StarTech.com MSA Uncoded Compatible 3m 40G QSFP+ to QSFP+ Direct Attach Cable - 40 GbE QSFP+ Copper DAC 40 Gbps Low Power Passive Twinax - QSFP+ Direct-Attach Twinax cable complies w/ MSA industry standards - Copper Twinax Cable length: 3 m - Copper QSFP+ cables use cost effective copper compared to fiber - SFP cable low power consumption: < 0.1 W - Copper DAC cable is hot-swappable