The term broadband can have different meanings in different contexts. The term's meaning has undergone substantial shifts.
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In telecommunication
Broadband in telecommunications Telecommunication is the assisted transmission over a distance for the purpose of communication. In earlier times, this may have involved the use of smoke signals, drums, semaphore, flags or heliograph. In modern times, telecommunication typically involves the use of electronic devices such as the telephone, television, radio or computer. Early 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, 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 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, 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 type of character encoding that transmits telegraphic information using rhythm. Morse code uses a standardized sequence of short and long elements to represent the letters, numerals, punctuation and special characters of a given message. The short and long elements can be formed by sounds, marks, or pulses, in on off keying and are; a broader band will carry speech; a still broader band is required to carry music Music is an art form whose medium is sound organized in time. 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 Commercially available since the late 1930s, the television set has become a common communications receiver in homes, businesses and institutions, particularly as a source of entertainment and news. Since the 1970s the availability of video cassettes, laserdiscs, DVDs and now Blu-ray discs, have resulted in the television set frequently being used antenna described as "normal" may be capable of receiving a certain range of channels; one described as "broadband" will receive more channels. In data communications an analogue modem 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 bandwidth of 56 kilobits per seconds (kbit/s) over a 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; over the same telephone line a bandwidth of several megabits per second can be handled by ADSL Asymmetric Digital Subscriber Line is a form of DSL, 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 microfilter - allows a single telephone, which is described as broadband (relative to a modem over a telephone line, although much less than can be achieved over a fibre optic An optical fiber is a glass or plastic fiber that carries light along its length. Fiber optics is the overlap of applied science and engineering concerned with the design and application of optical fibers. Optical fibers are widely used in fiber-optic communications, which permits transmission over longer distances and at higher bandwidths (data circuit).
In data communications
Broadband in data Data are pieces 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 knowledge are 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 high data rate Internet access—typically contrasted with dial-up access over 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 fibers, wireless communication media, and storage media. The data is often represented as an electro-magnetic signal, such as an over a fiber optic An optical fiber is a glass or plastic fiber that carries light along its length. Fiber optics is the overlap of applied science and engineering concerned with the design and application of optical fibers. Optical fibers are widely used in fiber-optic communications, which permits transmission over longer distances and at higher bandwidths (data cable would be referred to as broadband as compared to a telephone modem 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, their use declining as broadband technologies such as DSL 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, broadband in data communications Computer networking is the engineering discipline concerned with communication between computer systems or devices. Networking, routers, routing protocols, and networking over the public Internet have their specifications defined in documents called RFCs. Computer networking is sometimes considered a sub-discipline of telecommunications, computer 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.[1]
In DSL
The various forms of digital subscriber line DSL or xDSL 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, but as of 2009[update] the term digital subscriber line has been widely adopted[by whom?] as a more marketing-friendly term for ADSL, the most popular version of consumer- (DSL) services are broadband in the sense that digital information is sent over a high-bandwidth channel (located above the baseband In telecommunications and signal processing, baseband is an adjective that describes signals and systems whose range of frequencies is measured from zero to a maximum bandwidth or highest signal frequency; it is sometimes used as a noun for a band of frequencies starting at zero. It can often be considered as synonym to lowpass, and antonym to voice channel on a single pair of wires).[1]
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 zero to a maximum bandwidth or highest signal frequency; it is sometimes used as a noun for a band of frequencies starting at zero. It can often be considered as synonym to lowpass, and antonym to transmission sends one type of signal using a medium's full bandwidth, as in 100BASE-T Ethernet Ethernet is a family of frame-based computer networking technologies for local area networks . The name comes 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, through means of network access at the Media Access Control (MAC) /Data Link Layer, and a. 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 modem that provides bi-directional data communication via radio frequency channels on a cable television 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 cable television network. They are commonly deployed in 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), is a system for carrying data on a conductor also used for electric power transmission. Broadband over Power Lines (BPL) uses PLC by sending and receiving have also been used for various types of data communication. Although some systems for remote control are based on narrowband Narrowband refers to a situation in radio communications where the bandwidth of the message does not significantly exceed the channel's coherence bandwidth. It is a common misconception that narrowband refers to a channel which occupies only a "small" amount of space on the radio spectrum 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 The first Recommendation for G.hn is G.9960, which received consent on Dec 12th 2008. The work is being done in the ITU-T Telecommunication Standardization Sector, Study Group 15, Question 4. Over 20 companies are participating regularly representing a broad cross section of the communications industry including some of the worlds largest 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 group 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 place, and lack of a need for leased using existing home wiring (including power lines, but also phone lines and coaxial cables The first Ethernet standard, IEEE 802.3, specified baseband operation over coaxial cable. The use of coaxial cable for Ethernet is still supported by the standard, but rarely used because coaxial cable is more costly to purchase, install, and operate for Local Area Networks).
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 that small fluctuations in the signal are meaningful. Analog is usually thought of in an electrical context; 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 Modulation is the process of varying one waveform in relation to another waveform. In telecommunications, modulation is used to convey a message, or a musician may modulate the tone from a musical instrument by varying its volume, timing and pitch. Often a high-frequency sinusoid waveform is used as carrier signal to convey a lower frequency on carriers at fixed frequencies.[2] 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 zero to a maximum bandwidth or highest signal frequency; it is sometimes used as a noun for a band of frequencies starting at zero. It can often be considered as synonym to lowpass, and antonym to 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 an 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 subcarrier A subcarrier is a separate analog or digital signal carried on a main radio transmission, which carries extra information such as voice or data. More technically, it is an already-modulated signal, which is then modulated into another signal of higher frequency and bandwidth. This is an early and simple method of multiplexing.[3] The act of demodulating converts broadband video to baseband video.
However, broadband video in the context of streaming However, computer networks were still limited, and media was usually delivered over non-streaming channels, such as by downloading a digital file from a remote web server and then saving it to a local drive on the end user's computer or storing it as a digital file and playing it back from CD-ROMs Internet The Internet is a global system of interconnected computer networks that use the standardized Internet Protocol Suite . It is a network of networks that consists of millions of private and public, academic, business, and government networks of local to global scope that are linked by copper wires, fiber-optic cables, wireless connections, and video has come to mean video files that have bitrates In telecommunications and computing, bitrate is the number of bits that are conveyed or processed per unit of time high enough to require broadband Internet access Broadband Internet access, often shortened to just broadband, is high data rate Internet access—typically contrasted with dial-up access over a 56k modem in order to view them.
Broadband video is also sometimes used to describe IPTV IPTV is a system where a digital television service is delivered using Internet Protocol over a network infrastructure, that is, a broadband connection. A general definition of IPTV is television content that, instead of being delivered through traditional broadcast and cable formats, is received by the viewer through the technologies used for Video on demand.[4]
See also
References
- ^ 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
Categories: Telecommunications | Digital technology | Broadband
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Q. Currently with virgin media, I am planning to switch to a new account. I value speed very much since there is 6 people using computer in the house. Unfortunately, having no phone line in the house, we found not so many choices out there for us. Plz help me to find out which companies do broadband without phone line.
Asked by flnguitar - Mon Sep 8 09:05:30 2008 - - 4 Answers - 0 Comments
A. I presume you mean you want broadband to go with an existing phone line, not something mobile like 3, Vodafone, Orange or T-Mobile (none of which I'd recommend, due to cost). Try Think Broadband if you already have a phone line - they will point you in the direction of the cheapest, and tell you what other requirements there are.
Answered by Simon C - Mon Sep 8 09:09:24 2008
