[Asterisk-Users] Problems with TDM400P card

[Rich Adamson]

The way that zttest is written makes it a little difficult to
interpret, but it essentially means that zttest tried to read
8192 bytes from the TDM card, and it took more then 1 second to
do it (the objective is exactly 1.00000 seconds, or 100%).
The 99.987 numbers says it took something like 1.021111 seconds
to read the 8192 bytes instead. Because it took about 21,0000
microseconds too long, frame slips are going to be happening
approximately every 10 seconds. (That's why spandsp doesn't work
right.)
I'm not sure (as yet) what the source of the delays are, but that's
what some of us are trying to figure out.

What OS distro are you using?

------------------------
> Hows does this look?
> 
> Opened pseudo zap interface, measuring accuracy...
> 
> 8192 samples in 8192 sample intervals 100.000000%
> 8192 samples in 8193 sample intervals 99.987793%
> 8192 samples in 8193 sample intervals 99.987793%
> 8192 samples in 8193 sample intervals 99.987793%
> 8192 samples in 8193 sample intervals 99.987793%
> 8192 samples in 8193 sample intervals 99.987793%
> 8192 samples in 8193 sample intervals 99.987793%
> 8192 samples in 8193 sample intervals 99.987793%
> 8192 samples in 8193 sample intervals 99.987793%
> 8192 samples in 8194 sample intervals 99.975586%
> 8192 samples in 8193 sample intervals 99.987793%
> 8192 samples in 8193 sample intervals 99.987793%
> 8192 samples in 8193 sample intervals 99.987793%
> --- Results after 13 passes ---
> Best: 100.000000 -- Worst: 99.975586 -- Average: 99.987793
> 
> Good enough and what do I need to check in order to make 100%? What does the
> test actually measure?
> 
>  
> 
> |-----Original Message-----
> |From: asterisk-users-bounces at lists.digium.com 
> |[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of 
> |Kim Culhan
> |Sent: Sábado, 30 de Abril de 2005 08:45 a.m.
> |To: asterisk-users at lists.digium.com
> |Subject: Re: RE: [Asterisk-Users] Problems with TDM400P card
> |
> |On Fri, April 29, 2005 4:58 pm, GEOFFREY SACHS said:
> |> I would also be interested in alternatives to the Tdm400p. I 
> |have had 
> |> endless problems with a tdm400p card not being able to get 
> |the zttest 
> |> numbers above
> |> 99.975 and as a result not being able eliminate an 
> |intermitent but consistent echo.
> |> I have tried to date 4 different motherboard and hardware 
> |combinations 
> |> as well as different linux versions to no avial.I would 
> |welcome some feedback on this.
> |
> |Since there appear to be several combinations of hardware and 
> |operating system which don't work well, here is a combination 
> |which appears to work fairly well:
> |
> |Intel 925XCV mb
> |
> |P-4 560 (3.6 gHz)
> |
> |wcfxs0: <Wildcard TDM400P REV E/F>
> |
> |FreeBSD 5.4-STABLE
> |
> |zttest -v
> |Opened pseudo zap interface, measuring accuracy...
> |
> |8192 samples in 8192 sample intervals 100.000000%
> |8192 samples in 8192 sample intervals 100.000000%
> |8192 samples in 8192 sample intervals 100.000000%
> |8192 samples in 8192 sample intervals 100.000000%
> |8192 samples in 8192 sample intervals 100.000000%
> |8192 samples in 8192 sample intervals 100.000000%
> |8192 samples in 8192 sample intervals 100.000000%
> |8192 samples in 8192 sample intervals 100.000000%
> |8192 samples in 8192 sample intervals 100.000000%
> |8192 samples in 8192 sample intervals 100.000000% ^C
> |--- Results after 10 passes ---
> |Best: 100.000000 -- Worst: 100.000000 -- Average: 100.000000
> |
> |hope this helps
> |
> |-kim
> |
> |--
> |w8hdkim at gmail.com
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---------------End of Original Message-----------------