<br><font size=2><tt>asterisk-users-bounces@lists.digium.com wrote on 10/12/2005
01:23:57 PM:<br>
<br>
> On Wed, Oct 12, 2005 at 12:05:32PM -0400, tmassey@obscorp.com wrote:<br>
> > I am in the middle of trying to get a milliwatt test line to
calibrate the <br>
> > rxgain properly. However, this won't help me with the txgain,
will it? <br>
> > How can I properly calibrate the txgain? By ear? Or
is there a more <br>
> > scientific method?<br>
</tt></font>
<br><font size=2><tt>> I contacted Rhino to see if they had any suggestions,
and they were<br>
> able to give me a few. What finally worked was setting the Asterisk
gains<br>
> back to 0 for all channels, then adjusting the gains down on the channel
banks<br>
> themselves for the phone (FXS) interfaces only. A huge improvement!
My<br>
> current adjustements are the following:<br>
</tt></font>
<br><font size=2><tt>According to the company that installed the channel
bank, there is a 0db and -10db setting on the smart jack for the T1. They
claim that this was most likely set to -10db by the ILEC when the T1 was
installed, and that would be causing the low audio volume.</tt></font>
<br>
<br><font size=2><tt>Does this make sense to anyone? Wouldn't the
-10db affect the *digital* levels, not the analog waveform encoded within
the digital signal?</tt></font>
<br>
<br><font size=2><tt>I'm still trying to get a milliwatt test line to calibrate
from. They claim that they won't give that out to end users because
"it could fry the T1 card". Sigh.</tt></font>
<br>
<br><font size=2><tt>Tim Massey</tt></font>
<br>