Stephen Bosch wrote:
Stephen Bosch wrote:
Stephen Bosch wrote:
Hi:
I have a Sangoma A200 card installed in a server with two FXO modules
and one FXS module.
Analog sets connected to the FXS module have a "squeaky static" -- it's
like static mixed with the sound of someone vigorously cleaning a window
a few doors down.
In other words, it's not a classic static noise, but it is noise, and
it's distracting. Remote callers can hear this noise.
I have, by turns:
- Tested the line with the same analog sets plugged in at the
demarcation point. No noise. (None of the SIP devices in this
configuration have this noise for outgoing calls, so I'm sure it's got
something to do with the FXS module).
- Plugged the known good analog sets straight into the server
- Moved the FXS module off the REMORA daughtercard to the main card
- Replaced the FXS module with a new one
- Run the server off of battery power, to see if the noise is garbage
leaking in off the AC
- Turned off the PoE midspan
The next thing I'm going to try is turning off the switch it's plugged
into. When that is done, I'll have done everything short of move the
server to a different location.
Maybe the power supply is generating this crap.
Hmn. I'm going to test this hypothesis.
Okay -- that didn't work. I swapped the power supply out with a better
one, and even disconnected the extra ventilation fan. The noise is
different but still there.
To those with experience with FXS modules, I welcome your input.
-Stephen-
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?
Hope this helps
Jorge
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