[Asterisk-Users] An anniversary and a lament for FXOs

[Dave Henderson]

Hi Michael,

You mention the X100P -- I agree, it's not a great card.  I've had all
sorts of issues with mine, though I've lived with it for one of my
not-so-important Asterisk PBXes.

One device it seems you haven't tried is the Digium TDM400P with an FXO
module...  I've used a pile of these, and have generally been very
pleased with them.

--
Dave Henderson
Customer Service Manager
The IT Department, Inc.

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of
mgraves at mstvp.com
Sent: November 3, 2004 10:14 AM
To: Asterisk Group
Subject: [Asterisk-Users] An anniversary and a lament for FXOs

This week marks one year since I first setup an Asterisk server in the
hopes of transitioning my home office to a total VoIP system. The
process has been an incredible learning experience. I've tried numerous
IP hard phones, eventually settling upon the Polycom IP600 as my choice.
I've also used multiple ATAs including all the Sipura products.
Using Asterisk has been a challenge, a thrill and (when its working) a
joy. However, the one thing that I am not satisfied with is the
performance of the FXO interfaces that bring in my PSTN lines.

I've tried X100p cards but found them horribly unreliable. I presently
use Sipura SPA-3000s but they're only marginally better. How is it that
my Panasonic 4 line SOHO phone system (KX-TG4000B) can have four stable,
reliable FXOs with no echo at all in a device with a total cost of
<$500? It seems to me that there ought to be hardware available that
behaves just as well, but bridges the PSTN to the SIP/IAX domain?

I've read a lot on the list about how difficult designing FXOs can be,
but that flies in the face of the fact that every small multi-line phone
system has them...and without expection those behave better than the
devices I've been able to try with Asterisk. The Sipura SPA-3000 has
several settings to adjust for line impedance and inductive/capacitive
line loading....lots of settings, but it provides nowhere near the basic
performance of one of the lines on the Panasonic KSU. It's simply mind
boggling.

So, while I've posted with respect to FXOs previously, I must ask
again....what FXO interface device can anyone recommend from real
experience?

Michael

P.S.  -  I even investigated switching my lines to ISDN to get around
the need for FXOs, but SBC won't do it where I live.
--
Michael Graves                           mgraves at pixelpower.com
Sr. Product Specialist                          www.pixelpower.com
Pixel Power Inc.                                 mgraves at mstvp.com

o713-861-4005
o800-905-6412
c713-201-1262




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