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 Artificial Noise Saves Energy For Computer Network Providers

This story is from the category Connectivity
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Date posted: 23/07/2009

Ecological and economic factors are prompting telecommunications companies to deploy energy-saving systems. The broadband DSL access network consumes about 20 billion kilowatt-hours of energy per year worldwide ? equivalent to four percent of Germany?s annual energy consumption.

The use of a low-power mode (L2 mode) in standard ADSL2/ADSL2+ systems could significantly reduce the amount of electricity consumed by the DSL network. At present, broadband access always runs on full power, but the L2 mode could reduce the transmission output of the system and therefore its power usage during quiescent communication.

Scientsists at the Fraunhofer Institute for Communication Systems ESK have now succeeded in using artificial or virtual noise to stabilize DSL connections so that L2 mode can be deployed. The artificial noise simulates typical cable bundle interference to the broadband receivers. When a modem tries to connect to the Internet, the system registers normal interference even if the device next door is in low-power mode. Although the connection does not take place at the highest-possible transmission rate but at a slightly reduced speed, it remains stable when a neighbor goes online. Both the L2 mode and artificial noise can be used now.

See the full Story via external site: www.sciencedaily.com



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