[asterisk-users] sangoma card rx/tx gain level

[cb]

On Apr 15, 2011, at 12:50 PM, satish patel wrote:

> We had echo issue before so we replaced old PRI card with Sangoma  
> A102D HWEC. Now my question is i set rx/txgain level 0.0 default do  
> i need to touch this value or default is best. I have read on google  
> and people say it should around 14844 on ztmonitor for rx/tx level  
> same.
>
> I just use milliwatt and test my default 0.0 rx/tx level and it come  
> around 4600.  Do you think i need to make it around 14844 ?


I have some Sangoma cards I've been running for several years at two  
different locations and never had to touch the gain levels. They run  
beautifully at the default of 0.0.

I also have some running at one location that I had to change the  
levels quite a bit. In that instance, I found the recommended 14844  
was off by about a factor of 10. If I tried to get those levels,  
things were obviously way out of line, all sorts of distortion would  
happen. I ended up using ztmonitor, but I just watched the gauge and  
tuned it like audio recording equipment. I targeted about 2/3 to 3/4  
up the graph as the average level. I didn't find a reliable milliwatt  
number to test on, so I just watched a bunch of normal calls.

Once I had things working at the best level testing by ear and  
watching the graph, I found the value ztmonitor reported was about  
4500-5000, or about 10 times lower than the info I found via google  
(I'm guessing I saw the same page you saw with the 14844 value).

-chris
<www.mythtech.net>