Software And Hardware Implementation Of Time Synchronization System For The Switching Network

With the appearance of the new technology, new applications, new requirements, people want to have more saftive, reliable and truthly communication. Time information becomes one of identification to analyse the communication quality. So the applications of time synchronization in communication network become more and more important."This dissertation focuses on the software and hardware implementation of the time synchronization system for the switching network.The object of this research is base on one of the company development project, which is applied on site running. Together with my hard work on the key hardware board IETOD during design project process and lots of reference documents and papers about timing protocols and formuls during this paper researching process. In this paper,the theory,character and application sample of different timing protocol was studied and discussed. Finally,time synchronization solution,which applied on the communication network,was given and key technology was analyzed. The given solution can deal with the problem,which caused by the unsynchronization time between the different telecom user or different exchange device. It also can improve the QoS and manage quality of the telecom user. Now the hardware solution is applied on the first time synchronization network in China.The object of this research is:1.Research the related theory of time synchronization. Laid a strong emphasis on the research of the communication network requirement to time synchronization; requirement of time precision; study of goble international protocols, including time transmision and time synchronization protocols. 2 . Design and implementation time synchronization by hardware application. Based on the hardware circuit IETOD and application sample on Beijing TELCOM, Research key issues in hardware application.3 . Design and implementation time synchronization by software application.There have sevens chapters of this paper.Chapter 1 gives the decription of this research background and the research object, content etc.Chapter 2 introduces the ideas of time synchronization and time synchronization network at first. And analyze the different types application,character of different telecom services to make clear the importance of building the time synchronization network.Chapter 3 and chapter 4 defines the theory and technology of time synchronization (time synchronization technology and time transmission technology),popular time synchronization international protocols. It gives us the theory base to us.Chapter 5,Using IETOD board,which is an External Time Of Day module used in S1240 exchange, to show a hardware solution. And gives a strong proof to build a time synchronization network,considering the on site running condition.Chapter 6 shows a softerware solution,which used network manger system.Chapter 7 gives a conclusion and prospect.