[ntp:questions] frequency adjusting only

maxime louvel m.louvel at gmail.com
Tue Apr 22 14:08:07 UTC 2008

On Tue, Apr 22, 2008 at 2:42 PM, Steve Kostecke <kostecke at ntp.org> wrote:

> On 2008-04-22, maxime louvel <m.louvel at gmail.com> wrote:
> > My goal is to achieve a synchronisation between the nodes (not
> > with the public NTP server) within 50 usec.
> You may want to explore other synchronization options such as IRIG,
> distributed PPS, or a distributed 10MHz clock.

Thanks I'm gonna look at some other synchronisation solution.

> >I don't care if the synchronisation to the public NTP is accurate
> >around half a second.
> You're displaying a common misconception about NTP.
> The goal of NTP is not explictly to synchronize clocks to "the one
> true time". Rather, NTP synchronizes clocks to a common time base. A
> "better" time base, and a "better" distribution method, allows tighter
> synchronization between nodes.
> It so happens that UTC (via GPS or HF Radio or UDP) is a ubiquitous,
> stable, and relatively inexpensive time base. A side effect of using UTC
> as your time base is that your clocks are synchronized to the correct
> time.

Sorry I haven't express myself correctly. What I meant is that I want an
accuracy of 50 usec within my subnet and I want my whole subnet to be
synchronised to UTC with an accuracy of 1 second or less if possible.

> --
> Steve Kostecke <kostecke at ntp.org>
> NTP Public Services Project - http://support.ntp.org/
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Maxime Louvel
0044 7964 5555 80
43 Allen road
Whitemore reans
WV60AW Wolverhampton
United Kingdom

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