Whilst Windows is not good for accurate time synchronisation using any
tool, the current versions of w32time, the native Windows NTP support,
can be configured
<https://technet.microsoft.com/en-us/library/cc773263%28v=ws.10%29.aspx#w2k3tr_times_tools_uhlp>
to be much better than the out of the box configuration. In particular
you must make sure that you specify servers without the special poll
interval flag.
t can be set to behave pretty much like the reference implementation of
version 3 NTP. Windows ports of the reference implementation of version
4 NTP software, that the servers you use are likely to be using, are
available at no charge, and, for example, Meinberg supply a free
installer for it. Whilst another branch of this thread (not yet on the
digest) tends to perpetuate the misunderstanding that this was written
by Meinberg, that is not true. It is actually the open source reference
implementation, as used on many and available for all Linux systems (but
with some build options set for Windows). Meinberg have simply added a
Windows installer.
Properly tuned I'd expect 95 percentile accuracy as about 20ms with
w32time, maybe 10ms with the reference implementation and better than
1ms with Linux.
Out of the box w32time polls at very long intervals (7 days for
standalone installations) and is designed to keep the time accurate to
within the few seconds needed for Kerberos authentication on Windows
networks, but the current software can be tuned for poll rates of
seconds, use multiple servers and interpolate with frequency compensation.
The continued existence of software like Dimenion 4 and Tardis owes more
to marketing than to being better solutions. (Microsoft are not
interested in Windows client systems being used outside of a Windows
network, so don't advertise the full capabilities of w32time.)
Incidentally, the primary author of the NTP protocol specification and
its reference implementation is W3HCF.
--
David Woolley
Owner K2 06123
On 26/06/15 22:22, Josh Fiden wrote:
Most 6m EME guys I know are using Dimension 4. Works great and in my
experience MUCH more accurate than the built-in Windows time sync.
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