Freeman, Roger L. Practical data communications / [Book]. Roger L. Freeman. - New York : John Wiley and Sons, 1995. - xxiv, 632 p. : ill. ; 25 cm. - Wiley series in telecommunications and signal processing . "A Wiley-Interscience publication." Includes bibliographical references and index. ISBN: 0471310212 LCCN: 94048318 Subjects--Topical Terms: Data transmission systems.