[Asterisk-Users] X100P noise on ADSL line.

[WipeOut]

Following on from the message below I have discovered that the X100P 
causes the SNR on my ADSL line to drop even with the Asterisk box 
**switched off** and the power unplugged... This seems very strange.. 
Why should a card in a switched off PC cause noise on a line meaning 
that it drops out and has to reconnect quite often..

Anyone got any other ideas to try and stop it messing up my internet 
connection cos its causing havoc with my VoIP calls coming in and going 
out over the ADSL line..

Later..

WipeOut wrote:

> Hi,
>
> This may be one for the broadband guru's out there..
>
> I have a single analog line coming into the house.. This line is for 
> my ADSL and home phone.. My Asterisk box uses an X100P card to connect 
> to the analog line.. I have a microfilter on the line etc.. The rest 
> of my phone system works inbound and outbound calls via a VoIP 
> provider over the ADSL line..
>
> The problem I am having is that the X100P seems to introduce a lot of 
> noise on the line when it its connected to the "phone" socket on the 
> microfilter and this causes the ADSL quality to drop quite badly.. 
> When the X100P is not connected I have a signal to noise ratio of 29dB 
> downstream and 30dB upstream (this stays the same when I connect an 
> analog phone) when I connect the X100P the SNR drops to 12dB 
> downstream and 30dB upstream.. At 12dB I get a large number of CRC 
> errors and errored seconds on the ADSL connection..
>
> Anyone got any ideas why the X100P would cause this kind of 
> deterioration?
>
> Only thing I can think of is possibly something to do with ring 
> detection or that its acting on some of the frequencies that are being 
> used by the ADSL..
>
> Thanks for any thoughts..
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