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In
telecommunications
Broadband
in telecommunications is a term that refers to a signaling
method that includes or handles a relatively wide
range 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 bandwidth, 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 without losing the high audio frequencies
required for realistic sound reproduction. A television
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 a modem will transmit a bandwidth
of 64 kilobits per seconds (kbit/s) over a telephone
line; over the same telephone line a bandwidth of
several megabits per second can be handled by ADSL,
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, for example).
In data communications
Broadband
in data communications can refer to broadband networks
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 56,000 bits per
second.
However,
broadband in data communications 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 actual data rate. In network engineering this term
is used for methods where two or more signals share
a medium.
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.
In DSL
The
various forms of Digital Subscriber Line (DSL) services
are broadband in the sense that digital information
is sent over a high-bandwidth channel 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 provisioned over cable modem is a common
alternative to DSL. (Credit:
Wikipedia).
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