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 reli-
ability.
Note: The References shown on your screen may look different from the ones in
the illustration below, depending on your VersaSync 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
NTP NTP input
User Host (time is manually set by the user)
HAVEQUICK HAVEQUICK input
The number displayed indicates the number of feature inputs of that type presently installed in
the VersaSync– starting with “0” representing the first feature input. For example:
IRIG 0 = 1
st
IRIG input instance
Frequency 1 = 2nd frequency input instance
NTP 2 = 3rd NTP input instance
The columns of the Reference Priority table are defined as follows:
Priority—Defines the order or priority for each index (row). The range is 1 to 16, with 1
being the highest priority and 16 being the lowest priority. The highest priority ref-
erence that is available and valid is the reference that is selected.
Time—The reference selected to provide the necessary “Time” reference.
1PPS—The reference selected to provide the necessary “1PPS” reference.
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CHAPTER 3 • VersaSync User Manual Rev. 6.0
3.3 Managing References
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