Data Communication 9th and 10th Class Notes Quiz

Data Communication Basics

• Data communication refers to the process of transmitting digital information from one location to another through a communication channel.
• Data transmission is the process of sending data from one location to another, and it can be done through various channels, such as wired or wireless networks, telephone lines, or satellites.

Definition of Data

• Data is the information or facts that are transmitted or stored in a computer system, and it can be in the form of text, numbers, images, audio, or video.

Analog and Digital Signals

• Analog signals are continuous signals that vary in amplitude, frequency, or phase, and are used to transmit data in analog form, such as audio or video signals.
• Digital signals, on the other hand, are discrete signals that represent data as a series of binary digits (0s and 1s), and are used to transmit data in digital form, such as text or images.

Components of a Data Communication System

• A data communication system consists of five basic components:
  • Source: The device or system that generates the data to be transmitted, such as a computer or a phone.
  • Transmitter: The device that converts the data into a signal and transmits it over the communication channel.
  • Communication Channel: The medium through which the signal is transmitted, such as a wire, fiber optic cable, or wireless network.
  • Receiver: The device that receives the signal and converts it back into the original data.
  • Destination: The device or system that receives the data, such as a computer or a phone.