Siemens SCALANCE W1780 Configuration Manual page 198

Configuring with Web Based Management
6.5 "System" menu
● Daylight Saving Time (DST)
Shows whether the daylight saving time changeover is active.
– active (offset +1 h)
– inactive (offset +0 h)
● SNTP Mode
Select the synchronization mode from the drop-down list. The following types of
synchronization are possible:
– Listen
– Poll
● Poll Interval[s]
Here, enter the interval between two time queries. In this box, you enter the query interval
in seconds. Possible values are 16 to 16284 seconds.
● SNTP Server Address
Enter the IP address or the FQDN (Fully Qualified Domain Name) of the SNTP server.
● SNTP Server Port
Enter the port of the SNTP server.
The following ports are possible:
– 123 (standard port)
– 1025 to 36564
● Primary
The check mark is set for the SNTP server that you create first. If several SNTP servers have
been created, the primary server is queried first.
Procedure
1. Click the "SNTP Client" check box to enable the automatic time setting.
2. In the "Time Zone" input box, enter the local time difference to world time (UTC). The input
format is "+/-HH:MM" (for example +02:00 for CEST), because the SNTP server always
sends the UTC time. This time is then recalculated and displayed as the local time based on
the specified time zone. You configure the daylight saving time switchover on the pages
"System > System Time > DST Overview" and "System > System Time > DST
Configuration". You also need to take this into account when completing the "Time Zone"
input box.
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The system time was changed to daylight saving time; in other words an hour was added.
You can see the current system time at the top right in the selection area of the WBM.
The current time including daylight saving time is displayed in the "System Time" box.
The current system time is not changed.
With this mode, the device is passive and receives SNTP frames that deliver the time of
day. Settings in the input boxes "SNTP Server Address" and "SNTP Server Port" have
no effect in this mode.
In this mode, only IPv4 addresses are supported.
If you select this mode, the input box "Poll Interval[s]" is displayed to allow further
configuration. In this mode, the settings in the input boxes "SNTP Server Address" and
"SNTP Server Port" are taken into account. With this type of synchronization, the device
is active and sends a time query to the SNTP server.
In this mode, IPv4 and IPv6 addresses are supported.
SCALANCE W1780/W1740 according to IEEE 802.11ac Web Based Management
Configuration Manual, 11/2019, C79000-G8976-C485-03