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

Paul Brooks pbrooks-link at layer10.com.au
Tue Nov 20 21:51:00 AEDT 2007

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.

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 
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.

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