TY  - BOOK
AU  - Shay, William A.
TI  - Understanding Data Communications and Networks
SN  - 0 534 38317 3
U1  - 004.6 SHA 
PY  - 2004///
CY  -  Victoria
PB  - Thomson .
KW  - Data Communications
N1  - Includes bibliographical references and index
ER  -