The term broadband refers to a telecommunications signal of greater bandwidth Bandwidth is typically measured in hertz, and may sometimes refer to passband bandwidth, sometimes to baseband bandwidth, depending on context. Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, an electronic filter, a communication channel, or a signal spectrum. In case of a lowpass filter or, in some sense, than another standard or usual signal (and the broader the band, the greater the capacity for traffic). Different criteria for "broad" have been applied in different contexts and at different times. Its origin is in radio systems engineering, but became popularized after MediaOne US West founded MediaOne , through the combination of GCTV serving Atlanta, Georgia and Dekalb County, Georgia and Wometco Cable's assets in the suburbs of Georgia adopted it as part of a marketing campaign in 1996 to sell their high speed data access. The slogan was "This is Broadband. This is the Way". Until today, the term has never been formally defined, even though it is used widely and has been the subject of many policy debates, and the FCC "National Broadband Plan".
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In telecommunication
Broadband in telecommunications Telecommunication is the transmission of messages, over significant distances, for the purpose of communication. In earlier times, telecommunications involved the use of visual signals, such as smoke, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded drumbeats, lung-blown horns, or sent by loud whistles, for refers to a signaling method that includes or handles a relatively wide range (or band) of frequencies Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency. The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency. Loosely speaking, 1 year is the period of the Earth's orbit around the Sun, and the Earth's rotation on its axis has, which may be divided into channels or frequency bins. Broadband is always a relative term A relative term, also called a rhema or a rheme, is a logical term that requires reference to any number of other objects, called the correlates of the term, in order to denote a definite object, called the relate of the relative term in question. A relative term is typically expressed in ordinary language by means of a phrase with explicit or, understood according to its context. The wider (or broader) the bandwidth Bandwidth is typically measured in hertz, and may sometimes refer to passband bandwidth, sometimes to baseband bandwidth, depending on context. Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, an electronic filter, a communication channel, or a signal spectrum. In case of a lowpass filter or of a channel, the greater the information-carrying capacity. In radio Radio is the transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. Information is carried by systematically changing some property of the radiated waves, such as, for example, a very narrow-band signal will carry Morse code Morse code is a method of transmitting textual information as a series of on-off tones, lights, or clicks that can be directly understood by a skilled listener or observer without special equipment. The International Morse Code encodes the Roman alphabet, the Arabic numerals and a small set of punctuation and procedural signals as standardized; a broader band will carry speech; a still broader band is required to carry music Music is an art form whose medium is sound. Common elements of music are pitch , rhythm (and its associated concepts tempo, meter, and articulation), dynamics, and the sonic qualities of timbre and texture. The word derives from Greek μουσική (mousike), "(art) of the Muses." without losing the high audio frequencies An audio frequency , or audible frequency is characterized as a periodic vibration whose frequency is audible to the average human. While the range of frequencies that any individual can hear is largely related to environmental factors, the generally accepted standard range of audible frequencies is 20 to 20,000 hertz. Frequencies below 20 Hz can required for realistic sound reproduction Sound recording and reproduction is an electrical or mechanical inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects. The two main classes of sound recording technology are analog recording and digital recording. Acoustic analog recording is achieved by a small microphone diaphragm that. A television Television is a widely used telecommunication medium for transmitting and receiving moving images, either monochromatic ("black and white") or color, usually accompanied by sound. "Television" may also refer specifically to a television set, television programming or television transmission. The word is derived from mixed Latin antenna described as "broadband" may be capable of receiving a wide range of channels; while a single-frequency or Lo-VHF antenna is "narrowband" since it only receives 1 to 5 channels. In data communications a digital 56k modems are voiceband modems nominally capable of download speeds up to 56 kbit/s . At the beginning of the 21st Century, most personal computers contained one[citation needed], but their use is declining as broadband technologies such as DSL and UMTS/HSDPA gain wider availability modem A modem is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. The goal is to produce a signal that can be transmitted easily and decoded to reproduce the original digital data. Modems can be used over any means of transmitting analog will transmit a datarate of 56 kilobits per seconds (kbit/s) over a 4 kilohertz wide telephone line A telephone line or telephone circuit is a single-user circuit on a telephone communications system. Typically this refers to the physical wire or other signaling medium connecting the user's telephone apparatus to the telecommunications network, and usually also implies a single telephone number for billing purposes reserved for that user (narrowband or voiceband In electronics, voiceband means the typical human hearing frequency range that is from 20 Hz to 20 kHz. In telephony, it means the frequency range normally transmitted by a telephone line, generally about 200–3600 Hz. Frequency-division multiplexing in telephony normally uses 4 kHz carrier spacing. The roll-off rate, or rate at which the). However when that same line is converted to an non-loaded twisted-pair wire (no telephone filters), it becomes hundreds of kilohertz wide (broadband) and can carry several megabits per second (ADSL Asymmetric Digital Subscriber Line is one form of the Digital Subscriber Line technology, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voiceband modem can provide. It does this by utilizing frequencies that are not used by a voice telephone call. A splitter, or DSL filter,).
