[Asterisk-Users] TE411P Really Bad Echo

[chip at innovates.com]

I can definitely vouch for Sangoma’s cards with hardware echo
cancel.  I’ve been installing Asterisk boxes for about 6
months now using Digium TDM cards and Sipura SPA-3000s in
small installations.  This past month I installed in a small
office with 3 pots lines.  The echo was very bad and of
course the phone company (SBC) claims the lines pass all
tests.  I exhausted all the echo cancel combinations in
zaptel and still had echo and bad noise during double talk. 
I installed a Sangoma A200 with hardware echo cancel and you
would never know there was a problem. It’s the best sounding
connection I’ve heard through Asterisk.

Chip Schweiss


-----Original Message-----
From: asterisk [mailto:asterisk at oneringnetworks.com] 
Sent: Friday, February 10, 2006 10:35 PM
To: asterisk-users
Subject: Re: [Asterisk-Users] TE411P Really Bad Echo

It was Digium's opinion that perhaps the card had a VPM.  We
got a replacement TE411P, I implemented it tonight and still
the exact same echo problem.  At this point I feel like I can
rule out failed hardware.  

I contacted Digium support and now they are telling me it's
something with my carrier, and I should call them.  I called
Bellsouth, and they ran a full stress test on the circuit
taking me offline for about 30 minutes.  

The end result is that the circuit test passed with no
errors.  Bellsouth says it's not in their network, Digium
says its not their card, and I have a te411p with VPM
disabled in the wct4xx kernel module because something
doesn't work the way it should.  My customer is wanting to
know about sangoma cards with the echo cancellation, and at
this point I'm nervous to recommend any hardware.  I'm going
to look into the sangoma that you suggested.  Are there any
other kinds of products that I could look into either Passive
or Active.

Thanks 

Stagg Shelton
www.oneringnetworks.com


Matt wrote: 
try sangoma carrier grade 104d hardware EC card. we're using
it ourself.

Best Regards

Matt
----- Original Message ----- 
From: "Anthony Rodgers" <Anthony_Rodgers at dnv.org>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users at lists.digium.com>
Sent: Tuesday, February 07, 2006 12:57 PM
Subject: Re: [Asterisk-Users] TE411P Really Bad Echo


  
For what it's worth, we have been going through very similar
issues
with a TE411P - with Digium support, we have basically gone
as far as
we can with the HW EC, and are now using MG2 with much better
results.

We have a Ditech EC box on order.....

Regards,
-- 
Anthony Rodgers
Business Systems Analyst
District of North Vancouver
Web: http://www.dnv.org
RSS Feed: http://www.dnv.org/rss.asp


On Feb 7, 2006, at 7:36 AM, Matthew Fredrickson wrote:

    
On Feb 5, 2006, at 9:36 PM, Stagg Shelton wrote:

      
I just implemented a system using a TE411P hardware echo
cancellation
card. Per Digium, I setup zaptel.conf, and zapata.conf the
same way
        
as
      
I always have. To my surprise calls out to the PSTN had a
terrible
echo. 1 - 2 second delay, and quite clear. The echo was so
bad that
        
I
      
had to remove the hardware echo cancellation module from the
card.
        
We
      
are only using the 1st span of this card right now, and we have a
tdm400p with 4 fxs modules installed as well.

If anyone has experience with this card, can you tell me if I am
missing
something.
        

1 to 2 seconds?! That's ridiculously huge. I don't think
you'll find
a echo canceler anywhere that can fix your echo problem. If
it gets
better with the VPM disabled, then definitely contact Digium
tech-support about it.

Matthew Fredrickson

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