Ntp Mode; Primary Ntp Time Source; Backup Ntp Time Source; Ntp Multicast Address - Siemens VIU-20 Installation And Instruction

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7.3.11.1

NTP Mode

There are two Network Time Modes: Unicast and Broadcast (multicast).
Unicast Time Mode
•
In Unicast mode, the VIU requests time from a primary and a backup time server. The user must
supply the IP addresses or DNS names of the servers.
Broadcast Time Mode
•
In Broadcast (multicast) mode, the VIU listens for time updates from any server that is either
broadcasting time updates or sending them to a multicast group.
7.3.11.2

Primary NTP Time Source

The IP address or DNS name of the primary time server, if in Unicast mode.
Primary NTP Time Source range: valid IP address or DNS name (default = 0.0.0.0).
7.3.11.3

Backup NTP Time Source

The IP address or DNS name of the backup time server, if in Unicast mode.
Backup NTP Time Source range: valid IP address or DNS name (default = 0.0.0.0).
7.3.11.4

NTP Multicast address

When mode is Broadcast/Multicast and the user wants the VIU to join a specific multicast group
for SNTP time updates, that multicast group address is entered here. This address is optional.
The VIU will still receive broadcasted time updates if this field is set to 0.0.0.0.
NTP Multicast Address range: valid IP address (default = 0.0.0.0).
7.3.11.5

NTP UDP Port

The UDP port number to use for SNTP messages.
NTP UDP Port range: 0 – 65535 (default = 123).
7.3.11.6

NTP Polling Rate

The NTP Polling Rate determines how often the VIU requests updates from the Time Server,
measured in seconds, when in Unicast mode.
NTP Polling Rate range: 0 – 65535 seconds (default = 60 seconds).
7.3.11.7

NTP Wait Time

The time period in which the VIU expects to receive a time update when in Broadcast/Multicast
mode. If no time update is received, the time source is considered offline.
NTP Wait Time range: 0 – 65535 seconds (default = 120 seconds).
SIG-00-07-11
Version No.: B.2
VIU WEB BROWSER USER INTERFACE
7-27
SEPTEMBER 2012 (REVISED OCTOBER 2019)