000 00287nam a2200121Ia 4500
008 211209s2008 xx 000 0 und d
020 _a0070483903
041 _aeng
100 _aALI SYED R
245 _aDIGITAL SWITCHING SYSTEMS
260 _aNEW DELHI
_bTMH
_c2008
300 _aXV + 219
999 _c59820
_d59820