For each type of log, four 75KB files are maintained internally on a revolving basis, i.e. the
oldest file will be overwritten, as soon as all four files have filled up with event data. The life
expectancy of a log file depends on the amount of data accumulating over time: Some
types of logs will fill up within days, while others can take months until they have reached
their maximum storage capacity.
You can delete logs at any time, see .
4.5.2.1 Types of Logs
SecureSync generates log files for the following event categories:
Alarms Log
Displays log entries for the Timing System, for example:
The Unit has Rebooted: SecureSync was either rebooted or power cycled.
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: SecureSync is synchronized to its selected Time and 1PPS reference
inputs.
Not In Sync: SecureSync 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 frequency error
was too large. Or, the frequency couldn’t be measured because a valid input ref-
erence was not available.
Reference change: SecureSync has selected a different Time and 1PPS input ref-
erence for synchronization. Either the previously selected input reference was
declared not valid (or was lost), so a lower priority reference (as defined by the Refer-
ence Priority Setup table) is now selected for synchronization OR a valid reference
with higher priority than the previous reference 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. SecureSync is
synced to GNSS and so GNSS is the selected reference. The GNSS antenna is disconnected and
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CHAPTER 4 • SecureSync 2400 User Manual Rev. 2
4.5 Quality Management
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