5m SFP 10Gbps Active Optics direct attach cable. This is highly cost-effective way to connect two SFP/SFP devices for very short distances, within racks and across adjacent racks. It works with all our products with SFP/SFP ports, including new RB4011 series (RB4011 series are not compatible with our passive direct attach cables S DA0001 and S DA0003)