[Asterisk-Users] TE411P Really Bad Echo

[Cory Andrews]

Stagg - I know you get a full 128ms tail of echo can on the Sangoma.  I believe that on the TE411P, the 128ms tail is shared by all (4) spans, and as you add additional spans up to maximum of 4, the echo can tail amount decreases accordingly.  If you are running 4 spans, you have 32ms of echo can tail on each span, not the full 128ms.

Now that I'm reading back through your post thread, it looks like you were only running 1 span on the TE411P, so you should have been getting the full 128ms of echo can tail.  You may not find an improvement with the Sangoma.  I have never experience, nor heard of a 1-2 full second delay.  Trial and error is likely your course of action.  

Cory J Andrews
++++++++++++
VOIPSupply.com
454 Sonwil Drive
Buffalo, NY 14225
++++++++++++++
voice - 716.630.1555 X22
email - Cory at VOIPSupply.com
AIM - B2CORY
  ----- Original Message ----- 
  From: Stagg Shelton 
  To: Asterisk Users Mailing List - Non-Commercial Discussion 
  Sent: Friday, February 10, 2006 11:34 PM
  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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