Description : This book present a detailed discussion on multiplexing techniques,multichannel data communication,puise code modulation,data modems,wireless communication systems, etc. in an easy to understand language.Asynchronous and synchronous datalink protocols,data transmission, modes,radio waves propagation vhf microwaves,VSAT and satellite communication links are explained in such a manner that students of science arts or commerce streams can understand these technical subjects easily.   Table of contents: Chapter 1         Fundamentals of  data communications Chapter 2         Transmission media Chapter 3         Data modems Chapter 4         Multichannel data communication Chapter 5         Computer networking fundamentals Chapter 6         OSI Model and TCP/IP suite Chapter 7         Data link protocol Chapter 8         Local area network Chapter 9         Wide area network Chapter 10        Data transmission networks Chapter 11        Wireless communications Chapter 12        Security and Privacy in computer networks