Spectracom SecureSync User Reference Manual page 273

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 IRIG becomes the selected reference. The Reference change entry is added to this log.
Timing Log
Displays log entries related to Input reference state changes (for example, IRIG input is not con-
sidered valid), antenna cable status. Examples include:
GPS Qualification Log
If SecureSync is connected to a GNSS antenna and is tracking satellites, this log contains a run-
ning hourly count of the number of GNSS satellites tracked each hour. This history data can be
used to determine if a GNSS reception problem exists and whether this is a continuous or inter-
mittent reception issue.
GNSS reception may be displayed as cyclic in nature. A cyclic 12 hour pattern of decreased
GNSS reception typically indicates that the GNSS antenna has an obstructed view of the horizon.
The GNSS satellites are in a 12-hour orbit, so if part of the sky is blocked by large obstructions, at
the same time every day (at approximately 12 hour intervals), the GNSS reception may be reduced
1
GR = GNSS Reference
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4 SecureSync User Reference Guide Rev. 18
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 cur-
rently 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 reference was not
available.
Reference change : SecureSync has selected a different Time and 1PPS input reference
for synchronization. Either the previously selected input reference was declared not valid
(or was lost), so a lower priority reference (as defined by the Reference Priority Setup table)
is now selected for synchronization OR a valid reference with higher priority than the pre-
vious reference is now selected for synchronization.
GRGR = GNSS Reference
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 SecureSync).
The receiver will attempt to continue the normal acquisition and tracking process regardless
of the antenna status.
GR antenna ok : The antenna coax cable was connected at this time or an open or short in
the antenna cabling was occurring but is no longer being detected.
1
antenna fault : The GNSS Antenna Problem alarm indicates
4.11 Logs
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