Held, Gilbert, 1943-
Understanding data communications.
- 4th ed. / rev. by Gilbert Held.
- Indianapolis, Ind. : Sams Pub., c1994.
- xvii, 435 p. : ill. ; 24 cm.
Previous eds. written by George E. Friend ... et al.
Includes bibliographical references (p. [403]-404) and index.
9713702735
Data transmission systems.
Computer networks.
TK5105 / .H429 1994
004.6