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

[Chad Osmond]

The value of 14800 is correct.
I had issues with my TDM400p with 2x FXO's installed and using the Xlite client. I could not get the echo stable at the initial call.

Changing to a hard phone made everything work correctly. I still had problems with the off location I called, but mostly worked great.

To see the TX gain I created an extension with the Milliwatt command attached to it and called it from the PSTN, then on a second line I called the milliwatt line at my CO and compared the volumes by ear (instead of looping around) and it worked great.

Chad 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Ken Dresdell
Sent: August 16, 2005 9:55 AM
To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
Subject: RE: [Asterisk-Users] Echo calibration with ztmonitor and a testlinefrom a telco

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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