In addition, the book develops a generic digital switching system model that enables even the most inexperienced telecommunications engineers to quickly comprehend the basic architecture and functionally of digital switching systems.

Provides information on Asterisk, an open source telephony application.

The development of low-cost digital integrated circuits has brought digital switching from a concept to an economic reality. Digital switching systems have now found worldwide acceptance and there are very few new switch ing systems being considered either for design or application which are not digital. Digital technology has created new opportunities for innovation including the integration of digital transmission and switching, the combi nation of voice and data services in one switching entity, and the design of switching systems which are economical over a broad range of sizes. In the strict sense, the term "digital switching" refers to a system which establishes a message channel between two terminations where infor mation is represented in digital form. In more common usage, a digital switch usually contains a time-divided network composed of logic gates and digital memory to accomplish the switching function. The intent of this book is to provide an introductory level explanation of the principles of digital switching. These principles apply to both public and PABX switching. The book is aimed at those who apply, design, main tain, or simply wish to understand digital switching techniques. An electri cal engineering degree is definitely not required for comprehension. We have concentrated on explaining digital switching techniques without the use of detailed mathematics. However, each chapter contains a comprehen sive list of references which will lead the reader to sources for a more in-depth study of the many subjects covered.

7 -- Transmission Techniques 2717.1 Introduction 271; 7.2 Transmission Line Behavior 271; 7.3 Decibel Measurements 273; 7.4 Basic TDM Techniques and Digital Transmission Systems 274; 7.5 Plesiochronous Higher-Order Digital Multiplexing or PDH 279; 7.6 Synchronous Digital Multiplexing 281; 7.7 Optical Networks 287; 7.8 The Future 290; 8 -- Telecommunication Systems Testing 293; 8.1 Introduction 293; 8.2 Measurement Areas 293; 8.3 Measurement of Power Levels in Telecommunications Circuits 294; 8.4 High-Frequency Power Measurements 296.

This comprehensive and well-organized text discusses the fundamentals of electronic communication, such as devices and analog and digital circuits, which are so essential for an understanding of digital electronics. Professor Santiram Kal, with his wealth of knowledge and his years of teaching experience, compresses, within the covers of a single volume, all the aspects of electronics - both analog and digital - encompassing devices such as microprocessors, microcontrollers, fibre optics, and photonics. In so doing, he has struck a fine balance between analog and digital electronics. A distinguishing feature of the book is that it gives case studies in modern applications of electronics, including information technology, that is, DBMS, multimedia, computer networks, Internet, and optical communication. Worked-out examples, interspersed throughout the text, and the large number of diagrams should enable the student to have a better grasp of the subject. Besides, exercises, given at the end of each chapter, will sharpen the student's mind in self-study. These student-friendly features are intended to enhance the value of the text and make it both useful and interesting.

Do you have a pressing need to know about technical writing but don't know whom to ask or where to look? The Technical Writer's and Editor's Handbook provides a quick and easy way to answer your questions. Author Tom Wetzel draws from actual experiences of a successful technical writing career to explain the differences in various technical writing professions and the practical tools of the working technical writer's trade and their applications. Short, quickly digestible, and illustrated chapters support the development of technical proposals, training literature, magazine articles, technical advertisements, and press releases, as well as technical manuals and users' guides among other technical documentation. A practical day-to-day working tool, this guide and reference is an essential for the personal library of all practicing technical writers and other technical professionals including: a centsLogisticians a centsTechnicians a centsEngineers a centsManagers a centsStudents"