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Page 5 of 66
What 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 ...
Read MoreWhat is Twisted Pair Cable?
Twisted pair cable is a type of guided transmission media consisting of two insulated copper conductors twisted together in a helical pattern. The twisting reduces electromagnetic interference and crosstalk between adjacent wire pairs, making it one of the most widely used cables in networking. Each wire in the pair carries the same signal but with opposite polarity. The receiver detects the difference between the two signals, effectively canceling out any external noise that affects both wires equally. The number of twists per inch determines the cable's quality and noise immunity. Twisted Pair Cable Structure ...
Read MoreWhat is Co-axial Cable?
A coaxial cable is a type of electrical cable consisting of a central copper conductor surrounded by insulating material, which is then enclosed by a conductive shield and an outer insulating jacket. This design provides excellent signal transmission capabilities with minimal interference. Coaxial Cable Structure Outer PVC Jacket Copper Mesh Shield PVC Insulation ...
Read MoreWhat is Fibre Optic Cable?
A fibre optic cable is a high-speed data transmission medium made of glass or plastic that transmits information using light signals. Unlike traditional copper cables that use electrical signals, fibre optic cables use light pulses to carry data at incredible speeds over long distances with minimal signal loss. Structure of Fibre Optic Cable Core (Glass) Cladding Protective Jacket Light Ray Path Light travels through the core, reflected by the cladding layer ...
Read MoreDifference between Twisted Pair Cable, Co-axial Cable and Optical Fibre Cable
In the field of computer networking, wired communication remains one of the most efficient and reliable methods for data transmission. Three primary types of cables dominate the networking landscape: twisted pair cables, coaxial cables, and optical fiber cables. Each cable type has distinct characteristics that make it suitable for specific applications and environments. What is a Twisted Pair Cable? A twisted pair cable consists of two insulated copper wires twisted together in a helical pattern. This twisting technique is fundamental to reducing electromagnetic interference and crosstalk between adjacent wire pairs. When external noise affects the cable, it impacts ...
Read MoreWhat is Unguided (Wireless) Media?
Unguided (Wireless) Media refers to transmission media where electromagnetic signals propagate through the air or free space without requiring a physical conductor. These signals travel as electromagnetic waves and are commonly used in wireless communication systems like radio, television, cellular networks, and satellite communications. Unlike guided media (cables), unguided media allows signals to radiate in all directions from the transmitting antenna, enabling communication over large distances and with mobile devices. Electromagnetic Spectrum for Wireless Communication Radio 3 KHz - 300 GHz Microwave ...
Read MoreWhat is Radiowave Transmission?
Radio waves are electromagnetic waves with frequencies between 10 kHz and 1 GHz, occupying the portion of the electromagnetic spectrum known as radiofrequency (RF). These waves form the foundation of wireless communication systems worldwide. Radio waves are omnidirectional, meaning they propagate in all directions from the transmitting antenna. This characteristic eliminates the need for precise alignment between sending and receiving antennas, making radio communication flexible and practical for mobile applications. Radio Wave Transmission Antenna ...
Read MoreWhat is Microwaves Transmission?
The electromagnetic waves having frequencies between 1 and 300 GHz are known as microwaves. Microwave systems use very high-frequency radio signals to transmit data through space wirelessly. The transmitter and receiver of a microwave system must be mounted on very high towers with a clear line-of-sight between them, as microwave signals cannot bend around obstacles. Microwave Transmission System Transmitter Tower Receiver Tower Microwave Signal (1-300 GHz) ...
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