Shay, William A. Understanding data communications and networks [[Book] /] William A. Shay. - 3rd.ed. - Australia ; Belmont, Calif. : Thomson Brooks/Cole, 2004. - 766 p. : ill. ; 25 cm. Includes bibliographical references and index. All age. ISBN: 7111137868 Subjects--Topical Terms: Data transmission systems.Computer networks. Dewey Class. No.: 004.6