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1 definition found
 for half-duplex
From The Free On-line Dictionary of Computing (30 December 2018) :

  half-duplex
  hdx
  
      (hdx, from telegraphy) 1. A type of
     communication channel using a single circuit which can carry
     data in either direction but not both directions at once.
  
     Compare: simplex, full-duplex.
  
     2. An obsolete term for local echo.
  
     (2001-07-21)
  

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