[Asterisk-Users] TDM-400P Sound Quality issues

[Paul Fielding]

> Pure guess... you're probably bumping into some of the same issues
> that many of us TDM users are hitting. Seems like either an interrupt
> handling (latency) or pci bus issue. You'll find hundreds of postings
> relative to this over the last six months or so. Not everyone has
> problems with the TDM, but some have found that swapping motherboards
> does clear up the issue.

I did a bunch of searching through the list, found lots of messages 
regarding misc. TDM400p problems, but none that sounded like the issue I'm 
seeing.  Can anyone point me to any discussions regarding this?

The thing that I find so odd about it is that the sound quality only 
degrades on the zap channel when I'm connecting from a *remote* SIP client, 
but on local network the zap channel sounds fine (see description below).

I'm willing to get  a different MB if that's really the fix, but I'd hate to 
go through the work and $$ to make that happen only to find that the problem 
doesn't go away...

Paul

----- Original Message ----- 
From: "Rich Adamson" <radamson at routers.com>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at lists.digium.com>
Sent: Sunday, February 13, 2005 9:12 PM
Subject: Re: [Asterisk-Users] TDM-400P Sound Quality issues


>
>> I spent a bunch of time troubleshooting the SIP end of things, thinking 
>> that's where the
> problem was, until I realized that every other SIP
>> connection I make (from remote) yields a high quality call.  ie.  I can 
>> dial another SIP
> client and maintain high quality audio.  Additionally, I can
>> dial an extension that not only SIP connects to my server, but from there 
>> goes out an IAX2
> connection to another remote Asterisk server, from
>> there to another SIP client, and the audio quality is excellent.
>>
>> Therefore, I don't think the audio issue I'm experiencing is on the SIP 
>> end.
>>
>> Are there some wierd SIP -> ZAP timing / conversion / other issues that 
>> could be causing this?
>>
>> thoughts?
>
> Pure guess... you're probably bumping into some of the same issues
> that many of us TDM users are hitting. Seems like either an interrupt
> handling (latency) or pci bus issue. You'll find hundreds of postings
> relative to this over the last six months or so. Not everyone has
> problems with the TDM, but some have found that swapping motherboards
> does clear up the issue.
>
> Processor speed and ram have nothing to do with it, nor does single vs
> dual processors, etc.
>
> Several people have opened trouble tickets with digium, but seems all
> have gone into a black hole (thus far).
>
>
>
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