This Arista AOC-Q-Q-40G-20M compatible 40GBase-AOC QSFP+ to QSFP+ direct attach cable (850nm, MMF, 20m) is a 100% compatible active-optical direct attach cable that operates at 850nm over multi-mode fiber, with a maximum reach of 20.00m (65.62ft). This Arista® compatible active-optical cable has been programmed, uniquely serialized, and data-traffic and application tested to ensure it is 100% compliant and functional. Our direct attach cable will initialize and perform identically to Arista's cable and is built to meet or exceed Arista's specifications, and comply with MSA (Multi-Source Agreement) standards. The actual part shipped may have a different part number, but will be functionally identical and 100% compatible. Trade Agreements Act (TAA) versions of this part are available.