NTP for domain

Can someone recomend at least 2 stratum 0 (zero) sources

my requiremet is:
The synchronisation period and clock accuracy of all elements of the system, including all equipment, shall be such that no clock is ever more than two (2) seconds different from the stratum 0 reference time.
porto111Asked:
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Will SzymkowskiConnect With a Mentor Senior Solution ArchitectCommented:
Take a look at the link below as it provides several stratum "0" time servers. Select your country and your done.

Stratum 0 Time Servers - http://support.ntp.org/bin/view/Servers/StratumOneTimeServers

Will.
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porto111Author Commented:
I thought a stratum 0 had to be a device such as GPS NTP server , something that gets its time not over the network
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frankhelkCommented:
I would recommend to circumvent the use of W32time (that piece of crap annoyed me whenever I used it in NTP mode).

Just use a Windows port of the classic *UX NTP client on all machines. Easy to install, works like a charm, is stable as a rock and (in the seldom cases) better to troubleshoot than W32time. Usually keeps a zoo of stations in sync within some tens of milliseconds.

Have a look at my article on NTP and don't hesitate to ask me if you have additional questions.
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gheistCommented:
For two second offset you can set time from wall clock with seconds arrow. No need to bugger high-accuracy services on internet.
Even synchroonising from stratum 4 server across the planet you will be within 1/100th of second.
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frankhelkCommented:
For two second offset you can set time from wall clock with seconds arrow

That's correct - but why do it manually with a regular schedule when there's free software around to do that with much better accuracy ?
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gheistCommented:
Probably you need to use some math to project drift of individual clocks and adjust sync period accordingly
By default windows syncs every 24h and logs the result. If the step then exceeds 1s you should consider replacing defective clock in machine (with soldering iron) or syncing more often.
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