baud

4 definitions found

baud - Collaborative International Dictionary of English v.0.48 :

  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]

baud - WordNet (r) 2.1 (2005) :

  baud
      n 1: (computer science) a data transmission rate (bits/second)
           for modems [syn: baud, baud rate]

baud - Free On-line Dictionary of Computing (26 May 2007) :

  baud
  baud rate
  
     <communications, unit> /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)
  

baud - Jargon File (4.4.4, 14 Aug 2003) :

  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 Telegraphiques 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.