Dictionary:

baud

  (bôd)

A unit of speed in data transmission equal to one bit per second.

[After Jean Maurice Emile Baudot (1845–1903), French engineer.]

The signaling rate of a line, which is the number of transitions (voltage or frequency changes) that are made per second. The term has often been erroneously used to specify bits per second. However, only at very low speeds is baud equal to bps; for example, 300 baud is the same as 300 bps. Beyond that, one baud can be made to represent more than one bit. For example, a V.22bis modem generates 1,200 bps at 600 baud.

Measurement of the speed of a modem, specifically the number of times per second a communications channel changes the carrier signal it sends on the phone line. A 56,000-baud (56K) modem changes the signal 56,000 times a second. Baud is often confused with bits per second (Bps); technically, they are different measurements.

[Etymology: J. M. E. Baudot; France 1845-1903] electromagnetics, informatics In telegraphy and other digital signalling, the time between representative samplings of the signal, during which any transition of signal state occurs, for example a hundredth of a second. A transmission line with such a rate of transition/reading would invariably be called a ‘100-baud’ line; in such an expression the baud becomes a rate rather than the original time element. Since virtually all telegraphy and most similar transmission until recently used only two levels for transition, each baud accommodated just 1 bit; hence a 100-baud line was often referred to as being of 100 bits per second. In reality, most lines of such magnitude dissipate from 10 to over 30% of their capacity on asynchronous signal control, so the translation to bits is quite exaggerated to the user. Modern high-speed circuits dissipate very little, so the nominal figure is not significantly misleading; however, its transition/reading scheme may be very different, with perhaps eight levels communicating three bits per baud on a ‘4 800-baud’ line (i.e. sampled every ¹/₄₈₀₀ s = 208.33~ μs), giving 14.4 kilobits per second (numerically far in excess of the 4 000 Hz bandwidth usually provided for a standard telephone circuit). More levels, and hence greater multiplication from baud rate to bit rate, are increasingly common as greater transmission rates are pursued. There is no absolute limit to the number of discernible transitions (hence bits per baud) or to the number of bauds or samples per second for any line circuit. The quality of the circuit and its equipment is the sole arbiter. Higher rates often involve error detection/correction techniques that reduce the effective transfer rate through both control and re-transmission, but often use data compression techniques that enhance the effective rate even more.

See also kibi-.

(transmission Rate Of A Communications Channel Or Device)

Dansk (Danish)
n. - baud

idioms:

• baud rate    baudhastighed

Nederlands (Dutch)
1 bit per seconde (computer)

Français (French)
n. - baud

idioms:

• baud rate    vitesse en bauds

Deutsch (German)
n. - Baud, (Einheit der Telegraphiergeschwindigkeit)

idioms:

• baud rate    Baudrate

Ελληνική (Greek)
n. - μονάδα ταχύτητας μετάδοσης δεδομένων

idioms:

• baud rate    ταχύτητα μετάδοσης δεδομένων

Italiano (Italian)
unità di trasmissione dati

Português (Portuguese)
n. - baud (medida de transmissão de dados) (Inf.)

Русский (Russian)
бод

Español (Spanish)
n. - baudio

idioms:

• baud rate    velocidad de transmisión de datos (en baudios)

Svenska (Swedish)
n. - baud (måttenhet för överföringshastighet)

中文（简体） (Chinese (Simplified))
波特

idioms:

• baud rate    传输速率

中文（繁體） (Chinese (Traditional))
n. - 波特

idioms:

• baud rate    傳輸速率

한국어 (Korean)
n. - 보드(데이터 처리 속도의 단위)

日本語 (Japanese)
n. - ボー

العربيه (Arabic)
‏(الاسم) وحدة قياس, الأرسال التلغرافي‏

עברית (Hebrew)
n. - ‮באוד (יחידת מהירות) - סיבית לשניה‬

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