John Novack wrote: > > > Bob Chiodini wrote: > >> You might put 600 ohm/600 ohm matching transformer to isolate the >> port and the amp. Should also maintain loop current if needed. >> >> Bob... >> > FXO ports do not generate loop current, they detect loop current from > the Central office. > Think of an FXO as a controllable switch and matching transformer. > An FXO port will give Asterisk/Zaptel a red alarm without loop > current, so that probably won't work for a PA system that doesn't > supply battery. > What's wrong with using the (usually) unused sound card built into > many machines? > > John Novack Mostly it uses the wrong impedance, and I know I can probably get an impedance matching transformer, but I'm not allowed to spend any money that I don't need to. (Otherwise I'd have replaced the amp in the first place with one that didn't fall from the arc).
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