Mr AG!! wrote:

Why are there FXO cards, and FXS cards? What's the difference, and why
is it needed? Modem cards, seem to be able to dial out, and receive
calls, so why are these cards different?


FXO card = plug to phone line
FXS card  = plug to regular phone

FXS provides power to phone. FXO takes power from phone line.

Don't plug PSTN in your FXS card or you could fry it...

Cheers,
Jean-Michel.

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