Re: [Asterisk-Users] Asterisk - fax - spandsp

Jean-Yves Avenard Fri, 13 May 2005 18:29:33 -0700

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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Re: [Asterisk-Users] Asterisk - fax - spandsp

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