[Asterisk-Users] Problems with TDM400P card

[Anton Krall]

Im using RH9 and celerom 1.7 with 256 Mb RAM

Can you give me the detailed math on your calculations? 

|-----Original Message-----
|From: asterisk-users-bounces at lists.digium.com 
|[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of 
|Rich Adamson
|Sent: Sábado, 30 de Abril de 2005 11:07 a.m.
|To: Asterisk Users Mailing List - Non-Commercial Discussion
|Subject: RE: RE: [Asterisk-Users] Problems with TDM400P card
|
|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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