here you are the pinout:
Pin 1 on PXI side: Tx+ -> pin 5 on other side.
Pin 6 on PXI side: Tx- -> pin 9 on other side.
Pin 5 on PXI side: Rx+ -> pin 1 on other side.
Pin 9 on PXI side: Rx- -> pin 6 on other side.
The MXI-4 link has a DB9 connector which has only four pins populated.
It looks like the specification is very similar to these Fibre Channel cables made by Amphenol:
Thank you for your help,