Hello to All,

I understand (e.g. from Mills papers) that the Allan variance can be used to

characterise timing sources and clock drifts.

I was wondering about the significance of calculating the Allan variance

for a clock disciplined by NTP, while being affected by network jitter

(assuming high quality timing source).

Can the Allan variance be used to provide a quality measure of NTP in a

particular network? or lower order statistics, such as mean of the

frequency/offset errors are more apt to quantify NTP.

My aim is to provide a quantitative measure of NTP ability at

disciplining a particular oscillator, under different network jitter.

Such that a minimum network quality can be recommended in order to

achieve given accuracy (or in my case frequency stability).

Anybody has done any work in this direction?

Thanks,

Mauro

--

Mauro Fiacco

ip.access Ltd

URL: www.ipaccess.com

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