000			00632cam a2200205 a 4500
005			20250331084912.0
008			940801s1994 inua b 001 0 eng
020			_a0672305011 (pbk.) :
050	0	0	_aTK5105 _b.H429 1994
100	1		_aHeld, Gilbert,
245	0	0	_aUnderstanding data communications.
250			_a4th ed. / rev. by Gilbert Held.
260			_aIndianapolis, Ind. : _bSams Pub., _cc1994.
300			_axvii, 435 p. : _bill. ;
500			_aPrevious eds. written by George E. Friend ... et al.
650		0	_aData transmission systems.
650		0	_aComputer networks.
700	1		_aFriend, George E.
942			_cBK
999			_c5693 _d5693