ask your upstream.....
On Wed, 27 Apr 2005, Mark Johnson wrote:
Andrew Kohlsmith wrote:
Try these things:
Software:
- don't play with gains on PRI or T1 unless you have echo or too
loud/quiet. Static isn't caused by screwy gains and on digital circuits it
technically shouldn't ever need to be adjusted
- turn echocancel off for now
- I notice you've got span=1,0,0 -- if you're talking to the telco make
sure you're synchronizing the clock to them. Use span=1,1,0.
- remove all modules except those absolutely necessary
- Have you tried span 2, 3 or 4 instead of 1?
Also is this a *stock* kernel or some distro-"enhanced" version? Grab a
stock kernel of the same version from ftp.kernel.org.
Finally, don't use the agressive canceller unless you REALLY can't get rid
of it any other way (I seem to have very good performance with MARK2, using
the MMX-friendly implementation (zconfig.h) and making sure my CFLAGS for
the zaptel code was optimized for my processor (-march=pentium4).
Also see
http://lists.digium.com/pipermail/asterisk-users/2004-November/071301.html.
Hardware:
- *remove* the TDM22P from the system. Don't just unload the modules.
- pull the TE405P out and put it in another (not same motherboard) system.
I've seen this clean things up several times.
Wetware:
It's getting a little late for this now, but you paid for support from
Digium when you bought the card; You might want to give them a call.
Unfortunately I don't think this is an issue they will be able to solve
over the phone, and their likely recommendation would be to replace the
system. I'd love to know what they do find, if you try this route.
Again, my apologies, for blasting you; I had you mixed up with someone
else.
-A.
This is perfect stuff!!! Thank you!! I actually pulled the TDM22P today,
removed all of those drivers and get the same results. I have built another
box and am installing asterisk as we speak. I tried the span=1,1,0 with the
same results and have been running that line for a day now. What I find
strange is this... If I speak at a normal tone, it sounds OK. I still get
static noise when the other person speaks. If I talk louder, I start to get
what sounds like a partial echo. If I yell, I get a definite echo.
Have not tried a different slot on the quad, will try that tomorrow.
When monkeying with the echo cancel, I never really noticed a difference. I
would even reboot the machine between changes to see if it made a difference.
I am running this on Fedora Core 1. I will try any OS you recommend, but I
have always had great luck with RH type distro's. I keep 400 and 500 day
uptimes on those machines and they run many, many services. Uptimes would be
higher but it seems whenever I find a good place to work, they close up or I
move. Admittedly, I don't use RPM's for the core services, I typically
compile those myself. I also shut down every module and service I don't
need. I did alot of reading and it seemed like Digium cards were the real
deal and I also found many users that had luck with the same setup. Should I
try a different approach/OS/system?
Mark
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