Design And Implementation Of FPGA In The Telephone Switch System

Since the reform and open policy is applied in China, our country has made great achievements in the telecommunication field, the metropolitan network has developed rapidly. The most attractive thing is that the Digital Program Control Switch System is widely applied, which is the foundation of the digitalization for the whole network. The Digital Program Control Switch System, which based on the circuit switch, is still the main means of telecommunication field and plays an important role in the telecom network system.Since some telephone switch systems have special requirements, it is a very promising subject to provide a universal solution not only realize the functions , but also satisfy the demand of dependability, extending ability, and capacity. FPGA (Field Programmable Gate Array) could satisfy the demand of switch network because of its high integration and performance. Meanwhile, it also offers the function of state detection, voice record, software dialup, extending ability and so on.This thesis analyzes the current design of the popular switch systems in the market according to the special requirement of the system. Then it compares some main switch techniques and chooses FPGA as the implementation method of the switch function. After that, it describes the working flow of every module in the system and the inner module division of the FPGA. FPGA should not only implement the voice slot switch function, but also communicates with the interface module, caller-ID analyzing module and controlling module. At the end of the design, the test scheme and the debugging results are introduced. Then the thesis is summarized, some functions models which need consummating are presented, the prospect of the switch technology is discussed. With the module design method, the solution meets the extention and transplantation requirements and could be the reference model to other systems.