000 00288nam a22001217a 4500
082 _a621.382
100 _aVISWANATHAN THIAGARAGAN
245 _aTELECOMMUNICATION SWITCHING SYSTEMS AND NETWORKS
250 _a2 ND
260 _aNEW DELHI
_bPHI
_c2015
300 _aXX, 620 P
942 _cBK
999 _c7903
_d7903