[ntp:hackers] A stop-gap authenticated time service
magnus at rubidium.dyndns.org
Fri Nov 13 00:15:43 UTC 2015
On 11/12/2015 08:46 AM, Poul-Henning Kamp wrote:
> In message <56439B35.3000103 at rubidium.dyndns.org>, Magnus Danielson writes:
>> Network "noise" breaks a bunch of assumptions, such as being stable.
> ...or even being "noise" rather than a signal.
Simple classical statistical values such as the mean and standard
deviation can vary a lot over time. There is indeed some strong
systematic components in these values at times, but completely
independent strong shifts can occur whenever. Even the shape of the
distribution shifts around.
It is even common to see people mistake the properties know from "a
network" with that being the properties of any network. Similar to the
non-converging noise-forms, it requires you to think again and put the
classic statistics to the side for a moment. Saying that, using ADEV or
TDEV on network noise is also not helpful, it's another mistake right
there. That's where I think the Allan intercept method might not be
completely useful in this case.
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