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 (see "Smart Reference
Monitoring" on the next page).
VersaSync 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.
To monitor the quality of references, navigate to TOOLS > SYSTEM: Reference
Monitor. The Reference Monitor screen will display:
3.3 Managing References
CHAPTER 3 • VersaSync User Manual Rev. 12
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