Vers. No. 6.1
40 Released: 25/04/2017
4 Connecting the modules → Synchronization of several systems
Fig. 4-13 Possible types of time synchronization.
The absolute accuracy of the time information depends on the
method used. If you do not want to use or cannot use any time
synchronization lines, e.g. because the spacing of the systems is
too large, you must expect greater deviations. In Variant 2b the
deviations are about 5 milliseconds depending on the receiver,
but this depends on various factors, e.g. also on how often the
time information is received. In the variant 3b the time accuracy
of the GPS signal is decisive, which is only approx. 1 second abso-
lute.
The fourth method uses, for example, the SNTP
protocol (Simple
Network Time Protocol) used in the Microsoft Windows operating
system to transfer the date and time via Ethernet. However, the
individual Test Controllers must always query the time server in
order to be able to synchronize their times to the time server. The
achievable accuracy is therefore not as good as for the three
other methods. If required, you can also set up a (full) NTP time
server on a PC and synchronize it with a time server in the Inter-
net. You will find further informat
ion about this at http://
www.meinberg.de (here you can also downloaded a time server
program) and at http://www.pool.ntp.org. The time accuracy then
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