Source : Free On-Line Dictionary of Computing

DS2
     
         A {DS level} and {framing specification} for
        digital signals in the North American digital transmission
        hierarchy.  A DS2 signal uses 96 {PCM} channels and has a
        transmission rate of 6.31 Megabits per second, twice that of
        {DS1C}.
     
        (1995-02-07)