TY  - BOOK
AU  - Spragins, John, D Hammond, Joseph, L 
TI  - Telecomminicatios : protocols and design 
SN  - 0-201-09290-5 
U1  - 621.382 SPR  
PY  - 1992///
CY  - Addision wesley 
PB  - New York 
KW  - COMMUNICATION SYSTEM
ER  -