TY  - GEN
AU  - Held,Gilbert
TI  - Understanding data communications
SN  - 8131708721 (alk. paper)
AV  - TK5105 H429 2002
U1  - 004.6 
PY  - 2002///
CY  - New Delhi
PB  - Pearson Education
KW  - Computer networks
KW  - Data transmission systems
N1  - Includes bibliographical references and index
ER  -