[Asterisk-Users] Asterisk - fax - spandsp

[Jean-Yves Avenard]

On 14/05/2005, at 3:59 AM, Colin Anderson wrote:
>
> Run ZTTEST in /usr/src/zaptel. Your output should be 99.98XXX% or  
> higher. If it isn't the corruption is most likely because of IRQ  
> misses by the card. Run it for a couple of minutes. Your "worst"  
> should be 99.98XXX%. Subtle timing errors and IRQ misses that are  
> not audible will screw up a fax. Also timing errors on your PRI are  
> another cause. You have to ensure your card is recieving timing  
> correctly by the telco. and your span is set up appropriately to  
> reflect that.
>
> Ensure the usual things are true: turn off any service you do not  
> absolutely need, disable Hyperthreading in the CPU, turn off any  
> device that you do not need, such as sound card, USB interface,  
> serial ports, parallell ports, everything you can think of is off.

I ran zttest:
and got:
--- Results after 347 passes ---
Best: 100.000000 -- Worst: 99.987793

I would say that 2/3rd of the tests were 100%.

I tried using the old stable spandsp library: 0.0.1k, but the results  
were even worse ; only the first 3 or 4 cm of the received fax were  
correct.

I will try upgrading to a newer kernel (I'm using Fedora Core 2 with   
2.6.8 kernel), turn off hyper-threading and see if it makes any  
difference...

Jean-Yves

---
Jean-Yves Avenard
Hydrix Pty Ltd - Embedding the net
www.hydrix.com | fax +61 3 95722686 | office +61 3 8573 5299 | direct  
+61 3 8573 5200

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