Compare Cisco (PA-8T-X21=) Expansion Module to Cisco (PA-VXC-2TE1=) Expansion Module

The PA-8T-X21 provides up to eight synchronous serial interfaces for the Cisco 7000 family routers and the Cisco uBR7200 series routers. PA-8T-X21 network interfaces provide a direct connection between the high-speed bus in the router and external networks. Each PA-8T-X21 interface provides full-duplex (FDX) operation at T1 (1.544 Mbps) and E1 (2.048 Mbps) speeds. The X.21 interface is commonly used in the United Kingdom to connect to public data networks.??All eight PA-8T-X21 interfaces connect to external networks through a single port that has a 200-pin, D-shell receptacle. You must use an X.21 compact serial cable to connect PA-8T-X21 interfaces to an external data service unit (DSU) or channel service unit (CSU). The compact serial cable attached to the single receptacle determines the mode (DCE or DTE) for all eight interfaces. Less

The enhanced digital voice port adapter provides large scale, high capacity voice, termination to PBXs and the PSTN for central site and large branch applications. With high density DSPs and two ports on each port adapter configurable for either T1 or E1, this card has the horsepower to deliver 60 channels of highly compressed voice for bandwidth sensitive WAN applications, and up to 120 channels of toll quality voice for large LAN and campus voice applications. Integrated multiservice interchange (MIX) provides flexibility for support of mixed environments including TDM voice, VoIP, and VoFR, that eases the path to end-to-end multiservice architectures. Less