asterisk users - Apr 2005 - Terrible crackling on analogue line and X100P card

Dear all ...

I'm experiencing terrible trouble with crackling and noise on an
analogue line connected to an X100P (compatible) card. I've checked the
line with a normal analogue phone and it works fine, clear as a bell,
but any outgoing or incoming calls to Asterisk are almost completely
drowned out by loud crackling.

I've attempted to adjust the RX and TX gains, but to no avail. There's
also an echo, but only one way. I'm assuming this is a separate issue so
I've not done much to investigate that, but I may be wrong so if it is
related does anyone have any suggestions?

I never had this trouble with ISDN, but then I wouldn't would I? :)

If anyone can wave a magic wand, or at the very least point me to a
website where I can get my own magic wand, please let me know.

Thanks

Stuart

It Stuart...Wonder if We're long lost cousins or something...Name here
is Bill Ford...

Anyway...It sounds like a "mechanical" problem. Maybe something as
simple as dirty contacts on the RJ-11 on the X100P. You say you've
checked the line...but have you replaced the cable from the demark to
the server....You might try pulling the X100 and reseating it, also
clean the contacts on the card's rj.

On Apr 9, 2005 8:56 AM, Stuart Ford <stuart.ford@rhydio.com>
wrote:
> Dear all ...
> 
> I'm experiencing terrible trouble with crackling and noise on an
> analogue line connected to an X100P (compatible) card. I've checked the
> line with a normal analogue phone and it works fine, clear as a bell,
> but any outgoing or incoming calls to Asterisk are almost completely
> drowned out by loud crackling.
> 
> I've attempted to adjust the RX and TX gains, but to no avail.
There's
> also an echo, but only one way. I'm assuming this is a separate issue
so
> I've not done much to investigate that, but I may be wrong so if it is
> related does anyone have any suggestions?
> 
> I never had this trouble with ISDN, but then I wouldn't would I? :)
> 
> If anyone can wave a magic wand, or at the very least point me to a
> website where I can get my own magic wand, please let me know.
> 
> Thanks
> 
> Stuart
> 
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users@lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
>

I have a similar situation but it seems to vary from call to call
sometimes.

Using 2 digium genuine x100p's in a dell with riser card.

I'm wondering if it is something to do with the riser because it doesn't
seem to matter if I swap various cords, positions, etc.


Cheers,
Dean 



> -----Original Message-----
> From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-
> bounces@lists.digium.com] On Behalf Of Stuart Ford
> Sent: Saturday, April 09, 2005 9:57 AM
> To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
> Subject: [Asterisk-Users] Terrible crackling on analogue line and
X100P
> card
> 
> Dear all ...
> 
> I'm experiencing terrible trouble with crackling and noise on an
> analogue line connected to an X100P (compatible) card. I've checked
the
> line with a normal analogue phone and it works fine, clear as a bell,
> but any outgoing or incoming calls to Asterisk are almost completely
> drowned out by loud crackling.
> 
> I've attempted to adjust the RX and TX gains, but to no avail.
There's
> also an echo, but only one way. I'm assuming this is a separate issue
so
> I've not done much to investigate that, but I may be wrong so if it is
> related does anyone have any suggestions?
> 
> I never had this trouble with ISDN, but then I wouldn't would I? :)
> 
> If anyone can wave a magic wand, or at the very least point me to a
> website where I can get my own magic wand, please let me know.
> 
> Thanks
> 
> Stuart
> 
> 
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users@lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users

I am currently trying to solve this problem aswell with a TDM400p card and
going out the FXO port to the PSTN ..
If anyone runs into a solution, would be great news.
T

On Sat, 9 Apr 2005, Stuart Ford wrote:
> Dear all ...
>
> I'm experiencing terrible trouble with crackling and noise on an
> analogue line connected to an X100P (compatible) card. I've checked the
> line with a normal analogue phone and it works fine, clear as a bell,
> but any outgoing or incoming calls to Asterisk are almost completely
> drowned out by loud crackling.
>
> I've attempted to adjust the RX and TX gains, but to no avail.
There's
> also an echo, but only one way. I'm assuming this is a separate issue
so
> I've not done much to investigate that, but I may be wrong so if it is
> related does anyone have any suggestions?
>
> I never had this trouble with ISDN, but then I wouldn't would I? :)
>
> If anyone can wave a magic wand, or at the very least point me to a
> website where I can get my own magic wand, please let me know.
>
> Thanks
>
> Stuart
>
>
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users@lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
>

> I'm experiencing terrible trouble with crackling and noise on an
> analogue line connected to an X100P (compatible) card. I've checked the
> line with a normal analogue phone and it works fine, clear as a bell,
> but any outgoing or incoming calls to Asterisk are almost completely
> drowned out by loud crackling.
> 
> I've attempted to adjust the RX and TX gains, but to no avail.
There's
> also an echo, but only one way. I'm assuming this is a separate issue
so
> I've not done much to investigate that, but I may be wrong so if it is
> related does anyone have any suggestions?
> 
> I never had this trouble with ISDN, but then I wouldn't would I? :)
> 
> If anyone can wave a magic wand, or at the very least point me to a
> website where I can get my own magic wand, please let me know.
What country are you in, and does the chipset on the compat card
support the telco standards in your country?

If the chipset doesn't match your telco standards, there is a high
probability you won't get rid of the echo. If it does match, then try
 echotraining=800
 echocancel=yes

Regarding the crackling noise, have you checked for shared
interrupts (cat /proc/interrupts)?

If you run "cat /proc/interrupts" every ten seconds, do you see
calculated interrupt values of about 1,000?

Go to /usr/src/zaptel directory and run
 ./zttest
Do you get something close to 100% over some period of time?

What version of asterisk are you running?