I would say that any one of those 3 reasons, if they were to be at 0dBc from the modem power level in the frequency range that the modems using.
But to answer your question on what would be more likely to become the winner -- it's been my experience that impulse noise, which most call electrical interferance or when there's capacitence which looks very similar to CPD is at such a high level as to cause a problem would probably be my pick in the percentage game.
But I've also seen common path just singing to beat the band, but if on a newer lockdown system (90's & H to H, especially next to an active device) trapped (from 17 tap & below) this will drastically reduce the chances of that happening. This will also prevent the chance of stray RF from entering the up or downstream.
People just need to keep things tight. Fingering it is not enough. If RF was water, a lot of people would be soaking wet.
Just my $.02.
P.S. - Never forget -- it just takes 1 noisy drop to spoil an otherwise silent node.
Re: Return Noise
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