Synchronizing the System Time in the
Network
UM Basic Configuration L3P
Release
7.1
12/2011
7.3
Precision Time Protocol
139
7.3.3 Application Example
PTP is used to synchronize the time in the network. As an SNTP client, the
left device (see fig. 31) gets the time from the NTP server via SNTP. The
device assigns PTP clock stratum 2 (PTPv1) or clock class 6 (PTPv2) to the
time received from an NTP server. Thus the left device becomes the
reference clock for the PTP synchronization and is the “preferred master”.
The “preferred master” forwards the exact time signal via its connections to
the RT module. The device with the RT module receives the exact time signal
at a connection of its RT module and thus has the clock mode “v1-boundary-
clock”. The devices without an RT module have the clock mode “v1-simple-
mode”.
Figure 31: Example of PTP synchronization
A: Device with RT module
B: Device without RT module:
GPS
Reference
(Grandmaster Clock)
Boundary
Clock
Ordinary Clock
A
10.0.1.112
A
10.0.1.116
B
10.0.1.105
10.0.1.2
B
10.0.1.106
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