The Cisco 1-Port Channelized STM-1/OC-3 SPA addresses these needs by sharply reducing the amount of aggregation equipment and interconnectivity needed between edge and backbone routers. The SPA provides Cisco 6500 Switches, 7600 and 12000 Series Routers with support for T1/E1 aggregation. Designed for telcos and Internet service providers (ISPs), the SPA includes one OC-3/STM-1 port, which can be configured with multiple channels of nxT1, T1, fractional T1, or DS-0 in a SONET environment or nxE1, E1, fractional E1, or 64 kbps in an SDH environment.