This new book is an introduction to modern communications networks that now rely far less on telephone services and more on cellular and IP networks. The resource is designed to provide answers to the fundamental questions concerning tele--communications networks and services. This includes the structure and main components of a modern telecommunications network; the importance of standardization; and how cellular mobile networks oberate; among many others. In addition, you are provided with problems and review questions to work though and help you master the material. Market Executives, managers, sales staff in telecom companies; Students & engineers