Held, Gilbert <br/><br/>
Understanding data communications / 
Gilbert Held 
 - Fourth Edition. 
 - Indianapolis, Indiana :  Sams Publishing,  c1994 
 - xvii, 435 pages :  illustrations ;  24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/>1. An Overview of Data Communications -- 2. Terminal Devices -- 3. Messages and Transmission Channels -- 4. Asynchronous Modems and Interfaces -- 5. Synchronous Modems, Digital Transmission, and Service Units -- 6. Multiplexing Techniques -- 7. Fiber-Optic and Satellite Communications -- 8. Protocols and Error Control -- 9. Personal Computer Communications Software -- 10. Alternatives in Local Area Networks -- 11. Architectures and Packet Networks -- 12. Network Design and Management -- 13. ISDN. 
<br/><br/> This text teaches digital communications, the inner workings of data terminals, modems, fibre optics and satellites. It covers the fundamentals, the functions of data terminals and their components and the latest network architecture and design techniques. 
<br/><br/><label>ISBN: </label>672305011 
<br/><br/><label>Subjects--Topical Terms: </label><br/>DATA TRANSMISSION SYSTEMS
<br/><br/><label>LC Class. No.: </label>TK 5105 .H45 1994