ADSL/VDSL uses phone lines but operate in the hundred kilohertz to several megahertz range, so all the sounds are ultrasonic. Still, it would be nice to see the

ADSL/VDSL uses phone lines but operate in the hundred kilohertz to several megahertz range, so all the sounds are ultrasonic. Still, it would be nice to see the recordings and plot them visually in a spectrogram. DOCSIS uses many megahertz of bandwidth too, and similarly you can't hear stuff but it would be interesting to see a spectrogram.