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Reference for the User Interface
BER Bar
The BER bar displays the BER calculated during a period of 200 ms.
Error
This indicator turns red when errors are detected.
Stable errors are caused by the error add function: it turns
SFP/SMA Error Insertion Rate off.
Variable and high errors may be caused by faulty
connectors/cables. BERT connected to your device shows:
Stable or variable errors caused by your device. Correct the
problems with your device.
If the problems are not clear, then accumulate measurement
data and analyze the results.
Sync Loss
This indicator turns red when the measured BER is higher than the
sync threshold of 0.1.
The ED pattern does not match the incoming data pattern.
Patterns have lost sync.
The device connected to the BERT has inverted the data pattern.
The device has changed the data pattern.
NOTE
Error Detector can sync only PRBS patterns. Clock patterns cannot be measured
by the error detector, and will result in loss of synchronization.
N5980A User Guide 25