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

[Sebastian Arcus]

Hi,

I've tried both an AMD and an Intel motherboard - with identical results.

Sebastian


On 04/03/12 15:32, Carlos Rojas wrote:
> Hello
>
> Are you using a amd server?
>
> Sometimes openvox doesn't work fine with amd processor
>
> Regards
>
> On Mar 1, 2012 2:07 PM, "Dave Platt" <dplatt at radagast.org
> <mailto: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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