000 00272nam a2200109Ia 4500
020 _a97881420307131
082 _a621.3822
100 _aVISWANATHAN, THIAGRAJAN
245 _aTELECOMMUNICATION SWITCHING SYSTEM & NETWORKS
260 _aNEW DELHI
_b NEW AGE
_c2010
942 _cBK
999 _c7348
_d7348