DigiLink cables connect a Pro Tools HD Series interface (Pro Tools | HD I/O, HD OMNI, and HD MADI) to a Pro Tools | HDX or HD Native core system, or to a second Series interface.
One 12-foot DigiLink cable is included with Pro Tools | HDX and Pro Tools | HD Native core purchases (for connection of the I/O to the CPU), and one 1.5-foot cable is included with each HD Series interface (for chaining multiple I/O units together). Purchased separately, longer DigiLink cables - 25', 50', 100'* and 200'*
