RUGGEDCOM ROS
User Guide
Chapter 5
Setup and Configuration
Configuring NTP 181
Parameter Description
This parameter specifies the amount of time to be shifted forward/backward when DST
begins and ends. For example for most part of USA and Canada, DST time shift is 1
hour (01:00:00) forward when DST begins and 1 hour backward when DST ends.
DST Rule Synopsis: mm.n.d/HH:MM:SS mm.n.d/HH:MM:SS
This parameter specifies a rule for time and date when the transition between Standard
and Daylight Saving Time occurs.
• mm - Month of the year (01 - January, 12 - December)
• n - nth d-day in the month (1 - 1st d-day, 5 - 5th/last d-day)
• d - day of the week (0 - Sunday, 6 - Saturday)
• HH - hour of the day (0 - 24)
• MM - minute of the hour (0 - 59)
• SS - second of the minute (0 - 59)
Example: The following rule applies in most part of USA and Canada:
03.2.0/02:00:00 11.1.0/02:00:00
DST begins on March's 2nd Sunday at 2:00am.
DST ends on November's 1st Sunday at 2:00am.
Section 5.6.2
Configuring NTP
ROS may be configured to refer periodically to a specified NTP server to correct any accumulated drift in the on-
board clock. ROS will also serve time via the Simple Network Time Protocol (SNTP) to hosts that request it.
Two NTP servers (primary and backup) may be configured for the device. The primary server is contacted first for
each attempt to update the system time. If the primary server fails to respond, the backup server is contacted. If
either the primary or backup server fails to respond, an alarm is raised.
To configure either the primary or backup NTP server, do the following:
1. Navigate to Administration » System Time Manager » Configure NTP Server. The NTP Server table
appears.
Figure 126: NTP Server Table
2. Select either Primary or Backup. The NTP Server form appears.
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