• 300 bps - 1960s through 1983 or so
  • 1200 bps - Gained popularity in 1984 and 1985
  • 2400 bps
  • 9600 bps - First appeared in late 1990 and early 1991
  • 19.2 kilobits per second (Kbps)
  • 28.8 Kbps
  • 33.6 Kbps
  • 56 Kbps - Became the standard in 1998