40G QSFP+ port of a Cisco switch

The Cisco 40GBASE-CSR4 QSFP+ Module is similar to the 40GBASE-SR4 interface extends supported link lengths to 300m and 400m respectively on laser-optimized OM3 and OM4 multimode fiber cables. Each 10-gigabit lane of this module is compliant to IEEE 10GBASE-SR specifications. This module can be used for native 40G optical links over 12-fiber ribbon cables with MPO/MTP connectors, or in 4x10G mode with ribbon to duplex fiber breakout cables for connectivity to four 10GBASE-SR interfaces. Maximum channel insertion loss allowed is respectively 2.6dB over 300m of OM3 cable or 2.9dB over 400m of OM4 cable.isco QSFP+ to four SFP+ copper direct-attach breakout cables (Figure 3) are suitable for very short distances and offer a highly cost-effective way to connect within racks and across adjacent racks. These breakout cables connect to a 40G QSFP+ cable port of a Cisco switch on one end and to four 10G SFP+ ports of a Cisco switch on the other end. Cisco QSFP-H40G-​CU3M – Compatible Cisco 40GbE QSFP+ QDR Direct-Att​ach Copper Cable 3ml currently offers passive cables in lengths of 1, 3 and 5 meters, and active cables in lengths of 7 and 10 meters.