Data Transmission Overview

This flashcard set covers key concepts related to data transmission, including modes, signal types, and transmission media.

What is data transmission?

It refers to the movement of data in the form of bits between two or more digital devices.

What are the three types of transmission mode?

1. Simplex Transmission Mode 2. Half Duplex Transmission Mode 3. Full Duplex Transmission Mode.

Define Simplex transmission mode.

Data transmission that is one-way communication where one device only sends or receives data.

What characterizes Half Duplex transmission mode?

Data can be sent both ways, but not simultaneously.

Define Full Duplex transmission mode.

Data can be transmitted both ways at the same time.

What are the two types of signals?

Analog signal and Digital signal.

What is attenuation in data transmission?

Attenuation is the reduction of signal strength during transmission.

What causes distortion in signals?

Distortion occurs when the original signal is altered, often due to changes in the transmission medium.

What is noise in the context of data transmission?

Noise is a random and unpredictable electrical signal that interferes with the transmission of the desired signal.

What are the two types of transmission media?

Guided (wired) and Unguided (wireless) transmission media.

Describe Twisted-Pair Cable.

Twisted-pair cable uses metallic conductors that transport signals in the form of electric current and helps minimize electronic interference.

What is the difference between Shielded twisted pair (STP) and Unshielded twisted pair (UTP)?

STP has a metallic shield to reduce interference, while UTP does not, making it cheaper and easier to install.

What is Fiber Optics?

The science of transmitting data, voice, and images through thin transparent fibers using light.

What is the advantage of Fiber Optic cables over twisted-pair and coaxial cables?

Fiber optic cables have lower attenuation and can carry more data at higher speeds.

What are the applications of infrared communication?

Used for short-range communication in devices like keyboards, mice, PCs, and printers, with data rates defined by the Infrared Data Association (IrDA).

How does the electromagnetic spectrum relate to wireless communication?

It is used to reference the range of frequencies utilized for transmitting signals without physical conductors.

What characterizes Microwave communication?

Microwaves are unidirectional, requiring aligned antennas for transmission, and are useful in cellular and satellite networks.

What are the advantages of Infrared waves in communication?

Infrared waves do not penetrate walls, preventing interference between systems, making them suitable for short-range communication.

What does signal encoding in computer networks involve?

The process of converting data into a specific format using voltage or current levels to represent binary data.