The High-Speed Serial Interface (HSSI) port adapters (PA-H and PA-2H) are available on Cisco 7200 series routers, on second-generation Versatile Interface Processors (VIP2s) in Cisco 7500 series routers, and on Cisco 7000 series routers with the 7000 Series Route Switch Processor (RSP7000) and 7000 Series Chassis Interface (RSP7000CI).The PA-H provides one high-speed synchronous serial interface and the PA-2H provides two high-speed synchronous serial interfaces that support full-duplex and data rates up to 52 Mbps.