TY  - BOOK
AU  - Shay, William A.
TI  - Understanding Data Communications and Networks 
SN  - 053495054X
U1  - 004.6 
PY  - 1999///
CY  - Pacific Grove, CA : 
PB  - PWS Publshing, 
KW  - Computer Networks
KW  - Data Transmission Systems
N1  - YY
UR  - https://eaklibrary.neduet.edu.pk:8443/catalog/bk/books/toc/0-534-95054-X.pdf
ER  -