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High-speed electrical interface compliant to the IEEE 802.3ba standard. Certified and tested on Cisco QSFP 40G ports for superior performance, quality, and reliability. Interoperable with other IEEE-compliant 40GBASE interfaces where applicable. Hot-swappable input/output device that plugs into a 40 Gigabit Ethernet Cisco QSFP port. Cisco 40GBASE-CR4 QSFP direct-attach copper cable, 2-meter, passive.