TY  - BOOK
AU  - Shay,William A.
TI  - Understanding data communications and networks
SN  - 9780534950545
U1  - 004.6 SHA 
PY  - 1999///
CY  - Pacific Grove, Calif.
PB  - PWS
KW  - Data transmission systems
KW  - Computer networks
N1  - Includes bibliographical references and index
ER  -