Cisco PA-T3

The PA-T3(=) serial port adapter is a single-width, one-port module that integrates data service unit (DSU) functionality into the Cisco router. The PA-T(=) provides one high-speed serial PA-T3 interface on Cisco 7100 series routers, Cisco 7200 series routers, Cisco uBR7200 series routers, Cisco7301 routers, Cisco7304 PCI Port Adapter Carrier Card in Cisco 7304 routers, Cisco7401ASR routers, on the Versatile Interface Processor (VIP) in all Cisco 7000 series and Cisco7500 series routers, on the Catalyst6000 family FlexWAN module in the Catalyst6000 family switches, and on the CatalystRSM/VIP2 in the Catalyst5000 family switches. The PA-2T3(=) serial port adapter is a single-wide, two-port module that integrates DSU functionality into the Cisco router. The PA-2T3(=) provides two high-speed serial PA-T3 interfaces on Cisco7100 series routers, Cisco 7200 series routers, Cisco uBR7200 series routers, Cisco 7301 routers, Cisco7304 PCI Port Adapter Carrier Card in Cisco 7304 routers, Cisco7401ASR routers, on the second-generation VIP in all Cisco 7000 series and Cisco7500 series routers, on the Catalyst6000 family FlexWAN module in the Catalyst6000 family switches, and on the Catalyst RSM/VIP2 in the Catalyst5000 family switches. Serial network interfaces reside on modular port adapters, which provide a direct connection between the high-speed bus in the router and the external networks. The PA-T3 provides a full-duplex synchronous serial PA-T3 interface for transmitting and receiving data at rates of 44-45 megabits per second (Mbps) depending on the framing used. The PA-T3 supports both 16- and 32-bit cyclic redundancy checks (CRCs). The default is 16-bit CRCs. To enable 32-bit CRCs, use a configuration command.