[Asterisk-Users] Adit 600 and echo

[gw at adcomcorp.com]

See my other post.  I had the exact same problem on about 5 lines. 

I got a tellabs ec a while back, and then a power supply but hadn't the
time to solder it up and get things going...I had just been forwarding
the inbound calls to voicepulse connect.

I finally did get it soldered and ready, and when I installed the new
hardware tellabs ec, echo was gone.  I must have spent 10-20 hours on
this problem, and the tellabs solved it in 5 minutes (once setting the
channel properties to FXO-LS & FXS-LS)

I think it cost something like $110 for the card, and $86 for the power
supply.  Then you need the time to do the soldering.  

In my case, being far from the CO, I found no other solution than the
hardware EC.  You do need some soldering experience though, because you
don't want to lift pads off the board(something I had fun with dealing
with SMD's and such).

I can say though, that the resulting quality of the line is so decent, I
am highly considering using the POTS for outgoing instead of iax
connections to ITSP's (because I don't like latency).

It really is an impressive difference.

If you have 13 lines, I am surprised you are using a channel bank (if
they are pots lines).  Wouldn't it be more cost effective to use a T1
from your CO?

Ztmonitor or a good tool, but in my experience just not enough when you
are on a distant loop.  I went through milliwatt tests like crazy trying
to tweak gains, with little luck.

In the end, the $200 or so I spent on hardware was totally worth it...

If you are not interested in doing the soldering, you can probably find
someone on the list who can supply you with a working EC setup....

You're welcome to call me if you want to discuss what I went through...

Office: 1-914-591-2211
Mobile: 1-914-582-9110

Regards,
Greg

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Doug Lytle
Sent: Thursday, January 12, 2006 11:25 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [Asterisk-Users] Adit 600 and echo

I'm having issues with echo.

My setup is Polycom IP501 phones connected to an Adit 600 via T100P.  13
Lines going to the Adit.

All echo so far is on the local side (Employees hears own voice, but
only on some calls).

Watching the channel with ztmonitor, I notice that TXGAIN is pegged out
most of the time.  RXGAIN is anywhere between 45 and 60%.

Is it safe to assume that playing around with the TX/RX gains on the
channel bank will not do anything and this needs to be resolved via the
TX gains within Asterisk?

I was able to set the TXGAIN to -6.3 and it did help some, but if I try
-6.4 or more on any of the channels, I can no longer here audio when
calling into the facility. 

Any suggestions?

Doug

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