Gigabit Ethernet

Computer NetworkComputer EngineeringMCA

In computer networks, Gigabit Ethernet (GbE) is the family of Ethernet technologies that achieve theoretical data rates of 1 gigabit per second (1 Gbps). It was introduced in 1999 and was defined by the IEEE 802.3ab standard.

Varieties of Gigabit Ethernet

The popular varieties of fast Ethernet are 1000Base-SX, 1000Base-LX, 1000BASE-T and 1000Base-CX.

1000BASE-CX

  • Defined by IEEE 802.3z standard
  • The initial standard for Gigabit Ethernet
  • Uses shielded twisted pair cables with DE-9 or 8P8C connector
  • Maximum segment length is 25 metres
  • Uses NRZ line encoding and 8B/6B block encoding

1000BASE-SX

  • Defined by IEEE 802.3z standard
  • Uses a pair of fibre optic cables of a shorter wavelength having 770 – 860 nm diameter
  • The maximum segment length varies from 220 – 550 metres depending upon the fiber properties.
  • Uses NRZ line encoding and 8B/10B block encoding

1000BASE-LX

  • Defined by IEEE 802.3z standard
  • Uses a pair of fibre optic cables of a longer wavelength having 1270 – 1355 nm diameter
  • Maximum segment length is 500 metres
  • Can cover distances up to 5 km
  • Uses NRZ line encoding and 8B/10B block encoding

1000BASE-T

  • Defined by IEEE 802.3ab standard
  • Uses a pair four lanes of twisted-pair cables (Cat-5, Cat-5e, Cat-6, Cat‑7)
  • Maximum segment length is 100 metres
  • Uses trellis code modulation technique
raja
Published on 30-Aug-2019 13:58:02
Advertisements