[asterisk-users] fxotune question

[John Morey]

Drew,

I'm also getting complaints of static.  Well actually I've complained about
it myself and have asked them to have AT&T check the lines just to make sure
the problem is not on that side.

John

On Thu, Jun 5, 2008 at 10:17 AM, Drew Gibson <drew at oanda.com> wrote:

> Tilghman Lesher wrote:
> > On Wednesday 04 June 2008 22:02:19 John Morey wrote:
> >
> >> Hello,
> >>
> >> I've run fxotune at different times but continue to get what seem to be
> >> strange numbers in /etc/fxotune.conf.  It ends up with:
> >>
> >>     5=7,255,251,251,2,255,255,1,255
> >>     6=7,255,251,251,2,255,255,1,255
> >>     7=7,255,251,251,2,255,255,1,255
> >>     8=9,2,250,253,4,252,0,255,255
> >>     9=4,0,0,0,0,0,0,0,0
> >>     10=5,0,0,0,0,0,0,0,0
> >>     11=0,0,0,0,0,0,0,0,0
> >>     12=0,0,0,0,0,0,0,0,0
> >> ports 5-10 have lines hooked up to them.  The first four lines seem
> strange
> >> when compaired to what others have posted and what ports 9 and 10 have.
> >>
> >> Also if I'm reading things right my echo ratios seem to be very
> >> high.  Running "fxotune -d -b 5 -w 1004" gives the following:
> >>     Dumping module /dev/zap/5
> >>     echo ratio = 0.1759 (1960.0 / 11145.0)
> >> Which I read to be over 17%.  This seems crazy.  Am I reading this
> right?
> >> Where should I start to look for problems?
> >>
> >
> > You might check to see if the tip and ring are reversed in your wiring.
>  That
> > can frequently cause weird echo problems.
> >
> >
>
> Which ports would you expect to be reversed? 5-8 or 9-10?
>
> I have similar settings in my fxotune.conf for a TDM2400P and I'm
> getting complaints of "static" on the line that I suspect are related to
> an overtaxed h/w echo canceller
>
> My fxotune.conf:-
>
> 13=7,255,251,251,2,255,255,1,255
> 14=9,254,251,255,2,0,1,0,0
> 15=9,254,251,255,2,0,1,0,0
> 16=5,0,0,0,0,0,0,0,0
> 17=9,254,251,255,2,0,1,0,0
> 18=9,254,251,255,2,0,1,0,0
> 19=9,254,251,255,2,0,1,0,0
> 20=9,254,251,255,2,0,1,0,0
> 21=9,254,251,255,2,0,1,0,0
> 22=9,254,251,255,2,0,1,0,0
> 23=9,254,251,255,2,0,1,0,0
> 24=9,254,251,255,2,0,1,0,0
>
> regards,
>
> Drew
>
> --
> Drew Gibson
>
> Systems Administrator
> OANDA Corporation
> www.oanda.com
>
>
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