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Looking further into this, it turns out that the SCC-68 is not compatible with the 6533 - it was made specifically for our E Series, M Series, and X Series multifunctionDAQ devices. While it does have digital front-end conditioning, it is not made for the high-speed digital IO devices. Sorry for the confusion.
Gary P. Applications Engineer National Instruments
If you are looking for the correct hardware to use, the SCB-68 (PN 776844-01) and the SH68-68-D1 Cable (PN 183432-02) are the hardware components that you need. Both of these products can be viewed on the pricing tab of the PCI-6533 product page.
I thought this might help.
Gary P. Applications Engineer National Instruments