As there is no default entry for “Local System” and “GPS”, a new entry needs to
be added to the Reference Priorities table in order to use this combination of ref-
erences.
Step-by-step procedure:
1. Add a reference to the Reference Priority by clicking the PLUS icon. Use
the following settings, then click Submit:
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 Sys-
tem 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 Refer-
ence Monitoring.
Reference Monitoring helps to understand and predict system behavior, and is an
interference 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 ref-
erence 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 ref-
erences against the System Ontime Point. The phase values shown are the
filtered phase differences between each input reference 1PPS, and the internal dis-
ciplined 1PPS.
The data is plotted in a graph in real-time. The plot also allows you to display his-
toric data, zoom in on any data range or on a specific reference. A data set can be
exported, or deleted.
3.3 Managing References
CHAPTER 3 • SecureSync 2400 User Manual Rev. 5.2
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