[Asterisk-Users] Best quad-port fxo solution with EC?

[gw at adcomcorp.com]

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Rich
Adamson
Sent: Monday, February 13, 2006 2:21 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Best quad-port fxo solution with EC?


> > I am trying to figure out which way to go for a quad port fxo 
> > solution with a good echo can on it.  My options are the sangoma 
> > remora, a mediatrix fxo, or something similar.
> > 
> > The issue is that I would need a good EC.  This would be on about a 
> > 9000 foot loop, and the lines don't function well on a spa-3000 or 
> > zaptel tdm
> > 4 port card.
> > 
> > Anyone have experience that drives them in a certain direction when 
> > considering a good ec on a quad port?
> > 
> > I tried this also with some fxo clones, but echo killed it.
> 
> The nearest CO my POTS line goes to is 11 miles away.  My POTS line 
> works when plugged into my TDM400P FXO port.  I DID have to fiddle 
> with the gains a bit and I still have to get rid of the last of the 
> echo, but overall it seems to work well.

Are you sure the telco is not using fiber-extended line modules?
- Not certain.

Have you measured the loss from their milliwatt generator?
- Yes, results were way off, unless I did it wrong, my gains should be
about -2 on a fttp line but the measurements suggest about +7

(The numbers would be very interesting to see since a large number of
spa3k and tdm04 users at that distance have significant EC issues.)

- I'll post when I get more details...

Greg
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