Today's global enterprise and service provider networks require diverse networking solutions to meet both economic and evolving connectivity needs. The demand for high-density, cost-effective solutions increases as corporate intranets expand to include more regional offices and increased numbers of remote and mobile users, while maintaining network requirements for scalability and improved price for performance. The Cisco Channelized T1/E1 SPA provides one of the greatest densities currently offered in the industry at 8 ports per SPA and up to 32 ports per SIP. At a cost per T1/E1 port less than that of a standard serial port with external channel service unit/data service unit (CSU/DSU), the Cisco Channelized T1/E1 SPA is cost-effective for all WAN connectivity. The Cisco Channelized T1/E1 SPA is designed to provide a full 8-port channelized solution for the Cisco 7600 Series Routers. The interfaces can be channelized, fractional, or unframed (E1) with up to 256 independent High-Level Data Link Control (HDLC) channels definable for T1 and E1 applications. With these capabilities, the Cisco Channelized T1/E1 SPA eliminates the need for separate interface types for separate connection requirements.