Cisco QSFP-H40G-CU5M Compatible 40G QSFP+ DAC  - FSFS for Cisco compatible QSFP-H40G-CU5M 40G QSFP+ to QSFP+ direct attach cable operates over passive copper with a maximum reach of 5m, Cisco QSFP-H40G-CU1M Compatible 40G QSFP+ DAC  - FSFS for Cisco compatible QSFP-H40G-CU1M 40G QSFP+ to QSFP+ direct attach cable operates over passive copper with a maximum reach of 1m, 
Cisco 40GBASE QSFP Modules Data SheetThese breakout cables connect to a 40G QSFP port of a Cisco switch on one end and to four 10G SFP+ ports of a Cisco switch on the other end. Cisco currently 3m 40G QSFP+ DAC QSFP-H40G-CU3M - SFP CablesThe QSFPH40GCU3M is a Cisco QSFP-H40G-CU3M compatible direct-attach copper QSFP+ cable that's designed, programmed and tested to work with Cisco® brand Panduit Cable Ordering Guide For Cisco 40G OpticsThe QSFP-40G-SR4 module supports link lengths of 100 meters and 150 meters, respectively, on laser-optimized OM3 and OM4 multimode fibers