[asterisk-users] fxotune question

[Drew Gibson]

Drew Gibson wrote:
>>>> Tilghman Lesher wrote:
>>>>         
>>>> My fxotune.conf:-
>>>>
>>>> 13=7,255,251,251,2,255,255,1,255
>>>> 14=9,254,251,255,2,0,1,0,0
>>>> 15=9,254,251,255,2,0,1,0,0
>>>> 16=5,0,0,0,0,0,0,0,0
>>>> 17=9,254,251,255,2,0,1,0,0
>>>> 18=9,254,251,255,2,0,1,0,0
>>>> 19=9,254,251,255,2,0,1,0,0
>>>> 20=9,254,251,255,2,0,1,0,0
>>>> 21=9,254,251,255,2,0,1,0,0
>>>> 22=9,254,251,255,2,0,1,0,0
>>>> 23=9,254,251,255,2,0,1,0,0
>>>> 24=9,254,251,255,2,0,1,0,0
>>>>
>>>> regards,
>>>>
>>>> Drew
>>>>       
>>>>         
>>   
>>     
>
> Thanks Tilghman,
>
> I will try flipping one of the lines at the weekend, can't touch it 
> during the week.
>
> Our rxgain was raised from 0.0 to 2.0 at the end of February after 
> complaints that CC staff couldn't hear customers but the 'static' issues 
> pre-date that change.
>
> regards,
>
> Drew
>
>   

Hi Tilghman,

I thought I had found something, all of the lines were patched in with 
Cat 5 patch cords except Port 16 which had a telephone cable (which 
would flip the polarity). After changing all the patch cables to 
telephone type, I re-ran fxotune but the results were almost identical 
to the original settings.

new fxotune.conf:-

13=7,255,251,251,2,255,255,1,255
14=9,254,251,255,2,0,1,0,0
15=6,1,254,253,0,255,0,0,0
16=5,0,0,0,0,0,0,0,0
17=9,254,251,255,2,0,1,0,0
18=9,254,251,255,2,0,1,0,0
19=9,254,251,255,2,0,1,0,0
20=7,255,251,251,2,255,255,1,255
21=9,254,251,255,2,0,1,0,0
22=9,254,251,255,2,0,1,0,0
23=6,1,254,253,0,255,0,0,0
24=9,254,251,255,2,0,1,0,0

These results are very similar to John Morey's, eg. not much changed 
after reversing polarity.

The one line that shows zero's all the way across is the line with our 
DSL backup line on it. Is it the filter giving these results or does the 
telco take more care balancing lines for DSL?

Shouldn't I have seen a major change of settings after changing polarity 
for tip&ring?

regards,

Drew


-- 
Drew Gibson

Systems Administrator
OANDA Corporation
www.oanda.com