[Asterisk-Users] TE411P Really Bad Echo

[Stagg Shelton]

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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