Data Communication Terminology, Lecture notes of Data Communication Systems and Computer Networks

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Data

Communication

Lecture 7 – Day 12

Agenda

• (^) What is Data Communication?
• (^) Communication Process
• (^) Communication Types/Mode

Communication and IT

Information Technology (IT) further enhanced not only the capabilities of the communication system but also began an era of electronic communication. The blend of telecommunication and IT technologies provided more diversified and robust communication system that can transmit any form of information.

Data Communication

Data communication refers to the electronic transmission data over communication channels. Communication is simple concept that involves transmitter or sender, a medium of transmission and the receiver where, the sender transmits the data electronically over a predefined medium to the receiver.

Communication Process

Sourc e Sourc e Transmit ter Transmit ter Receiv er Receiv er Destinat ion Destinat ion Transmi ssion System Transmi ssion System Message

Communication Process

MESSAGE Content transmitted from Source to Destination. SOURCE The originator of the message. TRANSMITTER Converts incoming digital signals from source into terms of transmission media. TRANS. SYSTEM Communication system that provides backbone for data communication. RECEIVER Converts incoming signals from Transmission System back to digital format. DESTINATION Receiver of the message transmitted by Source.

Transmission Modes

Simplex Mode

In simplex mode data flows in only one direction on the data communication line (medium). Examples are radio and television broadcasts. They go from the TV station to home television.

Full Duplex Mode

Full-duplex data transmission means that data can be transmitted in both directions on a signal carrier at the same time. For example, on a local area network, workstations can be send and receive data on the same line at the same time. It essentially operates on a bidirectional mode.