Cisco QSFP to QSFP copper direct-attach cables are suitable for very short distances and offer a highly cost-effective way to establish a 40-Gigabit link between QSFP ports of Cisco switches within racks and across adjacent racks. Cisco currently offers passive cables in lengths of 1, 3 and 5 meters. Product Name: 1M Cable Passive Cop 40GBASE-CR4 Product Type: Network Cable Connector on First End: 1 x Male QSFP Connector on Second End: 1 x Male QSFP Color: Tangerine Product Model: QSFP-H40G-CU1M Device Supported: Network Device Cable Length: 3.28 ft Compatibility: Cisco 40GBASE-SR4 QSFP Copper Module Conductor: Copper