TY  - BOOK
AU  - Barden, Robert
AU  - Hacker, Michael. 
TI  - Communication technology
SN  - 0827332254
U1  - FOR 621.382 B23c 1990 
PY  - 1990///
CY  - USA
PB  - Delmar Publishers Inc.
KW  - Telecommunication
N1  - Includes index.; Glossary: pages 424-428
ER  -