Stuart Corner
Friday, 02 November 2007 06:54
Business IT -
Technology
Page 2 of 3
Level 3 is akin to multiple input multiple output (MIMO) technology in wireless where the system makes use of multiple paths to deliver optimum data throughput. In DSM level 3 all pairs are managed individually so as to optimise total throughput on the multipair cable.
A detailed technical explanation can be found in
this Alcatel Lucent white paper , dated June 2005. It said that DSM level 3was currently still too complex for implementation on the available DSL digital chips. However commercial products implementing DSM at level 1 are available (see below).
The University of Princeton has a
FAST Copper research project running form 2004 - 2008 funded by the US National Science Foundation's Information Technology Research program.
It goal is "Realizing the vision of truly broadband and ubiquitous access to almost everyone in the US" without the huge cost of laying fibre. It says: "This goal will be achieved through two threads of research: dynamic and joint optimisation of resources in Frequency, Amplitude, Space, and Time (thus the name 'FAST') to overcome the attenuation and crosstalk bottlenecks, and the integration of communication, networking, computation, modelling, and distributed information management for architectural design of broadband access networks."
It is working towards a goal of developing technologies that will enable DSL links to operate at 100Mbps and to deliver a symmetrical 250Mbps at distances up to 500 metres.
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