TY  - BOOK
AU  - Viswanathan, Thiagarajan 
TI  - Telecommunication switching systems and networks 
SN  - 81-203-0713-5 
U1  - 621.385 7 VIS  
PY  - 2001///
CY  - Prentice hall of india 
PB  - New Dehli 
KW  - TELECOMMUNICATION
ER  -