[time-nuts] NTP on steroid (was: a hijacked thread)

bg at lysator.liu.se bg at lysator.liu.se
Mon Jan 16 07:08:32 EST 2012


>> The best you can get out of NTP is about 1ms. While UMTS needs something
>> in the us range for proper working IIRC.
>>
>> Attila Kinali
>
> NTP fed with a PPS source can do much better than 1 ms.  Here's a
> non-temperature-controlled, simple Intel Atom system providing within 10
> microseconds using FreeBSD 8.0:
>
>   http://www.satsignal.eu/mrtg/pixie_ntp.html
>
> Of course, if you mean "over the Internet", then even 1 ms might be
> optimistic!
>
> Cheers,
> David

NTP on steroids taken literally could point at PTP (IEEE-1588)

   http://en.wikipedia.org/wiki/Precision_Time_Protocol

I have heard talks of accuracies down towards 20ns.

There is also something called "hardware NTP", which would give sub 1us
accuracies.

--

    Björn





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