The MikroTik 5m SFP+ 10Gbps Active Optics Direct Attach Cable [S+AO0005] is a highly cost-effective way to connect two SFP/SFP+ devices for very short distances, within racks and across adjacent racks. It works with all of MikroTiks products with SFP/SFP+ Ports, including new RB4011 series. (RB4011 series are not compatible with MikroTiks passive direct attach cables S+DA0001 and S+DA0003)