Dell Networking 40GbE (QSFP+) to 4x10GbE SFP+ Passive Copper Breakout Cable, 3 Meters, Customer Install | Dell USA
Amazon.com: QSFP to SFP+ QSA Adapter 40G to 10G Converter Module for Mellanox MAM1Q00A-QSA, Dell 407-BBRO, Nokia 474938A, Juniper, Arista, H3C, Extreme and More Devices, All-Metal housing : Electronics