asterisk users - Feb 2008 - Customer complains of noise on line I cannot reproduce.

I have setup a few Asterisk systems for customers using Digium TDM400 cards
and Aastra phones. No problems with sound quality at all except at this one
site.

Every time I try their system I don't hear any problems but they tell me
that it is really bad. They describe it a a loud scratching sound.

Are there any tests that can be done to pinpoint the problem? Has anyone
seen this before? Are there known causes for this?

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Open Source: To innovate then create
Proprietary: To imitate then litigate
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Royce Souther wrote:
>
>
> Are there any tests that can be done to pinpoint the problem? 
Swap out the card - that usually fixes anything you have control over.

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Check for IRQ issues, move the card to a different slot.

You could ask permission to record calls so maybe you can hear the
sound yourself.

I would then go ahead and swap out cards.  I have had TDM400 with bad
modules and also bad ports on the cards themselves, so it could a
hardware issue.

This is what I suspect, especially if you did not put any surge
suppression on your telco lines.  Usually, at least in my experience,
ticks or beeps indicate IRQ, hissing or loud static indicate something
with/on the board is bad.  ALWAYS use surge suppression on your lines!

Thanks,
Steve Totaro

On Wed, Feb 27, 2008 at 11:36 AM, Royce Souther <osgnuru at gmail.com>
wrote:
> I have setup a few Asterisk systems for customers using Digium TDM400 cards
> and Aastra phones. No problems with sound quality at all except at this one
> site.
>
> Every time I try their system I don't hear any problems but they tell
me
> that it is really bad. They describe it a a loud scratching sound.
>
> Are there any tests that can be done to pinpoint the problem? Has anyone
> seen this before? Are there known causes for this?
>
> --
> Open Source: To innovate then create
> Proprietary: To imitate then litigate
> _______________________________________________
>  -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
>  asterisk-users mailing list
>  To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
>

On Wed, 27 Feb 2008, Royce Souther wrote:
> I have setup a few Asterisk systems for customers using Digium TDM400 cards
> and Aastra phones. No problems with sound quality at all except at this one
> site.
>
> Every time I try their system I don't hear any problems but they tell
me
> that it is really bad. They describe it a a loud scratching sound.
>
> Are there any tests that can be done to pinpoint the problem? Has anyone
> seen this before? Are there known causes for this?
One known casue that tripped me up recently - I'm getting old. Customer 
complained of a whistle in the headset of a GXP2000 after hanging up a 
call... I coudn't hear it, but the others in the office could - most of 
them were much younger than me )-:

Gordon

Perhaps irq sharing?

Royce Souther schreef:
> I have setup a few Asterisk systems for customers using Digium TDM400 
> cards and Aastra phones. No problems with sound quality at all except 
> at this one site.
>
> Every time I try their system I don't hear any problems but they tell 
> me that it is really bad. They describe it a a loud scratching sound.
>
> Are there any tests that can be done to pinpoint the problem? Has 
> anyone seen this before? Are there known causes for this?
>
> -- 
> Open Source: To innovate then create
> Proprietary: To imitate then litigate
> ------------------------------------------------------------------------
>
> _______________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users

have you compiled ztdummy module? Try to remove ztdummy from you system (in
/etc/default zaptel comment ztdummy module)
We need to see what happens if zaptel hardware provide the clock, If it is
the case you will see a line like that:

oot at ttyp0[~]# cat /proc/zaptel/*
Span 1: WCTDM/0 "Wildcard TDM400P REV I Board 1" (MASTER)



root at ttyp0[~]#



2008/3/9, Royce Souther <osgnuru at gmail.com>:
>
> Not sure what you are asking for here? It looks like you have a config
> file that sets a clock speed but I do not know what file that is.
>
> How can I find this informaiton?
>
> On Sat, Mar 8, 2008 at 5:48 PM, Fons van der Beek <
> fons.vanderbeek at 84-it.com> wrote:
>
> > what clock?
> > rxclock
> > crystalclock
> >
> >
> > I currently use
> >
> > "card=1,0x4"
> >
>
> --
> http://www.Radados.org
> _______________________________________________
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