[time-nuts] sync computer clock ticks

[Michael Di Domenico]

I've used NTP for years, but i was under the impression that it is not
able to synchonize the clocks below 1 or 2 seconds.   Can you point me
towards a specific article that speaks about the configuration
parameters to get ntp sync'd that low?

On Jan 3, 2008 10:25 PM, Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
>
> Michael Di Domenico wrote:
> > This has probably been asked many times before, but i am unable to
> > find any documentation to point me in the right direction.  And yes i
> > am a newbie with clocks...
> >
> > I'd like to synchronize the clock ticks on 16 different computers
> > running linux, down to the 1usec area.  Is this even possible from a
> > computer hardware standpoint?
> >
> > If so, can someone point me towards some documentation that explains
> > how to wire up 16 computers to a reference clock source and override
> > the computer internal clocks?
> >
> > I found the Symetricom website, but it seems light on details on
> > exactly how a solution like this all connects together and they're
> > products are likely outside my budget.
> >
> > Ideally, I'd like to use the serial port on each of these 16 servers
> > to connect to some device to get the synchronization signal from a
> > reference.  Even if this was possible, i don't think it would get me
> > to 1usec though.
> >
> > Thanks
> > - Michael
> >
> >
> Michael
>
> Google ntp.
>
> It is unlikely that you will synchronise the computer clocks to within
> 1us with ntp unless the computer hardware and operating system is
> suitably modified.
> This can be done cheaply (one machine needs to be setup as a dedicated
> stratum 1 ntp server synchronised to a good time source like a M12M gps
> timing receiver or equivalent device).
> NTP broadcasts the required info as LAN packets.
>
> If you really need that precisionyou may need to use ptp with suitable
> hardware (National Instruments and others have suitable boards)
> NIST has a webpage on PTP.
>
>
> Bruce
>
>
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