Line Designations

The following list shows some of the common line designations:

  • DS0 – 64 k­ilobits per second
  • ISDN – Two DS0 lines plus signaling (16 kilobytes per second), or 128 kilobits per second
  • T1 – 1.544 megabits per second (24 DS0 lines)
  • T3 – 43.232 megabits per second (28 T1s)
  • OC3 – 155 megabits per second (84 T1s)
  • OC12 – 622 megabits per second (4 OC3s)
  • OC48 – 2.5 gigabits per seconds (4 OC12s)
  • OC192 – 9.6 gigabits per second (4 OC48s)