[asterisk-users] fxotune question

[John Morey]

I switch the wires in lines 5-8 (i.e. reversed tip and ring) and reran
fxotune to tune the lines.  fxotune.conf ended up looking exactly the same
as before the change.  Since I was expecting/hopping to see a change but did
not I switched everything back to the way it was. Is there a way to test the
lines, using a multi-meter maybe, to tell if the tip and ring are correct or
reversed?

After putting things back I reran fxotune to get the verbose output. It,
foxtune.out.gz, is attached.  fxotune seems to have had a better time with
line 7 during this run.  fxotune.conf now contains:

   5=7,255,251,251,2,255,255,1,255
   6=7,255,251,251,2,255,255,1,255
   7=4,0,0,0,0,0,0,0,0
   8=7,255,251,251,2,255,255,1,255
   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

I tried calling directly into the lines above and it seems lines 5,6,8 have
much more echo than lines 7,9,10. So just for fun I edited fxotune.conf to
the following and reloaded (fxotune -s) it:

   5=5,0,0,0,0,0,0,0,0
   6=5,0,0,0,0,0,0,0,0
   7=4,0,0,0,0,0,0,0,0
   8=5,0,0,0,0,0,0,0,0
   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

Unless I am just spacing out the echo on 5,6,8 seems less now.  I really
have no idea what is going on.

John


On Fri, Jun 6, 2008 at 1:31 PM, Matthew Fredrickson <creslin at digium.com>
wrote:

> John Morey wrote:
> > Tilghman,
> >
> > Thanks for the pointer.  I'll check this tomorrow and let you know.
>
> Also, I would like to see the output without the "-d" flag and with the
> "-v" flag.  This will output a lot of data (the echo ratio for every
> possible coefficient setting it has tried per port).
>
> Matthew Fredrickson
>
> > John
> >
> > On Wed, Jun 4, 2008 at 11:18 PM, Tilghman Lesher <
> > tilghman at mail.jeffandtilghman.com> 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.
> >>
> >> --
> >> Tilghman
> >>
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> >
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>
> --
> Matthew Fredrickson
> Software/Firmware Engineer
> Digium, Inc.
>
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