(The challenge of IP-based and large-granularity services has led to the fact that the metropolitan area network will gradually shift from mainly carrying the existing E1/STM-1 (2M/155M rate) TDM services to carrying FE/GE (10M/100M/1000M rate) IP services. Metro network technology needs to evolve from the existing "TDM circuit switching as the core" to "IP packet switching as the core" to evolve 3G and full-service competition, resulting in the metropolitan area network not only carrying 2G/3G voice and data services, but also carrying group Client and home business. The metropolitan area network needs to expand its scope and consider multi-service unified carrying for high-value services such as base stations and high-value group customers, and low-value services such as ordinary group customers and home broadband. It is necessary to reasonably choose networking technology to enhance the capacity for large-scale data services. Control and management of TD-SCDMA air interface precise clock and time synchronization requirements lead to the need for metropolitan area networks to provide higher-precision synchronization signal transmission capabilities. The cost of reconstructing the existing MSTP/SDH network is high, and the synchronization functions such as 1588v2 should be considered when building a new packetized metropolitan area network)
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