000 00287nam a2200109Ia 4500
008 230718s9999||||xx |||||||||||||| ||und||
082 _a621.38
100 _aVISHWANATHAN
245 0 _aTELECOMMUNICATION SWITCHING SYSTEMS AND NETWORKS
260 _bP H I
_c2001
_aNEW DELHI
300 _a583
999 _c38089
_d38089