By Robert Techo (auth.)
This publication has advanced basically from lecture notes for info communications classes taught at Georgia kingdom collage considering that 1969. extra fabric was once derived from seminar displays that have been made in this interval in addition to from consulting paintings. instructing information communications within the university of commercial management motivated the viewpoint of this fabric, giving it a semitechnical orientation. This viewpoint has been prolonged to the prepara tion of this publication. purely these technical info have been integrated which, it was once felt, might lead the scholar to a greater figuring out of the topic. References are supplied when you wish extra info specifically components. The reader for whom this ebook is meant is the nontechnical one that has a few wisdom of laptop expertise and who needs to increase that wisdom to the sector of knowledge communications. the 2 key issues under pressure during this publication are terminology and ideas. The goals of this e-book are to allow the coed: 1. To learn articles within the box of knowledge communications with an comprehend ing in their content material. 2. in an effort to interact in a professional discussions with communica tions engineers with reference to info communications. three. To layout and enforce the elements of purposes utilizing information communications. The software program that may be concerned is past the scope of this e-book other than the place protocols are thought of. v vi Preface four. To successfully evaluation proposals for the implementation of knowledge com munications systems.
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Additional info for Data Communications: An Introduction to Concepts and Design
Example text
3. ""'If Open-circuit telegraph system. 4. ~ Use of relays as regenerative repeaters increases the distance of transmission. coiling the wire, this magnetic field is intensified. An iron core, inserted in the coil, concentrates the lines of force of the magnetic field, which then attracts a piece of metal giving a "click" sound. This is the principle of the familiar electromagnet already introduced. a spring, a series of "clicks," representing the elements of a code, can be transmitted by operating the keying instrument.
2). 4 summarizes modem terminology and functions. An acoustic coupler is a portable modem which transmits and receives tones when placed (coupled or cradled) in the ear-and-mouth (E&M) piece of a dial telephone handset. An acoustic coupler is typically a slow-speed device (under 600 bits per second), but its prime advantage is mobility and ready access to almost any dial phone in the country. Because it is mobile, an acoustic coupler may be categorized as a soft-wired device. All other modems are categorized as hard-wired devices, in the sense of being permanently connected to a communications line.
Because of the increased logical capability requirements in the receivers, the FEC method is more expensive than the ARQ method of error control. Currently, the costs of the FEC system can be justified only where the time-value of the messages is high, such as in military, missile, or rocketry applications. However, if the present trends of circuit miniaturization and cost reduction continue, then FEC methods will be economically justifiable for routine data communications applications. There are two major methods of error detection.