Synchronizing the System Time in the
Network
106
7.3
Precision Time Protocol
Basic Configuration
Release
6.0
07/2010
7.3 Precision Time Protocol
7.3.1 Description of PTP Functions
Precise time management is required for running time-critical applications via
a LAN.
The IEEE 1588 standard with the Precision Time Protocol (PTP) describes a
procedure that assumes one clock is the most accurate and thus enables
precise synchronization of all clocks in a LAN.
This procedure enable the synchronization of the clocks involved to an
accuracy of a few 100 ns. The synchronization messages have virtually no
effect on the network load. PTP uses Multicast communication.
Factors influencing precision are:
X Accuracy of the reference clock
IEEE 1588 classifies clocks according to their accuracy. An algorithm that
measures the accuracy of the clocks available in the network specifies the
most accurate clock as the "Grandmaster" clock.
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