The Cisco Channelized T1/E1 Shared Port Adapter (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.Multilink Point-to-Point Protocol (MLPPP) is supported (in hardware) to enable link aggregation >T1. Up to eight individual T1s can be combined within a multilink bundle that appears to be a single IP link. This enables service providers to provision bandwidth >T1 incrementally, without requiring migration of the circuit and customer premises equipment (CPE) infrastructure to T3 facilities.The Cisco Channelized T1/E1 SPA is hot-swappable and supports service-transparent online insertion and removal (OIR), allowing removal of the SPA without impacting the interface processor and other SPAs.