For introductory courses in electronic communications, data communications, and networking, as well as ECT, EET, and CET students. Written to introduce students to the fundamental concepts of electronic communications systems, data systems, and networks, this text provides extensive coverage of a wide range of data communications and networking issues while offering preliminary information on basic electronic communications and telecommunications systems. Topics explored include wireless and wireline telecommunications systems, basic data communications networks and systems, local area networks, internetworks, and the Internet including TCP/IP protocol suite.