TY  - BOOK
AU  - Held,Gilbert
AU  - Friend,George E.
TI  - Understanding data communications
SN  - 0672309343
AV  - TK5105 .H429 1996
U1  - 004.6 21
PY  - 1996///
CY  - Indianapolis, IN
PB  - Sams Pub.
KW  - Data transmission systems
KW  - Computer networks
N1  - Previous eds. written by George E. Friend ... et al; Includes bibliographical references (p. [477]-478) and index
ER  -