period expire, however, or the unit is rebooted, the NTP Stratum will go to 16, preventing any
clients from being able to sync with VersaSync until GPS or another reference has been
restored.
How long will the unit remain in Holdover mode?
VersaSync will remain in Holdover mode until either:
a.
Any enabled and valid input reference becomes available again: If one or more ref-
erences return and are declared valid before the Holdover period has expired (even
momentarily, i.e. for at least one second), VersaSync exits the Holdover mode and
returns to its fully synchronized state.
b.
The Holdover Timeout period expires. In this case, VersaSync will declare loss of syn-
chronization.
Note that Holdover mode does not persist through reboots or power cycles. If a reboot or
power cycle occurs while VersaSync is in Holdover mode, it will power-up and remain in a
“not synchronized” state until at least one valid Time and 1PPS input reference becomes avail-
able again. While in this state, NTP will be Stratum15 and outputs will not be usable. If the
input references are restored and then lost or declared not valid again, VersaSync will then go
back into Holdover mode.
What is "Holdover Timeout"?
Holdover Timeout is the user-configurable allowable time period in which VersaSync remains
in Holdover mode before it declares loss of synchronization. Holdover Timeout can be adjus-
ted according to application- specific requirements and preferences. See below for recom-
mendations on how long (short) the Holdover Timeout should be.
How to configure Holdover Timeout
To set the Holdover Timeout value:
Navigate to MANAGEMENT > OTHER: Disciplining, and click the GEAR icon in the Status
panel:
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CHAPTER 3 • VersaSync User Manual Rev. 6.0
3.3 Managing References
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