000 00421nam a2200181Ia 4500
008 240220s9999 xx 000 0 und d
041 _aENG
082 _a621.38
100 _aViswanathan T.
245 0 _aTele communication switching systems and network
260 _aNew Delhi
260 _bPHI Learning Private Limited
260 _c2010
300 _a583p.
365 _b275
650 _aETC
942 _cDBK
999 _c30293
_d30293