00293nam a2200109Ia 4500008004100000041001200041082001100053100002800064245007900092260000600171650000600177221030s9999    xx            000 0 und d  aEnglish  a105.23  aThiagarajan Viswanathan 0aTelecommunication Switching Systems & Networkscby Thiagarajan Viswanathan  c0  aB