See "Manually Setting the Time" on page150.
Using the "User" Reference with Other References
If the User/User reference is used in conjunction with other, external references (such as GNSS
or IRIG), the System Time should be set as accurately as possible:
Otherwise, the large time correction that needs to be bridged when switching from a lost ref-
erence to a valid reference, or from a valid reference to a higher-priority reference that has
become available again, will cause NTP to exit synchronization. If the difference is under
1second, NTP will remain in sync and will "slew" (over a period of time) to the new reference
time.
3.3.1.4 Reference Priorities: EXAMPLES
Example 1 – GNSS as primary reference, IRIG as backup:
In this use case, the objective is to use:
GNSS as the primary Time, and 1PPS reference
IRIG as the backup Time, and 1PPS reference.
Step-by-step procedure:
1.
Move the reference which has “GPS 0” in the Time column and “GPS 0” in the 1PPS
column to the top of the table, with a Priority value of 1. Click the Enabled checkbox.
2.
Move the reference which has “GPS 0” in the Time column and “GPS 0” in the 1PPS
column to the top of the table, with a Priority value of 1. Click the Enabled checkbox.
3.
Move the reference which has “GPS 0” in the Time column and “GPS 0” in the 1PPS
column to the top of the table, with a Priority value of 1. Click the Enabled checkbox.
Since both of these references are
default
references, no additional references need to be
added to the Reference Priority table.
Example 2 – IRIG as primary reference, NTP input as backup
In this use case, the objective is to use:
IRIG as the primary reference input
Another NTP server as backup reference
Step-by-step procedure:
1.
Move the reference which has “IRIG 0” in both the Time column and “IRIG 0” in the 1PPS
column to the top of the table, with a Priority value of 1. Click the Enabled checkbox.
3.3 Managing References
CHAPTER 3 • SecureSync User Reference Guide Rev. 26
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