Whilst the principles underlying the design of the transmission and terminal components of telecommunication systems are well established, those of the switching centre components are not. One major objective of this book is to restore the balance and develop a coherent set of principles for the design of switching systems.
The treatment is based largely on public telephone systems, world-wide, since it is in this 350 million terminal network that the principles have evolved. However, the principles are shown to apply equally to other types of switching systems such as data networks, video systems and private telephone networks.
The majority of switching equipment in public use today is still built from electro-mechanical components such as relays, and part of this book describes their applications. However, the use of computers and, more recently, micro-processors is bringing a revolution in the design of switching systems, and a significant proportion of the book is devoted to them. Nevertheless, it is suggested that some of the earlier design of computer-controlled switching centres might have benefited from the full adoption of electro-mechanical design principles.
The book should be of value to the engineer with training in electronic engineering, computer systems or conventional switching and needing to understand the design and operation of a switching system. The only background assumed is knowledge of basic electronics and some familiarity of computers and programming. Such topics as electro-mechanical switching technology, with which the reader may be unfamiliar, are described in full.