Demand for high-capacity corporate backbones, for high-speed access to the global Internet, and for trunking connections for service provider internetworking has led to a growth in clear channel T3/E3 connections that has outpaced all other types and speeds of leased lines. This growth places tremendous strain on service providers and network managers to provision and manage new T3/E3 connections. The Cisco Clear Channel T3/E3 SPAs for the Cisco 7304, 7600, and 12000 Series routers offer high-density, highly manageable T3/E3 line connectivity and termination. With integrated line-interface data service units (DSUs) that allow T3/E3 lines to be directly terminated on a Cisco Systems router, the Cisco ClearChannel T3/E3 SPAs simplify T3/E3 line management, reduce provisioning costs, and make valuable rack space available.