[asterisk-users] Noise on FXS ports (Sangoma)

[John Novack]

Hearing the "noise" might be of some help.
It seems as if it might be some sort of digital noise.
I have an A200 working, but no expansion board with no such noise.
Also I have NEVER had to run the gain as high as some others suggest on 
the FXO ports.

John Novack


François Delawarde wrote:
> Hi,
>
> What about your timing source? Did you check with zttest if you had 
> any interrupt loss? Do your card share interrupts with other source? 
> Are you using a Xen kernel or an IDE hard drive without DMA activated?
>
> François.
>
>
> Stephen Bosch wrote:
>> Hi, Jorge:
>>
>> Jorge Mendoza wrote:
>>  
>>>>         
>>> Never experienced with FXS modules on a PC with  Asterisk. However we
>>> have experienced that kind of problems on legacy PBX without a good
>>> ground. If you replace the system with a analogue set and have not
>>> noise, then a ground current is generated in your system, probably
>>> originated at FXO side. Have you tested the PC isolated, with not lines
>>> and not switches? just the FXS calling the voicemail?
>>>     
>>
>> No, I haven't gone that far yet, but it might be worth trying.
>>
>> One question I have: if this turned out to be the cause, what could I do
>> to clean up the ground? There are so many elements -- the power supply
>> ground, the telephone lines, the network cable ground, etc.
>>
>> -Stephen-
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