Backed by 10Gtek 30 Days Free-returned, 3-Year Free Warranty and Lifetime Technology Support. 10Gtek is a manufacturer of Direct Attach Copper Cable, customized service also is available. In 10Gtek's Signal Integrity Lab, we 100% passed TDR & VNA tested. And each DAC Cable is individually tested on switches before delivery. 100% Compatible for Dell 470-ACEU. It is widely used in switch, router, server, NIC or other fiber optic equipments with 25GbE SFP28 ports for Network Attached Storage, Storage Area Network and High Performance Computing. 25G SFP28 DAC is the next logical migration from 10G to reduce the cost per Gbit/sec and provides 2.5 times the bandwidth of 10G using in the same SFP form factor. It is ideal for data center top of rack, wireless backhaul and enterprise interconnect applications. 25GBASE-CR SFP28 to SFP28 Direct Attach Copper Twinax Cable, Passive, 3-Meter(10ft), 28AWG.