Teledyne LeCroy PETracer Summit and Summit T2-16 PCIe User Manual - Manual (Page 137)

Summit User Manual Chapter 8: Recording Options
Teledyne LeCroy
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Disable Descrambling: If checked, causes the Analyzer to assume that none of the
PCI Express traffic is scrambled. By default, the Analyzer determines the scrambling
state of the devices under test.
Auto-Configure Lane Polarity: Lets the Analyzer determine lane polarity. 
(Not available for Bit Tracer Recording)
Base Spec 1.0 Rev Compatibility Mode (Advanced Mode): This option causes the
Analyzer to conform to the PCI Express 1.0 Specification.
Speed: Speed can be Auto, 5.0 GT/s, or 2.5 GT/s for the Snapshot, Manual Trigger, and
Event Trigger recording types, and 5.0 GT/s or 2.5 GT/s for the Bit Tracer Recording
recording type.