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).
GPS Antenna Problem: The GPS Antenna Problem alarm indicates the GNSS
receiver has detected an over-current or undercurrent condition (an open or short
exists in the GNSS antenna cable, or the GNSS antenna is not connected to Ver-
saSync). The receiver will attempt to continue the normal acquisition and tracking
process regardless of the antenna status. The current draw measurements that will
indicate an antenna problem are:
Under-current indication < 8 mA
Over-current indication > 80 mA
Note: This alarm condition will also be present if a GNSS antenna splitter
that does not contain a load to simulate an antenna being present is being
used.
GPS Antenna OK: The antenna coax cable was just connected or an open or short
in the antenna cable was being detected but is no longer being detected.
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.
Frequency Error cleared:The Frequency Error alarm was asserted but was then
cleared.
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 Time and 1PPS 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.
244
CHAPTER 4 • VersaSync User Manual Rev. 7.0
4.6 Quality Management
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