[Asterisk-Users] Echo calibration with ztmonitor and a test linefrom a telco

[Ken Dresdell]

Thanks for your help,

I have already seen this page but since the head version of ztmonitor is
able to show the real number value of the rx and tx (ztmonito  -vv), I
was thinking that maybe someone could confirm to which value we want the
rx of ztmonitor  when we try to calibrate the system with a test line
from a Telco and a TDM card.

The only information that I have found is that I have to setup my rxgain
to get a 14800 value with ztmonitor but that is not working.

Any others suggestions ?

Regards

Ken


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Dan
Littlejohn
Sent: 15 août 2005 15:42
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Echo calibration with ztmonitor and a test
linefrom a telco

On 8/15/05, Ken Dresdell <kdresdell at globetrotter.net> wrote:
> Hello everyone,
> 
> Does anyone have experience with echo calibration for TDM card with
> rxgain and txgain (Zapata.conf) and ztmonitor (CVS Head)?
> 
> I have found very few information about it and what I have found makes
> me confused. I have a phone number provided by my TelCo(1004 hz at
0db)
> and from what I saw, I am supposed to calibrate my rxgain to get a
14800
> value with ztmonitor .
> 
> Here is the information I found:
> 
> 
>
http://lists.digium.com/pipermail/asterisk-users/2004-November/071301.ht
> ml
> 
> 
> Does anyone have successfully reduced echo with this procedure?
> 
> My main problem is that when I get 14800 with ztmonitor, I have now a
> rxgain=14 and it seem to be too high for asterisk and I cannot dial
out
> anymore.
> 
> Any suggestions?
> 
> 
> Thanks in advance for your pointers
> 
> Regards
> 
> Ken
> 
> 
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I have been doing a bit of this too lately.  This was also useful.

http://www.asteriskdocs.org/modules/tinycontent/content/docbook/current/
docs-html/x1695.html

Dan
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