In the Priority Level text box, enter 1. This will give this reference the highest
priority.
In the Time field, select “Local System”.
In the PPS field, select “GPS”.
Check the Enabled checkbox.
2.
Confirm that the first reference in the Reference Priority table has “Local System”
as the Time input and "GNSS" as the 1PPS input.
3.
After a power cycle or reboot, as soon as GNSS is declared valid, the System Time
will automatically be used as-is, with no manual intervention required.
3.3.2 Reference Qualification and Validation
3.3.2.1 Reference Monitoring: Phase
The quality of input references can be assessed by comparing their phase offsets against
the current system reference, and against each other. This is called Reference Mon-
itoring.
Reference Monitoring helps to understand and predict system behavior, and is an inter-
ference mitigation tool. It can also be used to manually re-organize reference priorities e.g.,
by assigning a lower reference priority to a noisy reference or a reference with a significant
phase offset, or to automatically failover to a different reference if certain quality
thresholds are no longer met.
SecureSync allows Reference Monitoring by comparing the phase data of references
against the System Ontime Point. The phase values shown are the filtered phase dif-
ferences between each input reference 1PPS, and the internal disciplined 1PPS.
The data is plotted in a graph in real-time. The plot also allows you to display historic data,
zoom in on any data range or on a specific reference. A data set can be exported, or
deleted.
To monitor the quality of references, navigate to TOOLS > SYSTEM: Reference Mon-
itor. The Reference Monitor screen will display:
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CHAPTER 3 • SecureSync 2400 User Manual Rev. 2
3.3 Managing References
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