This is an MSA compliant 56GBase-CU QSFP+ to QSFP+ direct attach cable that operates over passive copper with a maximum reach of 4.0m (13.1ft). 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. This direct attach cable is TAA (Trade Agreements Act) compliant. We stand behind the quality of our products and proudly offer a limited lifetime warranty.