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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). INTRODUCTION 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. |
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