68-Pin VHDCI Male to 68-Pin VHDCI Male, 50 Ω, Shielded Digital Cable—The SHC68-C68-D4 Digital Cable connects NI 6535/6/7, 654x, 655x, and 657x digital instruments with other NI accessories like the CB-2162 Connector Block or SMB-2163 Terminal Block. You can also use it with certain Digital I/O Adapter Modules for FlexRIO, Digitizer Adapter Modules for FlexRIO, Signal Generator Adapter Modules for FlexRIO, and high-speed serial instruments. It is flexible and easily fits around custom test fixtures and other equipment. It is a shielded, 50 Ω cable and is offered in different lengths.