TY  - GEN
AU  - Held, Gilbert,
TI  - Understanding data communications
SN  - 0672322161 (alk. paper)
AV  - TK5105 H429 2002
PY  - 2002///
CY  - Boston
PB  - Addison-Wesley
KW  - Data transmission systems
KW  - Computer networks
N1  - Includes bibliographical references and index
ER  -