Define speediness4/16/2023 ![]() ![]() For measurements of a meter, see metric system. ![]() Space/timeThe following units of measure are used to define digital capacities and speeds. For example, 100Base-T Ethernet is rated at 100 Mbps (megabits per second). (2) The speed at which audio and video files are encoded (compressed), measured in bits per second (see bit rate). The amplitude remains constant, unlike QAM modulation, in which the amplitude is varied (see QAM).ĭata rate (1) The speed at which data is transferred within the computer or between a peripheral device and the computer, measured in bytes per second. Each set of two input bits modifies the carrier into four phase angles. This quadrature PSK (QPSK) example is one of the simplest modulation schemes. See modulation, video bandwidth, space/time and bandwidth junkie. Any one of more than 30 combinations of channel bandwidth (20, 40 MHz), modulation scheme, error correction rate, channel spacing and number of antennas may be selected, on a packet-by-packet basis. This extremely wide range is determined by the signal strength and interference in the environment at any given moment. Using the 802.11n Wi-Fi example, the resulting bit rate can range from 6.5 Mbps to 600 Mbps. When using alternating frequencies for digital transmission, the frequencies are modified (modulated) by the digital input. The 20 and 40 MHz channel frequencies are the bandwidths, and each channel is divided into subchannels.įrom Hertz to Bits - A Complicated Process For example, 802.11n Wi-Fi transmits in 20 MHz and 40 MHz channels within the 2.4 GHz and 5 GHz bands. When transmitting alternating frequencies, as with all wired analog, many wired digital and most wireless communications, the bandwidth is the difference between the highest and lowest frequencies, measured in cycles per second, or Hertz (Hz). For example, Ethernet transmits at different speeds, including 10 Mbps, 100 Mbps and 1000 Mbps (see Mbps and baseband). Digital bandwidth is the number of pulses per second measured in bits per second (bps). (2) The transmission capacity of an electronic pathway such as a communications line, computer bus or computer channel. For example, "not enough bandwidth to get the job done" means not enough staff or time to do it. ![]() This article is provided by FOLDOC - Free Online Dictionary of Computing ( ) bandwidth (1) Computer people may use the term for capability and time. ![]()
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