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While VersaSync is in Holdover, the only difference is the Holdover and associated Minor

alarm are asserted. There are no changes to NTP or any of the other outputs, i.e. while in

Holdover mode, NTP inside VersaSync continues to be at the same Stratum level it was at

before going into Holdover mode (such as Stratum1 when synced to GPS). Should the Hol-

dover period expire, however, or the unit is rebooted, the NTP Stratum will go to 16, pre-

venting 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:

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.

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

available again. While in this state, NTP will be Stratum15 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 adjusted according to application-specific requirements and preferences. See below for

recommendations 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. 7.0

3.3 Managing References

Orolia VersaSync User Manual

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