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Computer Network Articles
Page 20 of 122
Removable Media in Computer Network
The primary purpose of computer networks is to transfer data from a source machine to a destination machine. One of the elementary ways to transfer data between machines is to use removable storage media. This method, often called "sneakernet, " involves physical transportation of storage devices between computers. How It Works The data transfer process using removable media follows these steps: Copy data from the source computer to the removable storage device Physically transport the removable device to the destination computer Copy data from the removable device to the destination computer ...
Read MoreFiber Optic Communications
In fiber optic communication, data is transmitted from the source to the destination by sending light pulses through optical fibers. It changes electrical pulses to light signals and vice versa for communication. Fiber optic communications are preferred when a huge amount of data needs to be transmitted across large distances. Fiber Optic Communication Process Electrical Input Transmitter (LED/Laser) E→L Convert ...
Read MoreFiber Cables
Optical fiber cables are transparent, flexible fibers made of glass or plastic that transmit data using light waves. These cables form the backbone of modern high-speed internet, telecommunications, and data center networks due to their superior bandwidth and transmission capabilities. Fiber Optic Cable Bundle Individual fibers Protective Sheath Multiple glass/plastic fibers bundled in protective coating Structure ...
Read MoreComparison of Fiber Optics and Copper Wire
Fiber optic cables are finding increasing usage due to a number of advantages over the traditional copper wires. However, there are a few drawbacks in their usage too that need to be considered when choosing the appropriate transmission medium. Fiber Optic vs Copper Wire Transmission Fiber Optic Cable Light signals Glass core High speed Copper Wire ...
Read MoreGeosynchronous and Geostationary Satellites
A geosynchronous satellite is a communication satellite that has an orbital period equal to the Earth's rotation period. This means it appears to be permanently in the same area of the sky at a particular time each day when viewed by an observer on Earth. The orbit in which a geosynchronous satellite is placed is called a geosynchronous orbit (GSO). Its orbital period is the sidereal day (23 hours 56 minutes 4 seconds) and its orbital altitude is 35, 800 km above Earth's surface. Geostationary Satellite and Geostationary Orbit (GEO) A geostationary satellite is a special type ...
Read MoreVSAT
VSAT (Very Small Aperture Terminal) is a two-way, low-cost ground microstation for transmitting data to and from communication satellites. A VSAT has a dish antenna with diameters between 75 cm to 1.2 meters, which is very small compared to the 10+ meter diameter antennas used in traditional satellite earth stations. VSATs access satellites in geostationary orbits (GEO) positioned approximately 36, 000 kilometers above the Earth's equator. Data transmission rates in VSAT networks typically range from 4 Kbps to 16 Mbps, making them suitable for various applications from simple data transactions to broadband internet access. ...
Read MoreLow-Earth Orbit Satellites
Low Earth Orbit (LEO) satellites are communication and observation satellites that orbit below 2000 km from the earth's surface, positioned below the lower Van Allen radiation belt. They move at very high speeds and do not maintain a fixed position relative to Earth, requiring multiple satellites to provide continuous coverage. LEO Satellites Orbital Configuration Earth LEO Orbit (~500-2000km) ...
Read MoreFiber Optics vs Satellites
Fiber optic communications and satellite communications are complementary to each other. Their properties are very different from one another and consequently their usage varies. Fiber Optics vs Satellites Satellite Communication ✓ Remote areas ✓ Broadcasting ✓ Mobile communication ...
Read MorePassband Transmission
Passband transmission is a digital modulation technique where the amplitude, phase, or frequency of a high-frequency carrier signal is regulated to transmit digital bits. The incoming data stream is modulated onto a carrier and then transmitted over a band-pass channel that allows only specific frequencies to pass through. Unlike baseband transmission where digital signals are transmitted directly, passband transmission shifts the signal to a higher frequency range, making it suitable for transmission over long distances and through various communication media like radio waves, satellite links, and optical fibers. Types of Passband Modulation ...
Read MoreThe Electromagnetic Spectrum
The electromagnetic spectrum is the entire range of electromagnetic radiation arranged according to wavelength or frequency. It spans frequencies from 1 Hz to 1024 Hz. The waves in order of increasing frequency are radio waves, microwaves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays. Among this range, frequencies between 104 Hz to 1015 Hz are primarily used for communication. The Electromagnetic Spectrum 10⁰ Hz 10⁶ Hz 10¹² Hz 10¹⁵ Hz ...
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