TY  - GEN
AU  - Nussbaumer, Henri
AU  - Nelson, John C.C. 
TI  - Computer communication systems vol.1 : : data circuits, error detection, data links
SN  - 0471923796
PY  - 1990///
CY  - Chichester
PB  - John Wiley
KW  - COMPUTER NETWORKS
KW  - MODEMS
KW  - COMPUTER PERIPHERAL EQUIPMENT
ER  -