Theory of data communication

Data transmission pdf

Accuracy: The system must deliver data accurately. The multiplexing of multiple digital signals is much simpler to the multiplexing of analog signals. In part, this is due to the fact that until now there have been no texts on data communication networking written for undergraduate electrical engineering students. Such information may be used for charging the users of the network based on their usage of the network resources. For data communication to occur, the communicating devices must be part of a communication system made up of a combination of hardware and software. The location of receiver computer is generally different from the sender computer. But as a whole, almost all networking tasks depend on all of these layers. It can consist of text, numbers, pictures, sound or video or any combination of these. This sharing can be local or remote. The rules and regulations are called protocols and standards in Data Communications. A data communication system may collect data from remote locations through data transmission circuits, and then outputs processed results to remote locations.

The medium can be wired like twisted pair wire, coaxial cable, fiber-optic cable or wireless like laser, radio waves, and microwaves.

In the context of computer information system, data represented by binary information units produced and consumed in the form of 0s and 1s. Both sender and receiver follow same protocol s to communicate with each other.

types of data transmission

The multiplexing of multiple digital signals is much simpler to the multiplexing of analog signals. As such, data transmission is also referred to as digital transmission or digital communications.

characteristics of data transmission

They provide numerous advantages: Resource sharing such as printers and storage devices Exchange of information by means of e-Mails and FTP Information sharing by using Web or Internet Interaction with other users using dynamic web pages IP phones.

The effectiveness of a data communication system depends on the three fundamental characteristics: 1.

data transmission modes

The data are represented as an electromagnetic signal, such as an electrical voltage, radiowave, microwave, or infrared signal.

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Data Communication