Definition: Terabit Ethernet

Terabit Ethernet is Ethernet transmission at one trillion bits per second (1 Tbps). True Terabit Ethernet is a future technology; however, in the meantime, Terabit Ethernet generally refers to Ethernet above 100 Gbps. The IEEE 802.3bs task force has defined 200 Gigabit (200GBASE) and 400 Gigabit Ethernet (400GBASE), which are expected to be commonly deployed by carriers and large enterprises by 2020. See 100 Gigabit Ethernet and Ethernet.

 Distance
   in                             No. of
 Meters  Fiber Mode  Designation  Fibers

          200 GbE
  500    Singlemode  200GBASE-DR4    4
  2 km   Singlemode  200GBASE-FR4    4
  10 km  Singlemode  200GBASE-LR4    4

          400 GbE
  100    Multimode   400GBASE-SR16  16
  500    Singlemode  400GBASE-DR4    4
  2 km   Singlemode  400GBASE-FR8    8
  10 km  Singlemode  400GBASE-LR8    8