I’m wondering how you used an oscilloscope to diagnose the ~1ghz bandwidth DOCSIS signals on broadband cable. I have a (expensive!) gigahertz bandwidth scope but I’m not sure what I’d look for on it if I connected it to my cable.
The upstream channels are squarely in the HF to VHF range. The downstream channels (which typically require more bandwidth) start at about the same HF frequency (42MHz) but can extend above 1GHz. Each channel, however, is relatively bandwidth limited.
I should clarify that I didn't really do any _true_ diagnostic with the scope. Simply as an attempt to gather as much data as possible, I connected the oscilloscope to see what the signals looked like. And, because, why not. I had driven 2+ hours to get there, might as well try everything! I didn't expect it to actually be able to decode the signals. I was surprised to find a correlation between the modem losing sync and a visually-distinct pattern appearing on the scope though.