3.3 Managing References
3.3.1 Input Reference Priorities
SecureSync can be synchronized to different time and frequency sources that
are referred to as Input References, or just References.
References can be a GNSS receiver, or other sources delivered into your
SecureSync unit via dedicated (mostly optional) inputs. It is also possible to enter
a system time manually, which SecureSync then can synchronize to.
In order for SecureSync to declare synchronization, it needs both a valid 1PPS,
and Time reference.
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 ref-
erences typically is a function of their accuracy and reliability.
Note: The References shown on your screen may look different from
the illustration below, depending on your SecureSync 2400 Time and
Frequency Synchronization System model and hardware con-
figuration.
Each available type of Time and 1PPS input reference is assigned a human-read-
able 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:
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CHAPTER 3 • SecureSync 2400 User Manual Rev. 5.2
3.3 Managing References
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