[asterisk-users] fxotune question

[Matthew Fredrickson]

John Morey wrote:
> I switch the wires in lines 5-8 (i.e. reversed tip and ring) and reran
> fxotune to tune the lines.  fxotune.conf ended up looking exactly the same
> as before the change.  Since I was expecting/hopping to see a change but did
> not I switched everything back to the way it was. Is there a way to test the
> lines, using a multi-meter maybe, to tell if the tip and ring are correct or
> reversed?
> 
> After putting things back I reran fxotune to get the verbose output. It,
> foxtune.out.gz, is attached.  fxotune seems to have had a better time with

It seems that one way or another the attachment didn't go through.  Can 
you email the tarball to me directly or post it to a website?

Thanks,
Matthew Fredrickson

> line 7 during this run.  fxotune.conf now contains:
> 
>    5=7,255,251,251,2,255,255,1,255
>    6=7,255,251,251,2,255,255,1,255
>    7=4,0,0,0,0,0,0,0,0
>    8=7,255,251,251,2,255,255,1,255
>    9=4,0,0,0,0,0,0,0,0
>    10=5,0,0,0,0,0,0,0,0
>    11=0,0,0,0,0,0,0,0,0
>    12=0,0,0,0,0,0,0,0,0
> 
> I tried calling directly into the lines above and it seems lines 5,6,8 have
> much more echo than lines 7,9,10. So just for fun I edited fxotune.conf to
> the following and reloaded (fxotune -s) it:
> 
>    5=5,0,0,0,0,0,0,0,0
>    6=5,0,0,0,0,0,0,0,0
>    7=4,0,0,0,0,0,0,0,0
>    8=5,0,0,0,0,0,0,0,0
>    9=4,0,0,0,0,0,0,0,0
>    10=5,0,0,0,0,0,0,0,0
>    11=0,0,0,0,0,0,0,0,0
>    12=0,0,0,0,0,0,0,0,0
> 
> Unless I am just spacing out the echo on 5,6,8 seems less now.  I really
> have no idea what is going on.
> 
> John
> 
> 
> On Fri, Jun 6, 2008 at 1:31 PM, Matthew Fredrickson <creslin at digium.com>
> wrote:
> 
>> John Morey wrote:
>>> Tilghman,
>>>
>>> Thanks for the pointer.  I'll check this tomorrow and let you know.
>> Also, I would like to see the output without the "-d" flag and with the
>> "-v" flag.  This will output a lot of data (the echo ratio for every
>> possible coefficient setting it has tried per port).
>>
>> Matthew Fredrickson
>>
>>> John
>>>
>>> On Wed, Jun 4, 2008 at 11:18 PM, Tilghman Lesher <
>>> tilghman at mail.jeffandtilghman.com> wrote:
>>>
>>>> On Wednesday 04 June 2008 22:02:19 John Morey wrote:
>>>>> Hello,
>>>>>
>>>>> I've run fxotune at different times but continue to get what seem to be
>>>>> strange numbers in /etc/fxotune.conf.  It ends up with:
>>>>>
>>>>>     5=7,255,251,251,2,255,255,1,255
>>>>>     6=7,255,251,251,2,255,255,1,255
>>>>>     7=7,255,251,251,2,255,255,1,255
>>>>>     8=9,2,250,253,4,252,0,255,255
>>>>>     9=4,0,0,0,0,0,0,0,0
>>>>>     10=5,0,0,0,0,0,0,0,0
>>>>>     11=0,0,0,0,0,0,0,0,0
>>>>>     12=0,0,0,0,0,0,0,0,0
>>>>> ports 5-10 have lines hooked up to them.  The first four lines seem
>>>> strange
>>>>> when compaired to what others have posted and what ports 9 and 10 have.
>>>>>
>>>>> Also if I'm reading things right my echo ratios seem to be very
>>>>> high.  Running "fxotune -d -b 5 -w 1004" gives the following:
>>>>>     Dumping module /dev/zap/5
>>>>>     echo ratio = 0.1759 (1960.0 / 11145.0)
>>>>> Which I read to be over 17%.  This seems crazy.  Am I reading this
>> right?
>>>>> Where should I start to look for problems?
>>>> You might check to see if the tip and ring are reversed in your wiring.
>>>>  That
>>>> can frequently cause weird echo problems.
>>>>
>>>> --
>>>> Tilghman
>>>>
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>>>
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>>
>> --
>> Matthew Fredrickson
>> Software/Firmware Engineer
>> Digium, Inc.
>>
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-- 
Matthew Fredrickson
Software/Firmware Engineer
Digium, Inc.