hybrid QSFP+ Passive Copper are compliant with

I have two Dell MXL blades [FTOS 8.3.16.2] in a M1000e chassis with a MXL blade in slot A1 and slot A2 as shown below. The ‘fortyGigE 0/33′ port on each switch is connected to the other via a 40 GbE QSFP+ Passive Copper. Dell MXL blade switches support both ring and daisy chain topologies. In this example, I simply daisy chain two MXL blades to create one logical switch that can be managed as one unit. In a typical scenario, VLT can then be employed from two ToR switches down to the MXL stack using the two free fixed 40GbE ports; however, I do not demonstrate this VLT configuration here. To see VLT configuration see my prior blog
Movement to QSFP and XFP show density in the datacenter on the rise! 10/100 Gbps are making inroads, particularly within the rack and across the datacenter. Long range 40Gbps is 4 trunked 10 Ge links, either MO4 fiber or extended range out to 3000 Meters - that’s 1.86 miles. QSFP+ Passive Copper allows 2x 10Ge fiber connections (fiber count of 4) connections in a single plug switch-side with a split tail host-side. That is 1 cable for 2x 10Ge drops from host to switch.  That just cut a typical cabling load in the rack in 1/2.  Choose QSFP+ Passive Copper for even more affordable cabling! Did someone say 10Gbps over copper? Boy, the photons must be getting scared. For another reference