00275nam a2200109Ia 4500008004100000041001200041082001100053100001900064245007000083260000600153650000600159221030s9999    xx            000 0 und d  aEnglish  a105.23  aT. Viswanathan 0aTelecommunication Switching Systems & Networkscby T. Viswanathan  c0  aB