[time-nuts] Type synch
k6rtm at comcast.net
k6rtm at comcast.net
Sun Aug 29 01:50:24 UTC 2010
Date: Sat, 28 Aug 2010 18:31:14 -0500
From: "Bill Hawkins" <bill at iaxs.net>
Subject: [time-nuts] Does GPS time reception work everywhere all of
the time?
Bill--
Depending on what you mean by "synchronization" you may also want to look at IEEE-1588 (Time Synch) and the work done by John Eidson (at HP/Agilent).
IEEE-1588 lets you tightly synchronize devices (and data collection) over Ethernet networks.
(I worked with John at HP/Agilent.)
Cheers--
Bob Martin K6RTM in Silicon Valley
----------------
To: "'Discussion of precise time and frequency measurement'"
<time-nuts at febo.com>
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I'm involved with time synchronization of control system
computers for multi-national businesses. GPS springs to
mind as a way to synchronize time anywhere. Or is it?
What about monsoon rains?
The Internet is available almost everywhere that control
computers are used, but many users prefer to use a data
diode between them and the Internet. Control computers
are now essential for manufacturing processes. Some of
the processes run constantly for years without stopping
for any kind of security update. Some of the downtimes
cost millions of dollars per day.
A GPS time system allows the control systems to be
synchronized in time, so that messages sent periodically
through the data diodes will have the correct time stamp
on various events that occur in the process.
But does that work everywhere all of the time? Where can
I find answers?
Thanks in advance, as we used to say.
Bill Hawkins
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