[LINK] Carbon Neutral Linux Computers, Canberra, 21 November 2007

[Paul Brooks]

Richard Chirgwin wrote:
>
> - fast-boot broadband NTUs that can switch themselves off when idle, 
> and only become active when asked to communicate (why have a 100% on 
> cycle for a 25% duty cycle?).
This is already built into ADSL2, 2+ and VDSL2 standards - look for L2 
and L3 low-power states in your search engine of choice.

See 
http://www.commsdesign.com/article/printableArticle.jhtml?articleID=16505317, 
about half-way down under the heading 'Power Enhancements'.
The L2 and L3 modes save power at the NTU, as a byproduct of saving 
power at the DSLAM (which also reduces heat-load in the exchange, and 
hence reduces aircon costs/emissions)

I also turned up Code of Conduct,on Energy Consumption of Broadband 
Equipment 
<http://www.initiative-energieeffizienz.de/fileadmin/InitiativeEnergieEffizienz/dachmarke/downloads/EU-Dokumente/Code_of_Conduct_Broadband_Equipment__-_FINAL_July__.pdf>, 
a July 2006 standard for the EU that aims to minimise power consumption 
of broadband equipment (both network and CPE) by widespread use of the 
L2 and L3 states by 1 January 2008.