Alcatel-Lucent Compatible 40 Gigabit direct attached copper cable (3m, QSFP+) The Alcatel-Lucent QSFP-40G-C3M Compatible 40G QSFP+ Passive Direct Attach Copper Twinax Cable is designed for use in 40GBASE Ethernet. It provides a QSFP+ to QSFP+ copper direct-attach solution