In order for SecureSync to declare synchronization, it needs both a valid 1PPS, and Time ref
erence.
The concept of Reference Priority allows the ranking of multiple references for redundancy. This
allows SecureSync to gracefully fall back upon a lower ranking 1PPS or Time reference
without transitioning into Holdover, in case a reference becomes unavailable or invalid. The
priority order you assign to your available references typically is a function of their accuracy
and reliability.
Note: The References shown on your screen may look different from the ones in
the illustration below, depending on your SecureSync Time and Frequency Syn
chronization System model and hardware configuration.
Each available type of Time and 1PPS input reference is assigned a human-readable name or
“title” that is used in the Reference Priority table, indicating the type of reference. The reference
titles are listed in the following table:
Table 3-1:
Reference priority titles
Title Reference
ASCII Timecode ASCII serial timecode input
External 1PPS input External 1PPS input
Frequency External Frequency input
GNSS GNSS input
PTP PTP input
IRIG IRIG timecode input
Local System Built-in clock OR internal 1PPS generation
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CHAPTER 3 • SecureSync User Reference Guide Rev. 23
3.3 Managing References
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