000			01415nam a2200229Ia 4500
003			NULRC
005			20250520094903.0
008			250520s9999 xx 000 0 und d
020			_a672305011
040			_cNULRC
050			_aTK 5105 .H45 1994
100			_aHeld, Gilbert _eauthor
245		0	_aUnderstanding data communications / _cGilbert Held
250			_aFourth Edition.
260			_aIndianapolis, Indiana : _bSams Publishing, _cc1994
300			_axvii, 435 pages : _billustrations ; _c24 cm.
504			_aIncludes bibliographical references and index.
505			_a1. An Overview of Data Communications -- 2. Terminal Devices -- 3. Messages and Transmission Channels -- 4. Asynchronous Modems and Interfaces -- 5. Synchronous Modems, Digital Transmission, and Service Units -- 6. Multiplexing Techniques -- 7. Fiber-Optic and Satellite Communications -- 8. Protocols and Error Control -- 9. Personal Computer Communications Software -- 10. Alternatives in Local Area Networks -- 11. Architectures and Packet Networks -- 12. Network Design and Management -- 13. ISDN.
520			_aThis text teaches digital communications, the inner workings of data terminals, modems, fibre optics and satellites. It covers the fundamentals, the functions of data terminals and their components and the latest network architecture and design techniques.
650			_aDATA TRANSMISSION SYSTEMS
942			_2lcc _cBK
999			_c5335 _d5335