40G QSFP+ Breakout DAC cable is built one end with 40G QSFP+ module and the other end breakout with four 10G SFP+ modules or four 10G XFP modules. It provides a cost effective way of connect 40 GbE QSFP+ ports to 4 x 10 GbE SFP+/XFP ports between servers, storage and other equipment over short distances. These DAC breakout cables support 40G Ethernet (40GBASE-CR4) and 10GBASE-CR4. They are fully compliant with the 40G QSFP+ MSA (Multi-Source Agreement) SFF-8431 and SFF-8436 specifications. 40G QSFP+ DAC breakout cables enable network professionals to achieve a high-end port density at lower cost and lower power consumption. AscentOptics could provide 40G QSFP+ to 4x 10G SFP+ breakout passive cables (0.5 meter to 7 meters) and active cables (1 meter to 10 meters), we can also supply passive 40G QSFP+ breakout to 4x 10G XFP cables in length range from 0.5 meter to 2 meters.