Teledyne LeCroy LabMaster 9Zi-A - Manual (Page 60)

LabMaster 9 Zi-A
52 922157-00 Rev A
Gently pull the green tab on the cable plug to remove it.
PLEASE NOTE THE FOLLOWING:

PCIe 4 Lane Cable plugs are keyed with a single groove along one wide
side of the plug. The plug must be inserted into the socket with the
groove aligned properly.

If you are connecting less than four of the Slave Acquisition Modules, the
PCIe 4 Lane Data Inputs on the back of the CPU Modulemay not be
skipped and must be connected in consecutive order from the PCIe 4 Lane
Data Outputs on the back of the corresponding slaves.