Probably the best way to check the cable would be to connect a device up and see if you can talk to it (like with a simple who). Are you having problems in your application that might lead you to believe that the cable is bad?
Simple Who does not work, and I just got the PCMCIA card back from NI. The problem I was having before (Card would not pass self test) is fixed, so I suspect that the cable may not be working properly.