This is a Mellanox® MFS4R12CB-050 compatible 40GBase-AOC QSFP+ to QSFP+ direct attach cable that operates over active MMF with a maximum reach of 50.0m (164.04ft). It has been programmed, uniquely serialized, and data-traffic and application tested to ensure it is 100% compliant and functional. Our direct attach cables are built to comply with MSA (Multi-Source Agreement) standards. All of our twinax and AOC cables are Trade Agreements Act (TAA) compliant. We stand behind the quality of our products and proudly offer a limited lifetime warranty.