00325nam a2200133Ia 4500008004100000020001500041041001200056082001600068100001400084245004400098260002500142300000800167650001600175221030s9999    xx            000 0 und d  a0070483906  aEnglish  a105.23bAli  aS. R. Ali 0aDigital Switching Systemscby S. R. Ali  bTMHaNew Delhic2002  a217  aBE Computer