RCx is a simple, high density, low cost, passive connector and cable system specifically designed for intra-rack connectivity of 25 Gb, 50 Gb and 100 Gb Ethernet allowing for a seamless intra-rack switch to adapter deployments. The streamlined design eliminates the need to include provision for active electrical components such as EEPROMs, optics, retimers, or management ICs. RCx is density optimized and can accommodate more than 128 25 G lanes in a RU faceplate. That leads two RCx2 receptables to fit on a half-height PCIe card faceplate or two Rcx4 to fit on a full-height PCIe card faceplate. Versatile, the 4-lane RCx4 receptacle can be used as a 4-lane port, or can be bifurcated to be used as multiple 2-lane and 1-lane ports.