[Asterisk-Users] echo / delay problem

[Mikael Magnusson]

On Sat, Mar 19, 2005 at 09:22:22AM -0600, Rich Adamson wrote:
> 
> > > If you are outside the US, there isn't much you can do since the x100p
> > > card was specifically designed to operate with US 600 ohm impedance
> > > pstn lines.
> > > 
> > > If you have a x100p clone, it is likely the problem. Replace it with
> > > something capable of matching the pstn impedance for whatever country
> > > you are located in.
> > > 
> > 
> > Loading wcfxo with option opermode=1 should select CTR21 mode, which
> > according to wcfxo.c (in zaptel) should be used in Austria, Belgium,
> > Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
> > Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland,
> > and UK. The default is to use FCC mode, which is used in the US.
> 
> The x100p does not have a programable chipset for impedance matching.
> That parameter was intended for the TDM card.
>

Ok, maybe it isn't programmable, but there seems to be two different
DAA's used in the clones[1]. Si3012 for the US market and Si3014 for the
global market. I assume this has to do with the line interface. I
bought a clone in Sweden that has the Si3014. It should support the line
impedance used in Sweden I think, since it's marked with the following label:

  Clas Ohlson AB
  Modell/Malli: AMI-IE92 Art.nr/nro:32-2055
  CE
  For use in Sweden, Norway and Finland.
  To be connected to the public switched telefone network.
  Hereby, Clas Ohlson, declares that this modem is in
  complience with the essential requirements and other
  relevant provisions of Directive 1999/5/EC.

[1]http://www.intel.com/design/modems/linecard.htm

Regards
Mikael Magnusson