Increasing demand for bandwidth-intensive services and wide-area network (WAN) connectivity requires that network administrators maximize the capacity and efficiency of network routers. Cisco Systems High-Speed Serial Interface (HSSI) port adapter enables network administrators to leverage their investments in Cisco 7200, 7300, 7400, 7500 and 7600 Series Routers. This port adapter increases port density and enhances performance at the industry's lowest price per port.