Spectracom PRISMA VelaSync User Manual page 151

a.
b.
Note that Holdover mode does not persist through reboots or power cycles. If a reboot or
power cycle occurs while VelaSync is in Holdover mode, it will power-up and remain in a "
synchronized
again. While in this state, NTP will be Stratum 15 and outputs will not be usable. If the input ref-
erences are restored and then lost or declared not valid again, VelaSync will then go back into
Holdover mode.
What is "Holdover Timeout"?
Holdover Timeout is the user-configurable allowable time period in which VelaSync 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 recom-
mendations on how long (short) the Holdover Timeout should be.
How to configure Holdover Timeout
To set the Holdover Timeout value:
CHAPTER •
3 VelaSync User's Manual Rev. 1
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), VelaSync exits the Holdover mode and returns
to its fully synchronized state.
The Holdover Timeout period expires. In this case, VelaSync will declare loss of syn-
chronization.
" state until at least one valid Time and 1PPS input reference becomes available
Navigate to MANAGEMENT > OTHER: Disciplining , and click the GEAR icon in the Status
panel:
3.3 Managing References
not
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