I'm working on a network design in space constrained cabinets and trying to minimize the amount of cable coiled in the racks. The network is using HP A5820 switches and running 10Gigabit Ethernet to the servers in the rack. Is there a minimum cable length that I can use? The minimum length that HP sells is .65 meters but we'd like to have another vendor build us shorter cables if the Ethernet spec supports this. Does anyone know the spec that governs SFP+ to SFP+ Direct Attached Cables (DAC) for 10G? Does anyone have experience with cables shorter than 1 m?