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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

VersaSync 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 VersaSync unit

via dedicated (mostly optional) inputs. It is also possible to enter a system time manually,

which VersaSync then can synchronize to.

In order for VersaSync 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 redund-

ancy. This allows VersaSync 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

ones in the illustration below, depending on your VersaSync Time and Fre-

quency Synchronization 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

3.3 Managing References

CHAPTER 3 • VersaSync User Manual Rev. 7.0

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