In data communications
Broadband in data The term data refers to groups of information that represent the qualitative or quantitative attributes of a variable or set of variables. Data are typically the results of measurements and can be the basis of graphs, images, or observations of a set of variables. Data are often viewed as the lowest level of abstraction from which information and can refer to broadband networks Society is becoming more informationally and visually oriented. Personal computing facilitates easy access, manipulation, storage, and exchange of information, and these processes require reliable data transmission. The means or media for communicating data are becoming more diverse. Communicating documents by images and the use of high-resolution or broadband Internet Broadband Internet access, often shortened to just broadband, is a high data rate Internet access—typically contrasted with dial-up access using a 56k modem and may have the same meaning as above, so that data transmission Data transmission, digital transmission or digital communications is the physical transfer of data over a point-to-point or point-to-multipoint transmission medium. Examples of such media are copper wires, optical fibres, wireless communication media, and storage media. The data is often represented as an electro-magnetic signal, such as an over a fiber optic Fiber optics is the field of applied science and engineering concerned with the design and application of optical fibers. An optical fiber is a thin, flexible, transparent fiber that acts as a waveguide, or "light pipe", to transmit light between the two ends of the fiber. Optical fibers are widely used in fiber-optic communications, cable would be referred to as broadband as compared to a telephone modem A modem is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. The goal is to produce a signal that can be transmitted easily and decoded to reproduce the original digital data. Modems can be used over any means of transmitting analog operating at 56,000 56k modems are voiceband modems nominally capable of download speeds up to 56 kbit/s . At the beginning of the 21st Century, most personal computers contained one[citation needed], but their use is declining as broadband technologies such as DSL and UMTS/HSDPA gain wider availability bits per second In telecommunications and computing, bitrate is the number of bits that are conveyed or processed per unit of time. However, a worldwide standard for what level of bandwidth and network speeds actually constitute Broadband have not been determined.[1]
However, broadband in data communications Computer networking is the engineering discipline concerned with the communication between computer systems or devices. A computer network is any set of computers or devices connected to each other with the ability to exchange data. Computer networking is sometimes considered a sub-discipline of telecommunications, computer science, information is frequently used in a more technical sense to refer to data transmission where multiple pieces of data are sent simultaneously to increase the effective rate of transmission, regardless of data signaling rate In telecommunication, data signaling rate , also known as gross bit rate, is the aggregate rate at which data pass a point in the transmission path of a data transmission system. In network engineering Categories: Electronic engineering | Computer engineering | Communication engineering this term is used for methods where two or more signals share a medium.[2] Broadband Internet access, often shortened to just broadband, is a high data rate Internet access—typically contrasted with dial-up access using a 56k modem.
Dial-up modems are limited to a bitrate of less than 56 kbit/s (kilobits per second) and require the full use of a telephone line—whereas broadband technologies supply more than double this rate and generally without disrupting telephone use.
In DSL
The various forms of digital subscriber line Digital Subscriber Line is a family of technologies that provides digital data transmission over the wires of a local telephone network. DSL originally stood for digital subscriber loop. In telecommunications marketing, the term Digital Subscriber Line is widely understood to mean Asymmetric Digital Subscriber Line (ADSL), the most commonly (DSL) services are broadband in the sense that digital information is sent over a high-bandwidth channel. This channel is located above (i.e., at higher frequency than) the baseband In telecommunications and signal processing, baseband is an adjective that describes signals and systems whose range of frequencies is measured from close to 0 hertz to a cut-off frequency, a maximum bandwidth or highest signal frequency; it is sometimes used as a noun for a band of frequencies starting close to zero. Baseband can often be voice channel on a single pair of wires.[2]
In Ethernet
A baseband In telecommunications and signal processing, baseband is an adjective that describes signals and systems whose range of frequencies is measured from close to 0 hertz to a cut-off frequency, a maximum bandwidth or highest signal frequency; it is sometimes used as a noun for a band of frequencies starting close to zero. Baseband can often be transmission sends one type of signal using a medium's full bandwidth, as in 100BASE-T In computer networking, Fast Ethernet is a collective term for a number of Ethernet standards that carry traffic at the nominal rate of 100 Mbit/s, against the original Ethernet speed of 10 Mbit/s. Of the fast Ethernet standards 100BASE-TX is by far the most common and is supported by the vast majority of Ethernet hardware currently produced. Fast Ethernet Ethernet is a family of frame-based computer networking technologies for local area networks . The name came from the physical concept of the ether. It defines a number of wiring and signaling standards for the Physical Layer of the OSI networking model as well as a common addressing format and Media Access Control at the Data Link Layer. Ethernet, however, is the common interface to broadband modems such as DSL data links, and has a high data rate itself, so is sometimes referred to as broadband. Ethernet provided over cable modem A cable modem is a type of network bridge and modem that provides bi-directional data communication via radio frequency channels on a HFC and RFoG infrastructure. Cable modems are primarily used to deliver broadband Internet access in the form of cable Internet, taking advantage of the high bandwidth of a HFC and RFoG network. They are commonly is a common alternative to DSL.
