The N281-01M-BK 40 GbE QSFP+ to 10 GbE SFP+ Passive DAC Copper Breakout Cable provides next-generation performance by connecting your 40 GbE QSFP+ system to four 10 GbE SFP+ servers, switches and/or adapters. It's ideal for connecting active network equipment in data centers, high-end servers and enterprise wiring closets. This one-meter hot-pluggable cable features zinc die-cast QSFP+ and SFP+ male connectors for superior EMI resistance, minimal insertion loss and low crosstalk for better performance. Ergonomic pull-tab ejectors make connecting to equipment a quick, easy task. Eight-pair wire technology is optimized for bandwidth-intense applications, including 40-Gigabit Ethernet (40GBASE-CR4), 10GBASE-CR4, 6G SAS, Fibre Channel and SONET.Flexible 30 AWG conductors maintain a smooth high-frequency response (20 GHz). The N281-01M-BK undergoes a rigorous assembly and testing procedure aimed at eliminating unnecessary signal loss. It's fully compliant with the MSA (Multi-Source Agreement) SFF-8431 and SFF-8436 architecture for guaranteed compatibility with all QSFP and QSFP+ ports. Compatible with SDR, DDR and QDR.