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

[Ed Rubright]

The next question for me is: How do I found out my telco milliwatt test
number?  I'm in Washington State using Qwest.

The way I understand this, I'm to dialup the telco milliwatt test number and
adjust the rxgain values using ztmonitor tool until the "Max Audio Hit" is
in the middle of the bar graph for a normal conversation?

Thanks,
Ed

-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com] On Behalf Of Rich Adamson
Sent: Monday, April 19, 2004 9:01 AM
To: asterisk-users at lists.digium.com
Subject: RE: [Asterisk-Users] Intel 536ep as a FXO?

> 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


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