Single-chip 622-mb/s SDH/SONET framer, digital cross-connect and add/drop multiplexer solution

This paper presents a single-chip all-CMOS solution for 4 x OC-3c, OC-12, a nd OC-12c synchronous digital hierarchy/synchronous optical network (SDH/SO NET) framing with integrated serial line interfaces, Outstanding features o f this chip are clock and data recovery and fulfillment of ITU-T and Bellco re jitter requirements for SDH/SONET systems, as well as the large range of functions offered. These functions include asynchronous transfer mode (ATM ) and point-to-point protocol (PPP) support, as well as built-in native SDH /SONET functions such as digital cross-connect, add/drop multiplexing. and automatic protection sw itching. In addition, the chip is based on a new sc alable modular architecture.