Under the GPSEvents tab, you can also configure Minor and Major AlarmThresholds for GNSS
fault events; see "Configuring GPS Notification Alarm Thresholds" below.
4.2.2.3 System Tab: Events
Minor Alarm Active
Minor Alarm Inactive
Major Alarm Active
Major Alarm Inactive
Unit Reboot
Timing System Software Error
Timing System Hardware Error
High Temperature, Minor Alarm
High Temperature, Minor, Cleared
High Temperature, Major Alarm
High Temperature, Major, Cleared
4.2.3 Configuring GPS Notification Alarm Thresholds
SecureSync allows you to configure Minor and Major alarm thresholds for the GNSS receiver.
This is done by setting the minimum number of satellites the receiver can track for a set time
before an alarm is triggered. If both conditions are met, i.e. the reception quality falls below
the set number of satellites for the set amount of time, an alarm is triggered.
The alarm notification feature described below allows you to be notified of a potential recep-
tion issue BEFORE the GNSS reference becomes invalid. This may be useful e.g., to notify sys-
tem operators of a deteriorating signal reception before SecureSync loses the GNSS
reference.
Note that SecureSync itself has a pre-defined minimum number of satellites that must be tracked
in order for GNSS to be considered a valid reference. The minimum number of satellites
depends e.g., on your receiver mode, the GNSS signal reception in the area where your
antenna is located, and the type of receiver in your unit. In Stationary mode, and for SAASM
units, the minimum number of satellites is normally 4 (four). Hence, it would be prudent to set
the Minor Alarm Threshold to 8, and the Major Alarm Threshold to 6.
Note: While GPS Notification Alarms can be used in Mobile GNSS receiver mode,
it is not advisable.
4.2 Notifications
CHAPTER 4 • SecureSync User Reference Guide Rev. 26
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