The RP contains the central processing unit (CPU), the system software, and most of the memory components that are used in Cisco 2200 Signaling Controller. The Cisco SC2200 is the solution for many of the issues surrounding a conventional Primary Rate Interface (PRI) solution such as high interconnect costs and congestion from ever-growing Internet traffic.An upgrade (TCPROC-S-U) provides a 440MHz UltraSPARC II with 4MB L2 Cache CPU as a replacement for earlier RP versions. With the SC2200, Cisco is delivering its promise of the New World architecture. Providing an open solution that scales to PSTN size, performance, and reliability at a fraction of the cost of legacy switching systems that contributes to the bottom line immediately.