The PA-8T-232 provides up to eight EIA/TIA-232 synchronous serial interfaces for Catalyst 5000 family switches (that use the Catalyst RSM/VIP2), Catalyst 6000 family switches (that use the Catalyst 6000 family Flex WAN module), Cisco 7000 series and Cisco 7500 series routers (that use the VIP2), Cisco 7100 series routers, and Cisco uBR7200 series routers. The EIA/TIA-232 interfaces provide a direct connection between the high-speed bus in the router and external networks. Each EIA/TIA-232 interface provides full-duplex (FDX) operation at the rate of 64 kilobits per second (kbps). The EIA/TIA-232 interface is most commonly used in the United States.