[URGENT] Diagnosing problem in PCIe-8375 card or fiber optic cable

[yejus]

I have a PXIe-8375/PCIe-8375 interface system for connecting my PC to a PXI chassis with several PXI cards. The PXIe-8375 is connected to the PC with an MXI express Fiber Optic cable. Recently, I've been having a problem where the PXI cards in the chassis don't show up on the PC, and the LED indicator on the PXIe-8375 interface card is amber, meaning the connection to the PC is lost. I'm trying to narrow down the problem to either the PCIe-8375 card or the fiber optic cable. 

Is there a way to determine which component is not working? I don't have any spare components to test with. On Device Manager, with the PCIe card connected, this is the result under "System Devices":

The "PCI Express to PCI/PCI-X Bridge" devices are translucent or "hidden", which means they are not connected. Does this definitely mean the PCIe card is malfunctioning? I'd be grateful if someone offered any help.

[Robert__R]

Hi yejus,

Unfortunately there's not a good way to tell which piece is broken. You may want to verify the DIP switches -- enabling BIOS mode without the driver installed will yield symptoms like this. You could try installing the driver in case something's wrong with the DIP switch: https://www.ni.com/en-us/support/downloads/drivers/download.mxi-express-bios-compatibility.html#3311...

In device manager, if you view devices by connection, the PCIe MXI card will show up as an upstream port and a downstream port, and the PXIe board would show up as an upstream port and several downstream ports. You'll probably see the upstream+downstream pair for the PCIe card but that doesn't really narrow it down -- all 3 pieces need to be working for the cabled link to function.

XYZ PCI Express Root Port
  PCI Express Upstream Switch Port (PCIe card)
    PCI Express Downstream Switch Port (PCIe card)
[cable]
      PCI Express Upstream Switch Port (PXIe card)
        PCI Express Downstream Switch Port (PXIe card)
        PCI Express Downstream Switch Port (PXIe card)
        ...