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It is not a sort of electrical or signal specification.
Hi Striek, that is exactly what the standard defines. If one were to place this in the OSI model it would be Layer 1. ;) Chances are it will work because the European standards body adapted the American standard when ADSL was deployed. ADSL transmits 256 different 4khz tones. Notice I used the word "tone". ADSL is older technology and in reality some early deployments only worked well on vendor specific modems but now I would wager any old ADSL subscription would work fine.