[Asterisk-Users] Intel 536ep as a FXO?

[Tom]

At 11:01 AM 4/19/2004, you wrote:
> > I for one would love this.  I do not have any test equipment to
> > determine the level I am sending at, but if I could at least figure out
> > what levels to have my rxgain values set to, that would help.
> >
> > I remember seeing somewhere that you can use a program (part of the zt
> > suite if I remember correctly) to view the audio levels on the FXO card
> > like an on-screen vu meter.  I can use that and dial up my telco
> > milliwatt test number and adjust accordingly.  I asked where that tool
> > was on the IRC channel, but they seemed to not know either.  I have
> > searched as I know I saw it, but can't find it again.
>
>The tool you're looking for is /usr/src/zaptel/ztmonitor
>
>[root at phoenix zaptel]# ./ztmonitor
>Usage: ztmonitor <channel num> [-v] [-f FILE]
>
>[root at phoenix zaptel]# ./ztmonitor 1 -v
>
>Visual Audio Levels.
>--------------------
>  Use zapata.conf file to adjust the gains if needed.
>
>( # = Audio Level  * = Max Audio Hit )
><----------------(RX)----------------> <----------------(TX)---------------->
>  ##################*
>
>Keep in mind that tool is nothing more then an audio VU meter and was
>not intended to be an accurate means of measuring transmission levels.
>I think bkw (probably with Mark) wrote it back in the November/December
>timeframe as a simple tool for adjusting rxgain, etc. About that same
>time, the echo cancelling mechanism (for the x100p) was rewritten to
>"sense" the audio reflection (or echo) during the first half-second or
>so of an initial pstn call. (That was a substantial improvement over
>previous cancellation methods without a doubt. If I recall recorrectly,
>that mechanism was reduced to sending an outbound short duration pulse
>or burst, and measuring the reflected energy. Sort of a snapshot at the
>start of an analog call. It's okay, but certainly not the equivalent
>of commercial analog cancellation products including mux's.)
>
>I've not had to revisit the x100p gain adjustment effort for several
>months, but seems to me that it was necessary to completely stop and
>start * each time an adjustment was made to the rxgain/txgain settings
>in zapata.conf (a simple reload wasn't adequate).
>
>Rich

Is this where the audio level bar should we be with the 0dB milliwatt test 
tone?

The graph below was done with a -14 on the rxgain.

Visual Audio Levels.
--------------------
  Use zapata.conf file to adjust the gains if needed.

( # = Audio Level  * = Max Audio Hit )
<----------------(RX)----------------> <----------------(TX)---------------->
  ##################*

Thanks,

Tom