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A comment on ADSL works over wet string (2017). Parent comment

Re:ADSL works over wet string (2017) by goodpoint on Sunday December 05, 2021 @05:41AM (#29448262)
> modulating the voltage but keeping that voltage always above zero

In signal transmission theory people almost always think in terms of frequency ranges.

Any DC component is simply a frequency set to 0 - that can be ignored.

Similar to the earth magnetic field when talking about radio transmission in air.

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Re:ADSL works over wet string (2017) by Eelongate on Tuesday December 07, 2021 @12:30AM (#29469343)
Sure, but it's still not AC. It's VDC or PDC, not AC. It's not AC if the Current isn't Alternating.
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