Cisco Likes Spectral Efficiency

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  1. Spectrum efficiency is important in xDSL too as a way of squeezing the maximum total bandwidth from a bundle of copper wires, while maintaining reliable connections for the DSL routers. Telcos and equipment vendors have specialised dynamic spectrum management tools that go through the whole network re-optimising it for current conditions (which can include weather).

    This is what enables ADSL2+ and VDSL2 to work well and compete somewhat with fibre to the premises.

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