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Operating System Articles
Page 162 of 171
What is WAN (Wide Area Network) in Computer Network?
A Wide Area Network (WAN) is a computer network that connects two or more computers across large geographical distances, spanning cities, countries, or even continents. Unlike LANs, WANs utilize public networks such as telephone systems, microwave broadcasts, or satellite communications for connectivity. WAN Architecture LAN A WAN Infrastructure LAN B LAN C ...
Read MoreExplain the functions of WAN in Computer Network
A Wide Area Network (WAN) serves multiple critical functions that enable organizations to connect geographically dispersed locations and resources. These functions make WANs essential for modern business operations and global communications. Key Functions of WAN Remote Data Entry Centralized Information Global Communication Resource Sharing WAN Core Remote ...
Read MoreWhat is Fully-Interconnected Network Topology?
A Fully-Interconnected Network Topology, also known as a mesh topology, is a network design where every node is connected to every other node through dedicated point-to-point links. This creates a complete network where each device has direct communication paths to all other devices without requiring intermediate nodes. In this topology, each computer has its own control and decision-making power for communication priorities. The network provides high reliability since the failure of any single transmission line only affects communication between those two specific nodes, while all other connections remain operational. Fully-Interconnected Network (5 Nodes) ...
Read MoreWhat is MultiDrop Network Topology in Computer Network?
A MultiDrop Network Topology, also known as a broadcasting network, is a network configuration where multiple nodes share a single communication line or cable. Unlike a fully interconnected network that requires individual cables between all nodes, this topology uses one shared medium for all network communication. MultiDrop Network Topology A B C D Single Shared Communication Line Message ...
Read MoreWhat is Modem in Computer Network?
A modem (Modulation-Demodulation) is a crucial networking device that converts digital data signals into analog signals for transmission over analog communication lines, and vice versa. Modems bridge the gap between digital computers and analog telephone networks, enabling data communication over existing infrastructure. Modems can be installed within a computer in a compatible expansion slot or connected externally through serial ports. They serve as the interface between digital computing devices and analog transmission media. Types of Modems by Installation Internal Modems Internal modems are installed directly into a computer's expansion slot and do not require additional physical ...
Read MoreWhat are Network Connecting Devices?
Network connecting devices are essential hardware components that enable computers and other electronic devices to communicate and share resources like printers, files, and internet connections within a Local Area Network (LAN) or across different networks. These devices form the backbone of modern networking infrastructure, each serving specific functions in data transmission, routing, and protocol conversion. Let us examine the key network connecting devices and their roles. Network Interface Card (NIC) A Network Interface Card (NIC) is a hardware component that connects a computer to a network. The NIC is installed in an expansion slot within each computer ...
Read MoreWhat is Unipolar Encoding?
Unipolar encoding is a digital transmission scheme that uses only one polarity (positive or negative) to represent binary data. In this encoding method, one voltage level represents binary '1' and zero voltage represents binary '0'. The term "unipolar" refers to the use of a single polarity for signal transmission. Typically, a positive voltage pulse represents binary '1', while binary '0' is represented by zero voltage (no pulse). This makes unipolar encoding one of the simplest and most cost-effective digital encoding schemes. Unipolar Encoding Scheme Binary Data: ...
Read MoreWhat is Polar Encoding?
Polar encoding is a digital encoding scheme that uses two voltage levels — one positive and one negative — to represent binary data. Unlike unipolar encoding which uses only one polarity, polar encoding eliminates the DC component by using both positive and negative voltages, resulting in better signal transmission characteristics. In polar encoding, the average voltage is reduced to zero over time because positive and negative voltages cancel each other out. This makes it superior to unipolar schemes for long-distance communication as it reduces power consumption and improves signal integrity. Polar Encoding: Positive and ...
Read MoreWhat is Bipolar Encoding?
The bipolar encoding scheme defines three voltage levels: positive, negative, and zero. In bipolar encoding, zero voltage represents binary 0, while binary 1 is represented by alternating positive and negative voltages. The first 1 bit is represented by positive amplitude, the second 1 bit by negative voltage, the third 1 bit by positive amplitude, and so on. This alternation continues even when the 1 bits are not consecutive, ensuring a balanced signal without DC component. Bipolar Encoding Principle ...
Read MoreWhat is Quadrature Amplitude Modulation (QAM)?
Quadrature Amplitude Modulation (QAM) is a digital modulation technique that combines both Amplitude Shift Keying (ASK) and Phase Shift Keying (PSK) to achieve higher data transmission rates. By varying both the amplitude and phase of a carrier signal, QAM can encode more bits per symbol than traditional modulation schemes. While Phase Shift Keying (PSK) is limited by the equipment's ability to distinguish small phase differences, QAM overcomes this limitation by using both amplitude and phase variations. This combination allows for maximum differentiation between signal units (bits, dibits, tribits), enabling higher spectral efficiency. How QAM Works QAM creates ...
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