Note: For an effective jamming detection, and – to some extent – spoofing detec
tion, a good antenna placement with optimal sky view resulting in a high signal-to-
noise ratio is essential. A strong signal is required to discern between normal sig
nal fluctuations and a non-natural divergence of signal strength.
Even if you decide to turn off NetClock's Auto Sync Control feature, which allows BroadShield
to disable the GNSS reference, BroadShield still adds value to your overall system capability
by telling you (a) if your GNSS receiver is being spoofed, and (b) in the event of a signal loss
due to jamming, why the signal is lost. Also, if a normally strong GNSSsignal becomes
weakened, BroadShield's algorithms are capable of discerning a jamming event from natural
events causing the signal to weaken.
BroadShield Requirements
In order for BroadShield to work on your NetClock system, the following requirements must be
met:
1.
The optional BroadShield software license needs to be enabled by applying the OPT-
BSH BroadShield license key. For more information, contact your local Spectracom
Sales Office. To determine if BroadShield has been activated on your NetClock unit,
navigate to TOOLS: SYSTEM > Upgrade/Backup. The center panel System Con
figuration will list the Options installed in your unit.
2.
BroadShield only works with a u-blox M8T receiver, not with Trimble receivers. To
determine which receiver is installed in your unit, navigate to TOOLS: SYSTEM >
Upgrade/Backup. The center panel System Configuration will list the GNSS Receiver
installed in your unit.
3.
System Software 7.5.1 or higher must be installed in your unit. To determine which soft
ware is installed in your unit, follow the instructions above and locate the System line
item in the System Configuration panel.
Activating the BroadShield License
If you have purchased the BroadShield license key and now want to activate it, please follow
the instructions under "Applying a License File" on page312.
To confirm that BroadShield has been activated on your NetClock unit, navigate to TOOLS:
SYSTEM > Upgrade/Backup . The center panel System Configuration will list the Options
installed in your unit.
Enabling/Disabling the BroadShield Service
The Broadshield service can be run in two operating modes:
BroadShield only: In the event jamming or spoofing is detected, NetClock will emit a
Major Alarm, however it will continue to consider the GNSS reference as valid, i.e. it
will NOT go out of sync.
3.3 Managing Input References
CHAPTER 3 • NetClock User Reference Guide Rev. 16
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