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-
Stephen,
Good question. Finding ground problems is an art.
First thing I should do: measuring your ground with respect of CO
ground. With a voltmeter between the tip wire of your CO line (0 VDC )
and your local ground, voltage should be less than 5 VDC.
Jorge
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