In Holdover: Input references were available, but all input references have
since been lost. If the references are not restored before the Holdover
period expires, time sync will be lost.
No longer in Holdover: Input references were lost at one point (or declared
not valid), but have since been restored OR the Input references were not
restored before the Holdover period expired (Time Sync alarm is asserted).
In Sync: VersaSync is synchronized to its selected Time and 1PPS reference
inputs.
Not In Sync: VersaSync is not synchronized to its Time and 1PPS inputs and
is not currently in Holdover. NTP will indicate to the network that it is
Stratum 15 and so the time server likely be ignored as a time reference.
Frequency Error: The oscillator’s frequency was measured and the fre-
quency error was too large. Or, the frequency couldn’t be measured
because a valid input reference was not available.
Reference change: VersaSync has selected a different Time and 1PPS input
reference for synchronization. Either the previously selected input ref-
erence was declared not valid (or was lost), so a lower priority reference (as
defined by the Reference Priority Setup table) is now selected for syn-
chronization OR a valid reference with higher priority than the previous ref-
erence is now selected for synchronization.
E X A M P L E :
GNSS is the highest priority reference with IRIG input being a lower priority. VersaSync
is synced to GNSS and so GNSS is the selected reference. The GNSS antenna is dis-
connected and IRIG becomes the selected reference. The Reference change entry is
added to this log.
Authentication Log
Displays log entries for authentication events (e.g., unsuccessful login attempts,
an incorrectly entered password, etc.) that are made to VersaSync’s command
line interfaces (such as telnet, SSH, FTP, etc.).
Events Log
Displays log entries related to GNSS reception status changes, Sync/Holdover
state changes, SNMP traps being sent, etc. Examples include:
Reference Change: VersaSync has switched from one input reference to
another (for example, IRIG was the selected input being used, but now
GNSS is the selected reference).
4.6 Quality Management
CHAPTER 4 • VersaSync User Manual Rev. 12
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