ADSL still pretty different to something like Ethernet - not that i understand Ethernet terribly well either. Ethernet is baseband: it really is a digital on-off signal, with Manchester encoding, 8/10 encoding, 64/66 encoding, etc. ADSL is broadband: there is modulation into phase and frequency patterns.
Mind you, 8/10 encoding is amazing as well, and a good explanation of that would be well worth a read for this audience!
Mind you, 8/10 encoding is amazing as well, and a good explanation of that would be well worth a read for this audience!