[Asterisk-Users] TE411P Really Bad Echo

Fri Feb 10 22:03:30 MST 2006

Try Sangoma, I believe you can try it and return it within 30 days for a
full refund.

Thanks,
Steve Totaro
http://www.asteriskhelpdesk.com

  _____  

From: Cory Andrews [mailto:Cory at VOIPSupply.com] 
Sent: Friday, February 10, 2006 11:52 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] TE411P Really Bad Echo

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 <mailto:Cory at VOIPSupply.com> 
AIM - B2CORY

	----- Original Message ----- 

	From: Stagg Shelton <mailto:asterisk at oneringnetworks.com>  

	To: Asterisk Users Mailing List - Non-Commercial Discussion
<mailto:asterisk-users at lists.digium.com>  

	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 <http://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>
<mailto:Anthony_Rodgers at dnv.org> 
	To: "Asterisk Users Mailing List - Non-Commercial Discussion"
	<asterisk-users at lists.digium.com>
<mailto: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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