000			00518 a2200193 4500
003			Libseu
008			211116b |||||||| |||| 00| 0 eng d
020			_a8129702118
041			_aEnglish
082			_a004.6 _bHEL
100			_aHeld, Gilbert
245			_aUnderstanding data communications / _cGilbert Held.
250			_a7th ed.
260			_c2002. _aNew Delhi : _bPearson Education, _g2002
300			_axv, 765 p.
650			_aData transmission systems
650			_aComputer networks
942			_cLEB _2ddc _01
999			_c42485 _d42485