Spectracom NetClock 9489 - System Tab: Events; Configuring GPS Notification Alarm Thresholds

GPS Antenna Problem
GPS Antenna OK
GPS Receiver Fault
GPS Receiver Fault Cleared
Under the GPSEvents tab, you can also configure Minor and Major AlarmThresholds 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
NetClock 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 NetClock possibly losing the GNSS
reference.
Note that NetClock 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 (see "Selecting a GNSS Receiver Mode" on page189), the GNSS
signal reception in the area where your antenna is located, and the receiver type. For SAASM
units and in Stationary Mode, the minimum number of satellites is normally 4 (four). Hence, it
would be suggested to set the Minor Alarm Threshold to 8, and the Major Alarm Threshold to
6.
4.2 Notifications
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