Was used with a Mix plus system back in the day !The cable connects Digidesign HD I/O peripherals to an HD PCI card. 

• Length: 12 feet (approximately 3.66 meters).
• Color: Black.
• Compatibility: Designed for Pro Tools HD systems, connecting interfaces like the 888, 882, 1602, 192 I/O, and 96 I/O to a host Pro Tools HD PCI card.
• Chaining: It can also be used to chain multiple I/O units together, creating a single, clean DigiLink connection between multiple interfaces and the CPU. 
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• Have 2 for sale £120 each, 

The Avid Digidesign Pro Tools 888 TDM Digilink Cable 918003864 is a high-quality audio interface unit designed for professional musicians and DJs. Made by the well-known brand Digidesign, this cable is specifically designed for connecting audio equipment and musical instruments. Its TDM (Time Division Multiplexing) technology ensures reliable and high-quality sound transmission, making it an essential piece of equipment for those in the music industry seeking precision and professional audio performance.