[Asterisk-Users] Effectively using a telco Type 102 Milliwatt Test line with ztmon itor -v to set txgain/rxgain in zapata?

[canuck15]

> I am trying to obtain optimum gain settings for a bank of analog lines
> connected to a channel bank. My telco has provided a 'Type 102' test line
to
> use for incoming level calibration. This is functionally equivalent to app
> Milliwatt(), but provides tone from the CO inwards.
> 
> Question is, how should one use this a 0dbm test source with ztmonitor? Am
I
> correct in understanding that a 0dbm level should provide a 100% drive in
> the level monitor, not a 50% drive as is otherwise 'optimum' for regular
> voice traffic? 

Yes, that is correct.  the 0dbm level should provide 100% drive in the level
monitor.  Actually, I found it to be more than 100%. The grahical display
was at 100% but the quantative reading only read about 6000.  I needed to
add a couple db to the rx gain to get it to around 14500.  It you are
running Asterisk v1.0.9 you only need to edit one line in your
usr/src/zaptel/ztmonitor.c file and then recompile the zaptel driver.
 
Change line 261
 
fprintf(stderr, "Usage: ztmonitor <channel num> [-v] [-f FILE]\n");

 
to
 
fprintf(stderr, "Usage: ztmonitor <channel num> [-v | -f FILE]\n");
 
Recompile
 
cd /usr/src/zaptel
make && make install
 
Run ztmonitor in verbose mode
 
/ztmonitor 1 -vv
and you should see RX and TX levels in number form on the right hand side
 
 


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