The S7903E-S Switch Chassis is high performance, cost-effective Layer-3 switch with a large capacity. The S7903E-S is designed to operate at the core layer of small- and medium-sized networks, the convergence layer of large enterprise networks, and the convergence and access layers of metropolitan area networks (MANs). The S7903E-S have been optimized to meet users' diversified demands for devices used on these networks.