This text, 'Telecommunication Switching and Networks' is intended to serve as a one-semester text for undergraduate course of Information Technology, Electronics and Communication Engineering, and Telecommunication Engineering. This book provides in depth knowledge on telecommunication switching and good background for advanced studies in communication networks. The entire subject is dealt with conceptual treatment and the analytical or mathematical approach is made only to some extent. For best understanding, more diagrams (202) and tables (35) are introduced wherever necessary in each chapter.

The telecommunication switching is the fast growing field and enormous research and development are undertaken by various organizations and firms. The communication networks have unlimited research potentials. Both telecommunication switching and communication networks develop new techniques and technologies everyday. This book provides complete fundamentals of all the topics it has focused. However, a candidate pursuing postgraduate course, doing research in these areas and the employees of telecom organizations should be in constant touch with latest technologies. For this purpose, in each chapter end, the related websites, which provides sufficient informations's, are added.

Also, the subjects like signalling techniques, traffic engineering, billing and charging procedure, telecommunication system organizations are subject to changes according to the govt. policies and changing scenario in the economy of the country, political changes, pressures from people etc. Hence, the viewers of this subject should have constant touch with changes. For this purpose also, the related websites are added at all the chapters end.

Chapters 1, 2, and 3 are introductory chapters. A reader having previous exposure to these topics may start from the fourth chapter. Chapter 1 introduces the historical development of the subject. Chapter 2 deals with the telecommunication standards organizations and the standards, which are useful to provide worldwide telecom services with better interconnectivity. The telephone systems, transmission systems and the impairments related to the transmission of signals are described in the chapter 3. Also, the study of section 3.6 will be highly useful in understanding of digital switching and transmission.

Entire 4th chapter discusses the evaluation of PSTN, electromechanical switching system, SPC exchanges those are basics for digital switching systems, various switching procedures and the components used in switches.

Chapters 5 and 6 deal with the digital switching and computer controlled switching procedures and some currently available switching systems are discussed.

Chapter 7 concentrates on signalling techniques. The signalling system enables the quick path setup between calling and called subscribers. Chapter 8 is completely devoted to traffic engineering that covers various systems and blocking models. Chapter 9 helps the viewer to understand the numbering plan, charging and how to organize an exchange.

Chapters 10, 11 and 12 are devoted completely to communication networks. Chapter 10 deals with DSL technologies and SONET/SDH networks. The chapter 11 gives idea about OSI

model, TCP/IP and ATM concepts. Chapter 12 is devoted to ISDN which is a network that supports various voice/data transfer related services.

For this book, I am greatly indebted to Dr. S.P.E. Xavier, who urged me and encouraged me to write it. I am pleased to acknowledge Mr. R. Vijayarajan, of my department who reviewed the manuscript and rendered valuable suggestions. I am indebted to Prof. A. Sivasubramanian, Head of ECE who has rendered his most gracious encouragement and very valued criticism. I express my thanks to the faculty members of my department and friends for their suggestions and encouragement. I thank Mr. A. Antony Rajasekar, Asst. Librarian for his help in identifying the books for reference.

I express my sincere gratitude to our chairman Thiru. Jeppiaar, M.A., B.L., Chancellor, Sathyabhama Institute of Science and Technology (Deemed University). I extend my thanks to the directors Dr. B. Babu Manoharan, M.A., Ph.D., and Tmt. Sheila Babu Manoharan, M.A., B.L., and the Principal Prof. Jolly Abraham of St. Joseph's College of Engineering, Chennai for their constant encouragement. My wife Malathi and my son Tinu Rahul sacrificed in many ways to bring this book out. My wife took care of my personal needs and family needs and her support and encouragement made publishing of this book possible.

Assistant Professor St. Joseph's College of Engineering Chennai-600 119

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