[Asterisk-Users] Terrible echo with Te110P and Adit 600

[Matt]

try sangoma card which has a very good echo cancel solution.

Best Regards

Matt
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----- Original Message ----- 
From: "Darren Wright" <dwright at d2-tech.com>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users at lists.digium.com>
Sent: Tuesday, October 18, 2005 9:43 PM
Subject: RE: [Asterisk-Users] Terrible echo with Te110P and Adit 600


>
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Kris
> Boutilier
> Sent: Wednesday, October 19, 2005 12:13 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: RE: [Asterisk-Users] Terrible echo with Te110P and Adit 600
>
> > -----Original Message-----
> > From: asterisk-users-bounces at lists.digium.com
> > [mailto:asterisk-users-bounces at lists.digium.com]On Behalf Of Darren
> Wright
> > Sent: Tuesday, October 18, 2005 7:42 PM
> > To: Asterisk Users Mailing List - Non-Commercial Discussion
> > Subject: [Asterisk-Users] Terrible echo with Te110P and Adit 600
> >
> > 8 POTS lines - Adit 600 - TE110P - Dell Precision 530 Dual
> > Xeon running 1.0.9 and 1.2 (tried both)
> >
> > The echo is insurmountable.  I have tried everything, and the
> > pots lines are clean.  If I go from an FXO on the Adit 600 straight to
> an FXS, I
> > get no echo from an analog phone.
>
> No echo that you can hear - remeber that echo relies on two things, a
> reflected signal and a delay between the transmission and the reception
> of the signal long enough for the brain to perceive it. Looping the
> channel bank will not introduce any delays. Passing through Asterisk
> will, by design.
>
> -----------------------
> I meant that if I take an incoming POTS line to the FXO port, map that
> to the FXS, and then make a call from the analog phone to the same
> person that I tried calling on the Cisco 7960, the echo on the 7960 is
> terrible, and the FXS port is just fine.
> ----------------------- 
>
> > I put an 128ms T1 echo canceller in between the adit and the
> > TE110P, and the echo was still horrible.
> >
> > I finally disabled the Zapata echo canceller....and WHAMMO!  It's
> > perfect now.
> >
>
> It sounds like something is confusing the zaptel canceller causing it to
> distort the signal. It seems to be very sensitive to signals that are
> too 'hot' (ie. too loud). Try lowering the gain on the signal going out
> of the channel bank into the T1. If it's too quiet try increasing the RX
> gain on the Zaptel side to compensate.
>
> ------------------------
> Agreed.  I've tried them lowered to the point that DTMF becomes an
> issue, and they have the volume pegged on the 7960's to even hear the
> callers.  I cannot adjust the TX/RX on the T1 coming out of the Adit
> 600.  I can adjust the FXO ports, as well as the TE110P.
>
> -------------------------
>
>
>
> {clip}
> > Any ideas so I don't have to spend $1000 on an echo canceller?
> >
>
> I provided the patches to 1.2 that formed the basis for the kb1 echo
> canceller, which is a derivative of the mark2 used in v1.0, and I still
> use a 64ms Tellabs hardware echo can as well as the zaptel echo
> canceller. Note that, in my case at least, the zaptel tends to handle
> those echos that leak through the Tellabs gear - such as acoustic room
> echos from speaker phones or cheap cordless handsets.
>
> If you need the echo issue resolved, stick with hardware cancellation.
> If you don't want to spend $1k, take a look at
> http://www.voip-info.org/wiki/view/Tellabs+Hardware+Echo+Cancellers.
> It's not everyones cup of tea, but it works fine for me which is why I
> shared it.
>
> The Zaptel echo can will be fixed so it performs predictably for
> everyone eventually, but until then go with 3rd party T1 gear if you
> want it reliably avoided.
> ------------------------
>
> Yup....got one running at home thanks to your WIKI.  But for clients
> moving forward, I need something a bit more mainstream.  I'm
> disappointed that the TE110P + adit 600 has been an issue on multiple
> systems now, and that the software echo canceller has been a major
> failure.
>
> It makes that solution WAY to expensive with the echo
> canceller....that's well into the 2k range, and a good FXO - SIP gateway
> with echo canceling is significantly less than that.
>
> Thanks for your help
>
> -Darren
>
>
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