Spectracom SecureSync User Reference Manual page 178

3.6 OTHER Setup Pages
Major Alarm Active
Major Alarm Inactive
Unit Reboot
Timing System Software Error
Timing System Hardware Error
3.6.6.4 Setting GPS Minor and Major Alarm Thresholds
The GPS Events panel contains the definition of user-defined Minor and Major alarms for the
GNSS receiver falling below a user-specified number of GNSS satellites. SecureSync itself has a
pre-defined minimum number of satellites that must be tracked in order for GNSS to be considered
a valid reference. However, this section allows a user to setup alerts if SecureSync tracks less
than a user-specified number of satellites. This event can cause either a Minor or a Major alarm (or
both) to be asserted, depending on the configuration.
Each of the two Minor and Major alarms sections contains a field to define the desired threshold for
the minimum number of satellites that must be tracked that before the particular alarm is asserted.
Note that the GNSS receiver must initially be tracking more than the configured number of satel-
lites in order for this alarm to be triggered (the alarm is triggered when the receiver falls below the
minimum number specified).
The Duration Below Threshold (s) field provides the ability to define a period of time (in seconds)
that the GNSS receiver is allowed to fall below the minimum number of satellites before the par-
ticular alarm is asserted.
Figure 3-4:
To set the Minor Alarm Threshold and/or Major Alarm Threshold :
1.
If necessary, navigate to MANAGEMENT/OTHER/Notifications and choose the GPS
tab.
2.
At the bottom of the screen, locate the ALARM THRESHOLD panel.
3.
In the Minimum Satellites field enter the minimum number of satellites that must be avail-
able before the alarm is triggered. The alarm will be triggered when the number of satellites
available is BELOW this number.
4.
In the Duration Below Threshold(s) field, enter the time that the system must be below
the threshold set in the Minimum Satellites field before an alarm is triggered. The alarm will
be triggered when this time is reached.
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Alarm Threshold panel
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3 SecureSync User Reference Guide Rev. 18