x2

1 definition found

x2 - Free On-line Dictionary of Computing (26 May 2007) :

  X2
  
     <protocol> A proprietary modem standard developed by US Robotics
      for 56 kbps communications.  Not taken up as
     widely as K56flex and will shortly be superseded by the
     official V.90 standard.
  
     (1998-09-08)