Baud

4 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  baud \baud\ (b[add]d or b[^o]d), n. [Named after J. M. E.
     Baudot, a French inventor, died 1903.] (Computers,
     telecommunications)
     A unit of transmission speed for information conveyed over a
     digital communications channel, usually taken as equal to the
     number of bits of information transmitted per second. The


     speed in bauds indicates the number of signalling events per
     second; however, since it is necessary in most cases to
     transmit control information along with the data, the {data
     signalling rate} may be smaller than the baud rate.
     [PJC]

From WordNet (r) 2.0 [wn]:

  baud
       n : (computer science) a data transmission rate (bits/second)
           for modems [syn: {baud rate}]

From Jargon File (4.3.1, 29 Jun 2001) [jargon]:

  baud /bawd/ n. [simplified from its technical meaning] n. Bits per
     second. Hence kilobaud or Kbaud, thousands of bits per second. The
     technical meaning is `level transitions per second'; this coincides with
     bps only for two-level modulation with no framing or stop bits. Most
     hackers are aware of these nuances but blithely ignore them.
  
     Historical note: `baud' was originally a unit of telegraph signalling
     speed, set at one pulse per second. It was proposed at the November,
     1926 conference of the Comite' Consultatif International Des
     Communications Te'le'graphiques as an improvement on the then standard
     practice of referring to line speeds in terms of words per minute, and
     named for Jean Maurice Emile Baudot (1845-1903), a French engineer who
     did a lot of pioneering work in early teleprinters.
  
  

From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:

  baud
       
           /bawd/ (plural "baud") The unit in
          which the information carrying capacity or "{signalling rate}"
          of a communication channel is measured.  One baud is one
          symbol (state-transition or level-transition) per second.
          This coincides with bits per second only for two-level
          {modulation} with no {framing} or {stop bits}.
       
          A symbol is a unique state of the communication channel,
          distinguishable by the receiver from all other possible
          states.  For example, it may be one of two voltage levels on a
          wire for a direct digital connection or it might be the phase
          or frequency of a carrier.
       
          The term "baud" was originally a unit of telegraph signalling
          speed, set at one {Morse code} dot per second.  Or, more
          generally, the reciprocal of the duration of the shortest
          signalling element.  It was proposed at the International
          Telegraph Conference of 1927, and named after {J.M.E. Baudot}
          (1845-1903), the French engineer who constructed the first
          successful teleprinter.
       
          The UK {PSTN} will support a maximum rate of 600 baud but each
          baud may carry between 1 and 16 bits depending on the coding
          (e.g. {QAM}).
       
          Where data is transmitted as {packets}, e.g. characters, the
          actual "data rate" of a channel is
       
          	R D / P
       
          where R is the "raw" rate in bits per second, D is the number
          of data bits in a packet and P is the total number of bits in
          a packet (including packet overhead).
       
          The term "baud" causes much confusion and is usually best
          avoided.  Use "bits per second" (bps), "bytes per second" or
          "characters per second" (cps) if that's what you mean.
       
          (1998-02-14)