000 00277nam a2200109Ia 4500
020 _a0876927134
100 _aThiagarajan Viswanathan
245 _aTelecommunication Switching Systems and Networks
260 _c1992
_bPRENTICE HALL
_aNew Delhi
300 _axx+583
942 _cBK
999 _c20762
_d20762