TY  - BOOK
AU  - Halsall, Fred
TI  - Data communications, computer networks and open systems
SN  - 9788178080987
U1  - 004.6 HAL 
PY  - 1996///
CY  - New Delhi
PB  - : pearson education
KW  -  Data transmission systems.
KW  - Computer network protocols.
KW  - Data communications, computer networks and open systems
KW  - computer science
KW  - Fred Halsall
ER  -