broadband definition by Webster's New World
broadband definition by American Heritage Dictionary
- broadˈbandˌ noun
broadband - Computer Definition
- In the Wide Area Network (WAN) domain, broadband is an imprecise term referring to a circuit or channel providing a relatively large amount of bandwidth. The ITU-T defines broadband in Recommendation I.113 as a transmission rate faster than the primary rate (referring to ISDN), which translates into 1.544 Mbps in North America and 2.048 Mbps in most of the rest of the world.The U.S. Federal Communications Commission (FCC) does not define broadband, but defines high-speed services as supporting a data rate of at least 200 kbps in at least one direction and advanced telecommunications capability as at least 200 kbps in both directions. Asymmetric digital subscriber line (ADSL) generally is described as a broadband access technology, even though many ADSL services operate at less than T1 and E-1 rates. In this context, ADSL certainly operates at much higher rates than the predecessor modem technology, which operates at narrowband rates of less than 64 kbps. Relatively speaking, ADSL is broadband in nature, even at very low operating rates. See also bandwidth, FCC, ISDN, ITU-T, narrowband, and wideband.
- In the Local Area Network (LAN) domain, broadband refers to a multichannel RF-based (Radio Frequency-based) LAN, with the channels derived through frequency division multiplexing (FDM).The workstations and other attached digital devices access analog channels through radio frequency (RF) modems that accomplish the digital-to-analog conversion process. Broadband LANs commonly use 75-ohm CATV-type coax, and use CATV-style connectors, taps, filters, and amplifiers in a tree and branch topology, which essentially is a variation of the bus with multiple branches off of a main root bus, much as there are branches off of the main trunk of a tree.The only broadband LAN to gain any significant following was 10Broad36, which has long been considered obsolete. All other LANs are baseband in nature. See also 10Broad36, baseband, B-ISDN, bus topology, CATV, channel, FDM, LAN, and tree topology.
(1) High-speed transmission. The term commonly refers to Internet access via a variety of high-speed networks, including cable, DSL, FiOS, Wi-Fi, WiMAX, 3G, 4G and satellite, all of which are considerably faster than analog dial-up; in some cases by a huge magnitude. For example, a high-speed cable plan is more than a thousand times faster than dial-up, and a top FiOS plan is more than 3,000 times faster. The term has always referred to a higher-speed connection, but the speed threshold varies with the times. Widely employed in companies, the 1.5 Mbps T1 line was often considered the starting point for broadband speeds, while the FCC had defined broadband as a minimum upload speed of 200 Kbps. The T1 line is no longer the coveted connection for Web surfing. Home users with broadband service experience speeds many times that of T1. See broadband router, wireless broadband, T1, cable modem and DSL.
(2) Transmitting data by modulating a carrier wave in order to differentiate it from other signals in the air or in a single line. For example, frequency division multiplexing (see FDM) is used to carry hundreds of channels of analog and digital TV in a single coaxial cable. In this context, broadband is used in contrast with "baseband," which refers to data that have not been modulated or multiplexed (see baseband and TDM). However, in most cases, the term "broadband" means high-speed transmission as explained in definition #1 above.
broadband - Cultural Definition
In communications technology, the ability to send many signals over a single cable or other such communication medium. Broadband technology allows enormous amounts of data, such as that for movie videos, to be transferred over limited information infrastructure.
broadband - Investment & Finance Definition
A digital technology that gives users high-speed Internet access where data, e-mail, videos and music can be downloaded at speeds significantly faster than those available through dial-up modems. Often, broadband service is provided through cable lines from a cable telephone company. Another type of broadband connection, digital subscriber lines (DSL) provides high-speed broadband service using a special telephone line.