[asterisk-users] Line noise/hiss on Openvox A400P card on FXO

Carlos Rojas crt.rojas at gmail.com
Sun Mar 4 09:32:40 CST 2012


Are you using a amd server?

Sometimes openvox doesn't work fine with amd processor

On Mar 1, 2012 2:07 PM, "Dave Platt" <dplatt at radagast.org> wrote:

> > 5. Placing ferrite cores on the phone cables.
> Do either of the phone lines in question have DSL on them?
> If so, a ferrite core (which will block common-mode RF
> signals) probably won't help much, if at all.  DSL is a
> differential-mode signal, and its frequency content starts
> down in the tens of kHz.  Ferrite cores are usually intended
> to block much higher frequency interference, and won't have
> enough inductance to help much with DSL signals.
> What I would suggest, is that you get yourself a couple
> of DSL "microfilters"... plug them into the A400P FXO
> ports, and plug the lines into the filters.  These sorts
> of filters are designed specifically to block DSL differential-
> mode signals from getting into analog-phone circuits, and
> they will also be fairly effective against other forms
> of low-frequency-RF noise.
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