[Asterisk-Users] Re: Echo SIP-T100P-PRI

[Deon Rodden]

Have you considered relocating the hard drive (or Asterisk configs) and 
the T100P card to a temporary machine? Even a lower class machine, just 
to eliminate the SuperMicro as the possibility?

I'm interested in your research as we will be deploying some low end 
$800 1U (very short) SuperMicro servers out in the field equipped with 
T100P cards in them. They have Celeron 2ghz processors, 512mb of RAM and 
a regular IDE hard drive. But if there is an incompatibility with the 
way SuperMicro makes their motherboards, then I need to stop them from 
placing the order for 10 of these units on Monday.

Ryan Thrash wrote:

> On Aug 19, 2004, at 5:33 PM, Rich Adamson wrote:
>
>> Mike Schwartz wrote:
>>
>>>>> I'm experience echo on outgoing calls:
>>>>>  Snom 200 ----> Asterisk ----> T100P ----> PRI ----> called party
>>>>>
>>>>> I am getting echo on the Snom 200 phone. The called party does not
>>>>> hear the echo.
>>>>
>
> <snip>
>
>> When that discussion was going on a few weeks ago, the echo issue
>> seemed to have been narrowed down to two possibiliites; 1) interrupt
>> service latency, or, 2) PCI bus latencies. Processor speed does not
>> seem to be a driving factor as noted above.
>>
>> I've not heard anyone (as yet) come up with the tools or process for
>> actually identifying the root-cause. Would be nice for those of us
>> that aren't programmers.
>
>
> Some more echo food for thought. It's most noticeable on very short, 
> hard sounds (like "CH"), so as someone mentioned, reverb might be the 
> right description. I've spent the better part of several hours 
> experimenting with various combinations of adjusting taps from 32 to 
> 256, echowhenbridged on and off and txgain adjustments. I just flat 
> can't get it to go away...
>
> I'm also one of those "luck" ones with a Supermicro box (dual Xeons 
> and plenty of RAM). How in the heck would/should I go about figuring 
> out what the interrupt service latency or the PCI bus latency is 
> doing. Any other thoughts on the front? I'm using GS phones so maybe 
> their echo can algorithms are to blame... hmmm...
>
> Here's to hoping,
> Ryan Thrash
>
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