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In telecommunications, broadband is the wide-bandwidth data transmission that exploits signals at a wide spread of frequencies or several different simultaneous frequencies, and is used in fast internet connections. The medium can be coaxial cable, optical fiber, wireless Internet (radio), twisted pair, or satellite.
Originally used to mean ‘using a wide-spread frequency’ and for services that were analog at the lowest level, nowadays in the context of Internet access, ‘broadband’ is often used to mean any high-speed Internet access that is seemingly always ‘on’ and is faster than dial-up access over traditional analog or ISDN PSTN services.[1]
The ideal telecommunication network has the following characteristics: broadband, multi-media, multi-point, multi-rate and economical implementation for a diversity of services (multi-services).[2][3] The Broadband Integrated Services Digital Network (B-ISDN) was planned to provide these characteristics. Asynchronous Transfer Mode (ATM) was promoted as a target technology for meeting these requirements.[3]
Overview
Different criteria for "broad" have been applied in different contexts and at different times. Its origin is in physics, acoustics, and radio systems engineering, where it had been used with a meaning similar to "wideband",[4][5] or in the context of audio noise reduction systems, where it indicated a single-band rather than a multiple-audio-band system design of the compander. Later, with the advent of digital telecommunications, the term was mainly used for transmission over multiple channels. Whereas a passband signal is also modulated so that it occupies higher frequencies (compared to a baseband signal which is bound to the lowest end of the spectrum, see line coding), it is still occupying a single channel. The key difference is that what is typically considered a broadband signal in this sense is a signal that occupies multiple (non-masking, orthogonal) passbands, thus allowing for much higher throughput over a single medium but with additional complexity in the transmitter/receiver circuitry.
The term became popularized through the 1990s as a marketing term for Internet access that was faster than dial-up access (dial-up being typically limited to a maximum of 56 kbit/s). This meaning is only distantly related to its original technical meaning.
Since 1999, broadband Internet access has been a factor in public policy. In that year, at the World Trade Organization Biannual Conference called “Financial Solutions to Digital Divide” in Seattle, the term “Meaningful Broadband” was introduced to the world leaders, leading to the activation of a movement to close the digital divide. Fundamental aspects of this movement are to suggest that the equitable distribution of broadband is a fundamental human right.[6]
Personal computing facilitated easy access, manipulation, storage, and exchange of information, and required reliable data transmission. Communicating documents by images and the use of high-resolution graphics terminals provided a more natural and informative mode of human interaction than do voice and data alone. Video teleconferencing enhances group interaction at a distance. High-definition entertainment video improves the quality of pictures, but requires much higher transmission rates.
These new data transmission requirements may require new transmission means other than the present overcrowded radio spectrum.[7][8] A modern telecommunications network (such as the broadband network) must provide all these different services (multi-services) to the user.
Differences from old telephony
Conventional telephony communication used:
the voice medium only,
connected only two telephones per telephone call, and
used circuits of fixed bit-rates.
Modern services can be:
Multimedia,
multi-point, and
multi-rate.
These aspects are examined individually in the following three sub-sections.[9]
Multi-media
A multi-media call may communicate audio, data, still images, or full-motion video, or any combination of these media. Each medium has different demands for communication quality, such as:
bandwidth requirement,
signal latency within the network, and
signal fidelity upon delivery by the network.
The information content of each medium may affect the information generated by other media. For example, voice could be transcribed into data via voice recognition, and data commands may control the way voice and video are presented. These interactions most often occur at the communication terminals, but may also occur within the network.[3][7]
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