What is Broadband
In telecommunication
Broadband in telecommunication refers to a signaling method that includes or handles a relatively wide range (or band) of frequencies, which may be divided into channels or frequency bins. Broadband is always a relative term, understood according to its context. The wider the bandwith, the greater the information-carrying capacity. In radio, for example, a very narrow-band signal will carry Morse code; a broader band will carry speech; a still broader band is required to carry music audio frequency required for realistic sound reproduction. A analog modem over the same telephone line a bandwidth of several megabits per second can be handled by ASDL, which is described as broadband (relative to a modem over a telephone line, although much less than can be achieved over a fiber optic circuit). without losing the high 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 will transmit a bandwidth of 56 kilobits per seconds (kbit/s) over a
In data communications
Broadband in data can refer to broadband network or broadband internet and may have the same meaning as above, so that data transmission over a fiber optic cable would be referred to as broadband as compared to a telephone modem operating at 56000 bite per second. However, a worldwide standard for what level of bandwidth and network speeds actually constitute Broadband has not been determined.
However, broadband in data commuication 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 network engineering this term is used for methods where two or more signals share a medium.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 DSL services are broadband in the sense that digital information is sent over a high-bandwidth channel (located above the baseband voice channel on a single pair of wires).
In Ethernet
A baseband transmission sends one type of signal using a medium's full bandwidth, as in 100BASE-T Ethernet. 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 is a common alternative to DSL.
In power-line communication
Power Line have also been used for various types of data communication. Although some systems for remote control are based on narrowband signaling, modern high-speed systems use broadband signaling to achieve very high data rates. One example is the ITU-T G.hn standard, which provides a way to create a high-speed (up to 1 Gigabit/s). LAN using existing home wiring (including power lines, but also phone lines and coaxial cable).
In video
Broadband in analog video distribution is traditionally used to refer to systems such as cable television, where the individual channels are modulated on carriers at fixed frequencies.In this context, baseband is the term's antonym, referring to a single channel of analog video, typically in composite form with an audio subcarrier.The act of demodulating converts broadband video to baseband video.
However, broadband video in the context of streaming 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
