Hirschmann RS20 Reference Manual page 75

Time 3.1 Basic Settings
Note: When setting the time in zones with summer and winter times, make
an adjustment for the local offset, if applicable. The device can also get the
SNTP server IP address and the local offset from a DHCP server.
Interaction of PTP and SNTP
According to PTP (IEEE 1588) and SNTP, both protocols can exist in parallel
in the same network. However, since both protocols affect the system time of
the device, situations may occur in which the two protocols compete with
each other.
The PTP reference clock gets its time either via SNTP or from its own clock.
All other clocks favor the PTP time as the source.
Figure 27: Time Dialog:Basic Settings
RM GUI L2E
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Release 8.0 05/2013