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, greater is 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
fibre optic circuit, for example).
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<
communications> A class of communication channel capable of supporting a wide range of frequencies, typically from audio up to video frequencies. A broadband channel can carry multiple signals by dividing the total capacity into multiple, independent bandwidth channels, where each channel operates only on a specific range of frequencies.
The term has come to be used for any kind of
Internet connection with a
download speed of more than 56
kbaud, usually some kind of
Digital Subscriber Line, e.g.
ADSL.
See also
baseband,
narrowband.
(2003-10-15)
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