Copper QSFP+ Cable | 40 Gbps | Active DAC | Lifetime Warranty. This 40G QSFP+ cable delivers what you need most in your network connections: reliable performance. It's built to MSA specifications and fully tested to ensure seamless compatibility. The active twinaxial cable is a fully hot-pluggable solution, supporting 40 Gigabit Ethernet applications connected through QSFP+ (Quad Small Form-Factor Pluggable) ports. Designed for high-speed interconnects, this cable is intended for medium-distance applications such as across rack network switch or server connections. Backed by a StarTech.com lifetime warranty, the QSFPH40GAC10 is a reliable replacement cable for the Cisco QSFP-H40G-ACU10M.