Should, however, the above-mentioned higher threshold value no longer be exceeded, the unit
will remain in the 1200-second flywheel mode until either (a) the lower threshold value is no
longer exceeded, or (b) the 1200-second flywheel period expires. In both cases the PPS status
light will turn green again.
Smart reference monitoring is OFF by default. To turn it ON:
1.
Navigate to MANAGEMENT > OTHER: Disciplining.
2.
In the Status panel on the left, click the GEARicon. The Oscillator Settings window will
open.
3.
Check the box next to 1PPS Phase Validation and click Submit.
3.3.2.3 BroadShield
What is BroadShield?
BroadShield is an optional software module for NetC
lock that is capable of detecting the presence of GPS
jamming or spoofing in real time.
How BroadShield Works
BroadShield monitors the GPS signal frequency band
by applying proprietary error detection algorithms. If
a threshold signal monitoring value level is exceeded,
NetClock will emit a Major Alarm and – depending on
your system configuration – invalidate the GPS ref
erence causing NetClock to either transition into Hol
dover mode ("Holdover Mode" on page210), or go
out of sync.
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CHAPTER 3 • NetClock User Reference Guide Rev. 16
3.3 Managing Input References
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