GSM

• Time-division multiple access channel

  • Burst rate 270.833 kb/s
  • 8 timeslots/channel
  • 182.4 kb/s/channel (including FEC)

• Widespread in Europe, less so in US

• Circuit-switched data already deployed

  • 9.6 kb/s (sometimes 14.4 kb/s with less FEC)
  • dedicated air resource during call, wasteful for bursty packet traffic
  • no direct ISP connection, must dial modem pool

Previous slide

Next slide

Back to first slide

View graphic version