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005			20220518105102.0
008			100202t xxu||||| |||| 00| 0 eng d
082			_a621.387
100			_aALI,SYED.A _96482
245			_aDIGITAL SWITCHING SYSTEMS
300			_a217p.
653			_aSWITCHING SYSTEM
942			_cBB
260			_aNEW DELHI _bTATA McGRAW-HILL _c2002
020			_a0070483906
999			_c189797 _d189797