In view of high-frequency signal, mechanical properties, electrical properties and environmental factors that change in the performance of cables and connectors, developers need a complete package of professional laboratory tests and certification programs to ensure the products that can meet the quality conditions and can perfectly show the functional characteristics. In this article about validation technique, Allion experts will introduce different specifications of USB and emphasize on certification. It will also concentrate on products with different interfaces such as SAS 4.0, PCIe’s latest specification of OCuLink interface, and fiber optic cable AOC (Active Optical Cable) and will explain each interface’s characteristics. In addition, we will also introduce some equipment and testing content focusing on electrical test, mechanical test, and environmental test.