asterisk users - Aug 2005 - Ztmonitor values when zap channel is onhook

Hello,
In my quest to figure out the source of the random echo on our shiny new
asterisk install, I have been using ztmonitor on the TDM400p channels
for the good part of today.

I have 2 TDM400p cards with 8 FXO modules and 6 pots lines connected to
them (last 2 channels are unused but configured in zaptel). Even when
the lines are onhook, the Tx values settle down to 0 but the Rx values
still jump up and down. For some lines the values vary around 440, for
others around 250 and for one of the unused FXO ports, its around 97 all
the time.

With txgain/rxgain set to 0.0, call volumes were considerably low.
Hence, I have txgain set to 1.0 and rxgain set to 6.0.

I was wondering if the ztmonitor Rx: values were normal for what they
show, or are they too supposed to settle down to 0. If this is not
normal, does this indicate any problems with the pots lines?

--
VaibhaV

VaibhaV Sharma wrote:
> Hello,
> In my quest to figure out the source of the random echo on our shiny new
> asterisk install, I have been using ztmonitor on the TDM400p channels
> for the good part of today.
> 
> I have 2 TDM400p cards with 8 FXO modules and 6 pots lines connected to
> them (last 2 channels are unused but configured in zaptel). Even when
> the lines are onhook, the Tx values settle down to 0 but the Rx values
> still jump up and down. For some lines the values vary around 440, for
> others around 250 and for one of the unused FXO ports, its around 97 all
> the time.
> 
> With txgain/rxgain set to 0.0, call volumes were considerably low.
> Hence, I have txgain set to 1.0 and rxgain set to 6.0.
why not txgain=-6 to start out with?

On Fri, 2005-08-26 at 12:37 -0500, Eric Wieling aka ManxPower
wrote:
> VaibhaV Sharma wrote:
> > Hello,
> > I have 2 TDM400p cards with 8 FXO modules and 6 pots lines connected
to
> > them (last 2 channels are unused but configured in zaptel). Even when
> > the lines are onhook, the Tx values settle down to 0 but the Rx values
> > still jump up and down. For some lines the values vary around 440, for
> > others around 250 and for one of the unused FXO ports, its around 97
all
> > the time.
> > 
> > With txgain/rxgain set to 0.0, call volumes were considerably low.
> > Hence, I have txgain set to 1.0 and rxgain set to 6.0.
> 
> why not txgain=-6 to start out with?
With txgain set to 0.0, people on the other end complained about low
volume from our side hence I started out with a positive value.

Are the ztmonitor Rx: values of around 90 - 400 normal even when the zap
channel is Onhook or do I have some problem on the pots lines that I
should fix?

Thanks,

--
VaibhaV

Hello Asterisk friends,

Does somebody know few french phone numbers to do telco 1004Hz 0dBm signal
tests phone ?

Thanks in advance.

Best Regards,
Francois BERGERET,
Happy French Asterisk user  :-)

We just replaced our old system at work with Asterisk.  We use a TDM 
card with 3 FXO ports.  In tuning my gains, I discovered that the 
on-hook rx levels do in fact waver a little bit. Line 1 is right around 
145, Line 2 is around 235, Line 3 is around 380, and Line 4, which 
doesn't go to a POTS line but instead to a PhoneLabs Cell Socket thingy, 
is around 100.  These numbers sometimes spike upwards by 30% or so, but 
not too often.

So after feeling quite happy about the rx and txgain levels set at my 
workplace, I did the same steps at home, but in the process noted that 
my on-hook levels are closer to 3500.  They waver a bit, but not more 
than 30% it seems. This is on a X100P, which I've always suspected was 
sold to me mis-labeled (I think it's a clone instead of a real X100P).  
Also, I have a DAML (sometimes also called a concentrator?) installed 
outside my house, to split the copper lines coming to my house with 
neighbors. ( I live in a trailer court and personal copper pairs are at 
a premium I guess.  Had to switch away from 56k so long ago 'cause it 
wasn't 56k anymore...) but anyway the point is that the DAML might be 
causing the rx noise if it isn't my X10(0|1)P.

By way of summary, I feel based on my own experience that the numbers 
you are seeing while on-hook must be perfectly acceptable and well 
within normal, usable limits.  I think I'll order a real X100P or maybe 
a tdm with one FXO port to replace my junk and post back to the list 
with my results.

Moj