000 00307nam a2200121Ia 4500
008 220201s2000 xx 000 0 eng d
082 _a621.382
_bVIS
100 _aViswanathan, T
245 0 _aTele communication switching system & networks
260 _bPrentice Hall
_c2000
300 _a583
942 _2ddc
999 _c86966
_d86966