[time-nuts] NTP on steroid (was: a hijacked thread)
bg at lysator.liu.se
bg at lysator.liu.se
Mon Jan 16 12:08:32 UTC 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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