TAILIEUCHUNG - Signaling System No.7 Protocol Architecture And Sevices part 1

Chapter 1. The Evolution of Signaling This chapter is intended to provide a sound introduction to the world of telecommunications signaling. It is particularly written for those readers who have little or no signaling knowledge. | Chapter 1. The Evolution of Signaling This chapter is intended to provide a sound introduction to the world of telecommunications signaling. It is particularly written for those readers who have little or no signaling knowledge. It provides a solid foundation to help you grasp signaling ideas concepts terminology and methods. A strong foundation will provide the novice reader with a better understanding of the book s main topic Signaling System No. 7. Today Signaling System No. 7 is the most advanced and widely used signaling system for both cellular and fixed-line telecommunications networks. This chapter covers the following topics What signaling is and why it is relevant Overview of subscriber and network signaling The history of signaling and the development of the Public Switched Telephone Network PSTN Overview of the Channel Associated Signaling CAS method of signaling and its common implementations Overview of the Common Channel Signaling CCS method of signaling and its operational modes The limitations of CAS and CCS Signaling System No. 7 known more commonly in North America as SS7 and elsewhere as C7 is both a network architecture and a series of protocols that provide telecommunications signaling. In order to begin studying SS7 you must first learn what telecommunications signaling is by studying its origins and purpose. The ITU-T defines signaling as 47 The exchange of information other than by speech specifically concerned with the establishment release and other control of calls and network management in automatic telecommunications operation. In telecommunications the network s components must indicate that is signal certain information to each other to coordinate themselves for providing services. As such the signaling network can be considered the telecommunications network s nervous system. It breathes life into the infrastructure. Richard Manterfield author of Telecommunications Signaling has stated this poetically 103 Without signaling networks

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