In power-line communication
Power lines Power line communication or power line carrier , also known as Power line Digital Subscriber Line (PDSL), mains communication, power line telecom (PLT), or power line networking (PLN), or Broadband over Power Lines (BPL) are systems for carrying data on a conductor also used for electric power transmission have also been used for various types of data communication. Although some systems for remote control are based on narrowband Two-Way Radio Narrowbanding refers to an FCC Order issued in December of 2004 requiring all CFR 47 Part 90 VHF and UHF (421-512 MHz) PLMR (Private Land Mobile Radio) licensees operating legacy wideband (25 KHz bandwidth) voice or data/SCADA systems to migrate to narrowband (12.5 KHz bandwidth or equivalent) systems by January 1, 2013. Further signaling, modern high-speed systems use broadband signaling to achieve very high data rates. One example is the ITU-T The Telecommunication Standardization Sector coordinates standards for telecommunications on behalf of the International Telecommunication Union (ITU) and is based in Geneva, Switzerland G.hn G.hn is the common name for a home network technology standard being developed under the International Telecommunication Union and promoted by the HomeGrid Forum and several other organizations. and several other organizations. It supports networking over power lines, phone lines and coaxial cables with data rates up to 1 Gbit/s standard, which provides a way to create a high-speed (up to 1 Gigabit/s) Local area network A local area network is a computer network covering a small physical area, like a home, office, or small groups of buildings, such as a school, or an airport. The defining characteristics of LANs, in contrast to wide area networks (WANs), include their usually higher data-transfer rates, smaller geographic area, and lack of a need for leased using existing home wiring (including power lines, but also phone lines and coaxial cables Ethernet over Coax is a family of technologies that supports the transmission of Ethernet frames over coaxial or coax cable).
In video
Broadband in analog An Analog or analogue signal is any continuous signal for which the time varying feature of the signal is a representation of some other time varying quantity, i.e., analogous to another time varying signal. It differs from a digital signal in terms of small fluctuations in the signal which are meaningful. Analog is usually thought of in an video Video is the technology of electronically capturing, recording, processing, storing, transmitting, and reconstructing a sequence of still images representing scenes in motion distribution is traditionally used to refer to systems such as cable television Cable television is a system of providing television to consumers via radio frequency signals transmitted to televisions through fixed optical fibers or coaxial cables as opposed to the over-the-air method used in traditional television broadcasting in which a television antenna is required. FM radio programming, high-speed Internet, telephony,, where the individual channels are modulated In electronics, modulation is the process of varying one or more properties of a high frequency periodic waveform, called the carrier signal, with respect to a modulating signal. This is done in a similar fashion as a musician may modulate a tone from a musical instrument by varying its volume, timing and pitch. The three key parameters of a on carriers at fixed frequencies.[3] In this context, baseband In telecommunications and signal processing, baseband is an adjective that describes signals and systems whose range of frequencies is measured from close to 0 hertz to a cut-off frequency, a maximum bandwidth or highest signal frequency; it is sometimes used as a noun for a band of frequencies starting close to zero. Baseband can often be is the term's antonym In lexical semantics, opposites are words that lie in an inherently incompatible binary relationship as in the opposite pairs male : female, long : short, up : down, and precede : follow. The notion of incompatibility here refers to fact that one word in an opposite pair entails that it is not the other pair member. For example, something that is, referring to a single channel of analog video, typically in composite Composite video is the format of an analog television signal before it is combined with a sound signal and modulated onto an RF carrier form with separate baseband In telecommunications and signal processing, baseband is an adjective that describes signals and systems whose range of frequencies is measured from close to 0 hertz to a cut-off frequency, a maximum bandwidth or highest signal frequency; it is sometimes used as a noun for a band of frequencies starting close to zero. Baseband can often be audio Sound recording and reproduction is an electrical or mechanical inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects. The two main classes of sound recording technology are analog recording and digital recording. Acoustic analog recording is achieved by a small microphone diaphragm that .[4] The act of demodulating converts broadband video to baseband video.
However, broadband video in the context of streaming Streaming media are multimedia that are constantly received by, and normally presented to, an end-user while being delivered by a streaming provider . The name refers to the delivery method of the medium rather than to the medium itself. The distinction is usually applied to media that are distributed over telecommunications networks, as most Internet video has come to mean video files that have bitrates high enough to require broadband Internet access in order to view them.
Broadband video is also sometimes used to describe IPTV Video on demand.[5]
See also
- Narrowband
- Wideband
- Mobile broadband
- Ultra-wideband
- Full service broadband
- Wireless broadband
- National broadband plans from around the world
- Broadband Integrated Services Digital Network
- BISDN
References
- ^ "What Constitutes Broadband?". accel-networks.com. http://www.accel-networks.com/blog/2009/09/what-constitutes-broadband.html. Retrieved 2009-09-25.
- ^ a b broadband - Definitions from Dictionary.com
- ^ Home Technology Integration and Cedia Installer I By Ron Gilster, Helen Heneveld
- ^ Cabling Installation & Maintenance
- ^ The Guardian: BT Vision boasts 150,000 customers
External links
Categories: Digital technology | Broadband
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