[Asterisk-Users] X100P noise on ADSL line.

[WipeOut]

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..