[Asterisk-Users] X100P noise on ADSL line.

[David J Carter]

HI,

Had the same problem a while ago, X100p or a Modem caused the same problems
as your getting. Changed the Microfilter and the problems went away.

Tested the removed Microfilter and found the High pass filter was Knackered.
Mine also showed the error with a phone connected as well but not as bad.


Dave

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com]On Behalf Of WipeOut
Sent: 26 October 2004 11:35
To: asterisk-users at lists.digium.com
Subject: [Asterisk-Users] X100P noise on ADSL line.


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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