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).
Broadband in data communications 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 600 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.
Various forms of Digital Subscriber Line(DSL) services are broadband in the
sense that digital information is sent over one channel and voice over another
channel sharing a single pair of wires. Analog modems operating at speeds
greater than 600 bit/s are technically broadband. They obtain higher effective
transmission rates by using multiple channels with the rate on each channel
limited to 600 baud. For example, a 2400 bit/s modem uses four 600 baud channels
(see baud). This is in contrast to a baseband transmission where one type of
signal uses a medium's full bandwidth such as 100BASE-T Ethernet.
Ethernet, however, is the common user interface even to DSL data links. Ethernet
provisioned over cable modem often is a competitive alternative to DSL, especially in
the small office/home office market.
Users who need more than DSL or cable modem speeds will often use metro
ethernet, when available, rather than older and often more expensive (per
megabit) than T-carrier, E-carrier in appropriate parts of the world, or
Asynchronous Transfer Mode. Metro ethernet is usually implemented over a
metropolitan all-optical network.
Attributes and Credits
The information and facts supplied on this subject
derive from http://en.wikipedia.org/wiki/Main_Page
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).
Broadband in data communications 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 600 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.
Various forms of Digital Subscriber Line(DSL) services are broadband in the
sense that digital information is sent over one channel and voice over another
channel sharing a single pair of wires. Analog modems operating at speeds
greater than 600 bit/s are technically broadband. They obtain higher effective
transmission rates by using multiple channels with the rate on each channel
limited to 600 baud. For example, a 2400 bit/s modem uses four 600 baud channels
(see baud). This is in contrast to a baseband transmission where one type of
signal uses a medium's full bandwidth such as 100BASE-T Ethernet.
Ethernet, however, is the common user interface even to DSL data links. Ethernet
provisioned over cable modem often is a competitive alternative to DSL, especially in
the small office/home office market.
Users who need more than DSL or cable modem speeds will often use metro
ethernet, when available, rather than older and often more expensive (per
megabit) than T-carrier, E-carrier in appropriate parts of the world, or
Asynchronous Transfer Mode. Metro ethernet is usually implemented over a
metropolitan all-optical network.
Attributes and Credits
The information and facts supplied on this subject
derive from http://en.wikipedia.org/wiki/Main_Page
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