00279nam a2200109Ia 4500008004100000041001200041082001100053100002000064245007300084260000600157650000600163221030s9999    xx            000 0 und d  aEnglish  a105.23  aT.  Viswanathan 0aTelecommunication Switching Systems and Networkscby T.  Viswanathan  c0  aB