[Asterisk-Users] X100P noise on ADSL line.

[Jay Milk]

Without getting too technical (because I can't), I have a similar
configuration here without any problems.  X100P connected to a POTS line
which I only kept to carry ADSL.  This allows me to dial 911.  However,
what may be unusual is the filter/splitter the ADSL installer left for
me to use: It installs in the demarq box, so coming into the house I
have two pairs, one for DSL, one for POTS.  Both lines run UTP to the
wiring closet in the basement, then more UTP to the office on the second
floor.  DSL is terminated into a Speedstream 5861 Router (sliced bread,
move over).

> -----Original Message-----
> From: WipeOut [mailto:wipe_out at users.sourceforge.net] 
> Sent: Tuesday, October 26, 2004 5:35 AM
> 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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