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010			_a88060044
020			_a0672272709 (pbk.) :
020			_a8120310802
082	0	0	_a621.382 _bF9117
090			_c746 _d746
100			_a20080729
245	0	0	_aUnderstanding data communications / _cwritten by George E. Friend ... [et al.] ; with contributions by Gerald Luecke, managing editor, Charles W. Battle, editor.
250			_a4th ed. / _brevised by Gilbert Held.
260			_aNew Delhi : _bPrentice Hall of India, _cc1996.
300			_a435 p. : _bill. ; _c23 cm.
500			_aIncludes index.
504			_aBibliography: p. 283.
650		0	_aData transmission systems.
700	1		_aFriend, George E.
700	1		_aLuecke, Gerald.
700	1		_aBattle, Charles W.
700	1		_aHeld, Gilbert, _d1943-
942			_cBB _k621.382F9117
999			_c746 _d746