asterisk users - Jan 2007 - TDM2400 Hardware Echo Cancel

Good Day List,

I'm having some issues with echo cancel on my Asterisk box, and have
done
extensive reading and have gained some useful pointers from this list
but have a couple of hopefully fairly simple questions.
The Asterisk box is connected via 20 FXO ports on a TDM2400 with the 
Hardware echo cancel module.  Echo cancel almost works, but the users
hear 
what they describe as a 'crackle' coming back when they talk. 

I want to tune to echo canceller, but am unsure if any of the options 
provided have any effect on the hardware module.  Do the settings such
as 
echocancel and echotraining in Zapata.conf affect the hardware module?  

Would I be better removing the hardware module and tuning the software
echo 
canceller?

The asterisk box is currently running 1.2.13, with zaptel 1.2.  Would
you 
advise upgrading to the newer Zaptel drivers?  I don't want to upgrade 
Asterisk itself just yet.

Any help or pointers to documentation regarding the hardware echo cancel
module would be greatly appreciated,


Thanks,



Adam Sharples

Adam Sharples wrote:
> I want to tune to echo canceller, but am unsure if any of the options 
> provided have any effect on the hardware module.  Do the settings such
> as 
> echocancel and echotraining in Zapata.conf affect the hardware module?  
No. Hardware echo cancelers on Digium cards are either 'on' or
'off',
there are no tuning parameters.

Hi
> Echo cancel almost works, but the users
> hear 
> what they describe as a 'crackle' coming back when they talk. 
>   
Just a thought, but check that your gain levels are not too high?

Ed

I have been having the same problems since installing a TDM2400 with
hardware echo canceller.  The best way to describe the sound is a
background crackle or hiss that just can't be filtered out.
Increasing the RX gain just makes the problem worse.
SIP to SIP calls are flawless.

An acquaintance told me the analog line level is too low, but when
plugging a regular phone into the line, the signal is plenty loud
enough.
I am curious if anyone else had similar issues with the TDM2400 card and
if they have resolved it.

--
Andrew
> -----Original Message-----
> From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-
> bounces@lists.digium.com] On Behalf Of Adam Sharples
> Sent: Tuesday, January 16, 2007 09:00
> To: asterisk-users@lists.digium.com
> Subject: [asterisk-users] TDM2400 Hardware Echo Cancel
> 
> Good Day List,
> 
> I'm having some issues with echo cancel on my Asterisk box, and have
> done
> extensive reading and have gained some useful pointers from this list
> but have a couple of hopefully fairly simple questions.
> The Asterisk box is connected via 20 FXO ports on a TDM2400 with the
> Hardware echo cancel module.  Echo cancel almost works, but the users
> hear
> what they describe as a 'crackle' coming back when they talk.
> 
> I want to tune to echo canceller, but am unsure if any of the options
> provided have any effect on the hardware module.  Do the settings such
> as
> echocancel and echotraining in Zapata.conf affect the hardware module?
> 
> Would I be better removing the hardware module and tuning the software
> echo
> canceller?
> 
> The asterisk box is currently running 1.2.13, with zaptel 1.2.  Would
> you
> advise upgrading to the newer Zaptel drivers?  I don't want to upgrade
> Asterisk itself just yet.
> 
> Any help or pointers to documentation regarding the hardware echo
cancel
> module would be greatly appreciated,
> 
> 
> Thanks,
> 
> 
> 
> Adam Sharples
> 
> 
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Hi,

 

 

I had the same "crackle" problem with the same hardware.

Actually for me was a shared IRQ problem.

 

Now that I fixed it the situation is much better (maybe not perfect but
anyway good).

 

Maybe this IRQ are affecting more the Echo Module than the card?

 

Ciao

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