v.21

1 definition found

v.21 - Free On-line Dictionary of Computing (26 May 2007) :

  V.21
  
     <protocol, standard> An ITU-T modem protocol for 300
     bps two-wire full-duplex communications using Frequency Shift Keying
      modulation.
  
     All modern modems support both V.21 and the close variant,
     Bell 103.
  
     (1996-07-22)