So I just got VDSL, yay! Actually it’s more of a nay, given that it’s slower than the ADSL I used to have. While my ISP is supposedly busy analysing the problem, I have utilised my modified direct sampling RTL2832 to visualise what’s happening during the VDSL sync/handshake. (Using just a piece of wire taped along the phone line)
This looks interesting. Apart from taking a screenshot of gqrx, did you capture data in some file? I wonder if it would be possible to wiretap and demodulate frames from the internet connection.
I haven’t tried to do anything with it so far, but in theory it should be possible for lower speeds. Though for the top tier modulations used by VDSL I’d imagine the 8-bit ADCs (and thus the low SNR) of the RTLSDR would make it impossible to do so.