NTP Server - Information
The network time protocol (NTP) is used in order to synchronize the time of a
client over the Internet/Intranet with other computers or with an external clock.
The primary NTP timeservers are over external timers locked maximally exactly
to the Coordinated Universal Time (UTC). The NTP Client synchronize the time
with NTP commands with the servers indicated as an argument.
DCF77 - Information
The DCF77 radio clocks receive the official time of the federal republic of
Germany from the physical-technical federal institution (PTB) in Braunschweig
and transmit the signal over different interfaces to computers and systems. The
long-term accuracy of the PTB calibrating standard measure is achieved by radio
alignment of the sender DCF77 in Mainflingen at Frankfurt/Main of 1 x10 E-13
weekly. Due to the high accuracy only this time is recognized as legally binding in
the federal republic.
GPS - Information
000 km high satellites are moving in different orbits around the
arth. In every satellite is an atomic clock (min. accuracy 1x 10 E-12), whose time
sent out continuously with the orbital data. The GPS-receiver registers the
ates of minimum 3 ,maximum 6 satelites and calculates his position from
.
In approx. 20.
e
is
d
these values. If the position is computed, the terms of the dates can be
determined by the individual satellites. From these values the GPS world time is
determined in the timeserver and continued about a variable quartz time exactly
Änderungen vorbehalten Stand 09.09.05
ipcas GmbH ipEther232 V11.01 Seite 17 von 150
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