Keysight Technologies U4301 User Manual page 30

3 Specifying the Connection Setup
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Specify any lane polarity inversion:
a Click Auto or Manual to toggle between the types of polarity inversion specification.
When Auto is selected, the polarity of the lanes is set automatically during the initial link
training.
b When manual selection is chosen, select the lanes that are inverted.
Keysight U4301 PCIe Gen3 Analyzer User's Guide