The 400G QSFP56-DD AOC is a Eight-Channel, Pluggable, Parallel, Fiber-Optic QSFP Double Density for 2x200 Gigabit Ethernet Applications. Explore Amphenol's high-speed Active Optical Cables designed for data centers, HPC, telecom, and storage systems with support from 12G to 400G. JTOPTICS® 400G QSFP-DD AOC (active. Arista's 400G platforms allow data centers and high-performance computing environments to address growing needs for higher bandwidth at lower cost and power per gigabit. Key benefits include: Increase switching bandwidth by a factor of 4.