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Multicast

multicastinggroup addressingmulticast channel
Data transmission (also data communication or digital communications) is the transfer of data (a digital bitstream or a digitized analog signal ) over a point-to-point or point-to-multipoint communication channel.
In computer networking, multicast is group communication where data transmission is addressed to a group of destination computers simultaneously.

Signal

signalselectrical signalelectrical signals
The data are represented as an electromagnetic signal, such as an electrical voltage, radiowave, microwave, or infrared signal.
Engineering disciplines such as electrical engineering have led the way in the design, study, and implementation of systems involving transmission, storage, and manipulation of information.

Data compression

compressionvideo compressioncompressed
It may also be an analog signal such as a phone call or a video signal, digitized into a bit-stream, for example, using pulse-code modulation (PCM) or more advanced source coding (analog-to-digital conversion and data compression) schemes.
In the context of data transmission, it is called source coding; encoding done at the source of the data before it is stored or transmitted.

Coding theory

algebraic coding theorycodingchannel code
The theoretical aspects of data transmission are covered by information theory and coding theory.
Codes are used for data compression, cryptography, error detection and correction, data transmission and data storage.

Digital data

digitaldigital informationdigitally
Data transmission (also data communication or digital communications) is the transfer of data (a digital bitstream or a digitized analog signal ) over a point-to-point or point-to-multipoint communication channel.
Copying: Because of the inevitable presence of noise, making many successive copies of an analog communication is infeasible because each generation increases the noise. Because digital communications are generally error-free, copies of copies can be made indefinitely.

Modulation

modulatedmodulatordigital modulation
The messages are either represented by a sequence of pulses by means of a line code (baseband transmission), or by a limited set of continuously varying wave forms (passband transmission), using a digital modulation method. In most textbooks, the term analog transmission only refers to the transmission of an analog message signal (without digitization) by means of an analog signal, either as a non-modulated baseband signal, or as a passband signal using an analog modulation method such as AM or FM.
The aim of pulse modulation methods is to transfer a narrowband analog signal, for example, a phone call over a wideband baseband channel or, in some of the schemes, as a bit stream over another digital transmission system.

Passband

pass bandpass-bandpassband signal
The messages are either represented by a sequence of pulses by means of a line code (baseband transmission), or by a limited set of continuously varying wave forms (passband transmission), using a digital modulation method.
There are two main categories of digital communication transmission methods: baseband and passband.

Digital signal

digitaldigital signalsbinary signal
According to the most common definition of digital signal, both baseband and passband signals representing bit-streams are considered as digital transmission, while an alternative definition only considers the baseband signal as digital, and passband transmission of digital data as a form of digital-to-analog conversion.
Digital signals are used in all digital electronics, notably computing equipment and data transmission.

Flow control (data)

flow controlhardware flow controlCTS
Flow control
In data communications, flow control is the process of managing the rate of data transmission between two nodes to prevent a fast sender from overwhelming a slow receiver.

Automatic repeat request

ARQautomatic repeat-requestKISS
Error detection and automatic repeat request (ARQ)
Automatic repeat request (ARQ), also known as automatic repeat query, is an error-control method for data transmission that uses acknowledgements (messages sent by the receiver indicating that it has correctly received a packet) and timeouts (specified periods of time allowed to elapse before an acknowledgment is to be received) to achieve reliable data transmission over an unreliable service.

Telecommunication

telecommunicationscommunicationstelecom
Digital transmission or data transmission traditionally belongs to telecommunications and electrical engineering.
There are analog communication systems and digital communication systems.

Forward error correction

FECchannel codingerror correcting codes
Channel coding including
In telecommunication, information theory, and coding theory, forward error correction (FEC) or channel coding is a technique used for controlling errors in data transmission over unreliable or noisy communication channels.

Analog transmission

analoganalogueanalog radio
In most textbooks, the term analog transmission only refers to the transmission of an analog message signal (without digitization) by means of an analog signal, either as a non-modulated baseband signal, or as a passband signal using an analog modulation method such as AM or FM.
Others define that as digital transmission and as a digital signal.

Computer network

networknetworkingcomputer networking
Basic principles of data transmission may also be covered within the computer science or computer engineering topic of data communications, which also includes computer networking applications and networking protocols, for example routing, switching and inter-process communication. Data transmission is utilized in computer networking equipment such as modems (1940), local area networks (LAN) adapters (1964), repeaters, repeater hubs, microwave links, wireless network access points (1997), etc.
In computer networks, computing devices exchange data with each other using connections (data links) between nodes.

Computer science

computer scientistcomputer sciencescomputer scientists
Basic principles of data transmission may also be covered within the computer science or computer engineering topic of data communications, which also includes computer networking applications and networking protocols, for example routing, switching and inter-process communication.
Codes are studied for the purpose of designing efficient and reliable data transmission methods.

Microwave transmission

microwave radio relaymicrowave relaymicrowave link
Data transmission is utilized in computer networking equipment such as modems (1940), local area networks (LAN) adapters (1964), repeaters, repeater hubs, microwave links, wireless network access points (1997), etc.
Microwave transmission is the transmission of information by microwave radio waves.

Self-synchronizing code

bit synchronizationSelf-synchronizationself-synchronizing
Bit synchronization
Importance of self-synchronizing codes is not limited to data transmission.

Equalization (communications)

equalizationequalizerequalizers
Equalization
In digital communications, the equalizer's purpose is to reduce intersymbol interference to allow recovery of the transmit symbols.

Digital radio

digitalDABdigital transmission
Examples are second-generation (1991) and later cellular telephony, video conferencing, digital TV (1998), digital radio (1999), telemetry, etc.
Digital transmission by radio waves includes digital broadcasting, and especially digital audio radio services.

Serial communication

serialserial interfaceserial communications
In telecommunications, serial transmission is the sequential transmission of signal elements of a group representing a character or other entity of data.
In telecommunication and data transmission, serial communication is the process of sending data one bit at a time, sequentially, over a communication channel or computer bus.

Information

informativeinputinputs
Data (mainly but not exclusively informational) has been sent via non-electronic (e.g. optical, acoustic, mechanical) means since the advent of communication.
These fields deal with those processes and techniques pertaining to information capture (through sensors) and generation (through computation, formulation or composition), processing (including encoding, encryption, compression, packaging), transmission (including all telecommunication methods), presentation (including visualization / display methods), storage (such as magnetic or optical, including holographic methods), etc. Information does not cease to exist, it may only get scrambled beyond any possibility of retrieval (within information theory, see lossy compression; in physics, the black hole information paradox gets solved with the aid of the holographic principle).

Parallel communication

parallelparallel busparallel communications
In telecommunications, parallel transmission is the simultaneous transmission of the signal elements of a character or other entity of data.
In data transmission, parallel communication is a method of conveying multiple binary digits (bits) simultaneously.

Data migration

migrationmigration testingdata relocation
Data migration
Data migration is the process of selecting, preparing, extracting, and transforming data and permanently transferring it from one computer storage system to another.

Physical layer

physicalPHYlayer 1
Layer 1, the physical layer:
Data transmission

Communication

communicationscommunicatecommunication skills
Data (mainly but not exclusively informational) has been sent via non-electronic (e.g. optical, acoustic, mechanical) means since the advent of communication.
Communication can be seen as processes of information transmission with three levels of semiotic rules: