Understanding data communications.

Held, Gilbert,

Understanding data communications. - 4th ed. / rev. by Gilbert Held. - Indianapolis, Ind. : Sams Pub., c1994. - xvii, 435 p. : ill. ;

Previous eds. written by George E. Friend ... et al.

0672305011 (pbk.) :


Data transmission systems.
Computer networks.

TK5105 / .H429 1994