Additional information about regional time zones and DST can be found on the following
web sites: http://www.worldtimeserver.com/,
http://webexhibits.org/daylightsaving/b.html.
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 redund-
ancy. This allows SecureSync to gracefully fall back upon a lower ranking 1PPS or Time ref-
erence 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
illustration below, depending on your SecureSync 2400 Time and Fre-
quency Synchronization System model and hardware configuration.
3.3 Managing References
CHAPTER 3 • SecureSync 2400 User Manual Rev. 2
183
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