Application Example - Hirschmann RS20 User Manual

Synchronizing the System Time in the
Network
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)
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".
GPS
Reference
(Grandmaster Clock)
10.0.1.2
Boundary
Figure 31: Example of PTP synchronization
A: Device with RT module
B: Device without RT module:
112
gets the time from the NTP server via SNTP. The
A
10.0.1.112
Clock
10.0.1.105
7.3 Precision Time Protocol
A
10.0.1.116
Ordinary Clock
B B
10.0.1.106
Basic Configuration
Release 6.0 07/2010