[asterisk-users] fxotune question

[John Morey]

The zaptel version is SVN-branch-1.4-r4257


On Thu, Jun 5, 2008 at 2:57 AM, Tzafrir Cohen <tzafrir.cohen at xorcom.com>
wrote:

> On Wed, Jun 04, 2008 at 11:02:19PM -0400, John Morey wrote:
> > Hello,
> >
> > I've run fxotune
>
> Of which zaptel version, exactly?
>
> > 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.
>
> fxotune works by setting the values of some specific registers in a
> specific chip used for the FXO adapters. In the "set" mode (-s) it
> merely takes a set of values from /etc/fxotune.conf and applies them to
> the chips of the Zaptel device in the respective ports.
>
> In the "tuning" mode (-i or -d) it will attempt to find the best set of
> register values for your ports. It does that basically by systematically
> applying many possible sets and and checking the echo level with it.
>
> If nothing is connected to the port, no set of value is better than the
> default values (all zeros), and hence those will remain.
>
> >
> > 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?
>
> An echo canceller is still generally useful for an FXO adapter.
>
> --
>               Tzafrir Cohen
> icq#16849755              jabber:tzafrir.cohen at xorcom.com<jabber%3Atzafrir.cohen at xorcom.com>
> +972-50-7952406           mailto:tzafrir.cohen at xorcom.com
> http://www.xorcom.com  iax:guest at local.xorcom.com/tzafrir
>
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