[asterisk-users] Stable clock with 2.6 and without Digium hardware.

[Tzafrir Cohen]

On Fri, Nov 10, 2006 at 03:28:09PM +0200, Anton Tinchev wrote:
> Zoa wrote:
> 
> >Can you tell us how you do the testing ?
> 3-4 different ways. All gives same results, so test are pretty valid.
> 
> 1. Interrupt counting inside the PC.
> 2. TDMoE packet counting on the switch.
> 3. External TDMoE equipment connected thru extreme network swich.
> The card of the PC and the device only connected to the switch. The switch 
> filters all packets except TDMoE to de device.
> Calibrated oscilloscope conected to the interupt leg of the network chip. 
> All coalescing/etc disabling.
> 4. Diagnostic results from firmware of the device.
> 5. ToDo test - oscilloscope directly conected to pads inside the PC, but 
> needs mechanical work for each platform/type.
> 6. ToDo test - some driver relays the clock to simple hardware card in the 
> PC and oscilloscope connected to it.

How about meassuring it directly? For starters, take a look at zttest.c .

(Though it could use some slightly better accuracy).

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               Tzafrir Cohen       
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