 6 per cent of the UK's total electricity bill.
German scientists have come up with a way to allow ADSL systems to use a low power mode that no one has been able to use until now.
Power crazed
Most ADSL2/ADSL2+ systems have a low-power L2 mode that reduces power consumption when internet traffic is light. Unfortunately, when modems in L2 mode become active, they cause interference that slows traffic and can be so great it crashes neighbouring modems, requiring a time-consuming restart.
Scientsists at the Fraunhofer Institute for Communication Systems have now succeeded in using artificial or virtual noise to stabilize DSL connections so that the L2 mode can be used.
The artificial noise simulates typical cable interference so that when a modem connects to the internet, the system registers normal interference even if the device next door is in low-power mode. Although the connection is at a slightly reduced speed, it remains stable when a neighbour goes online.
Network operators could reduce their electricity consumption by several million kilowatt-hours each year, which should (eventually) mean lower broadband prices and more fossil fuels for all of us. Hurrah!
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anon654
June 25th 2009
1. A better solution would be to make the modems more stable without adding noise which reduces efficiency, speeds and probably adds a power usage of its own.
Also it would be an idea to implement FTTH more instead of still continuing with 'old' technologies which are limited by physics to lower speeds than fibre optic.
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