000 00296nam a22001217a 4500
020 _a9788120350830
082 _a621.382
100 _aTHIGARAJAN VISWANATHAN
245 _aTELECOMMUNICATION SWITCHING SYSTEMS AND NETWORKS
260 _aNEW DELHI
_bPHI
_c2015
300 _aXX, 620 P
942 _cBK
999 _c8383
_d8383