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10: Ethernet - Gigabit Ethernet over fiber optics & copper part 4


Gigabit Ethernet

Gigabit Ethernet
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In 1998, IEEE 803.2u standard (Fast Ethernet) running at the rate of 100Mb/s stands less strongly in front of the new powerful invented standard running at speed of 1000Mb/s IEEE 802.3z. Gigabit Ethernet has come with a plethora of versions listed as what follows : as for copper, we have 1000BASE-CX, 1000BASE-T, 1000BASE-T1, and 1000BASE-TX ; concerning fiber, there are 1000BASE-KK, 1000BASE-SX, 1000BASE-LX, 1000BASE-LX10, 1000BASE-EX, 1000BASE-BX10, 1000BASE-ZX.

Gigabit Ethernet over copper

1000BASE-CX is the first version of Gigabit ethernet over balanced shielded twisted pair using DE-9 or 8P8C (8 position 8 contact) connectors. The cable can reach no more than 25 metres.

Gigabit Ethernet over copper
1000BASE-T, Gigabit Ethernet version over copper wiring, was launched in 1999 as a IEEE 802.3ab standard. This standard support only CAT5, CAT5e, CAT6 or better. Besides, the cable cannot be stretched at a distance of more than 100 metres.

1000BASE-TX is a standard of Telecommunications Industry Association (TIA) operating over a 100 meters of a Category 6 twisted pair cabling (also known as (TIA/EIA-854); it is not much different from 1000BASE-T. The reason behind creating and promoting this standard is to achieve low complexity and to facilitate its implementation for multiple vendors.

 1000BASE-T is also a Gigabit Ethernet version over a single twisted pair, standardized in IEEE Std 802.3bp-2016. It was designed specially for cars’ cabling and other vehicles connections. The cable can reach about 15 m up to 40 m.

1000BASE-KX is IEEE 802.3ap, which was ratified in 2007 and became part of IEEE, standard operating over Backplane Ethernet. It supports 1000Mb/s and 10Gb/s  at a distance of one metre.

Gigabit Ethernet over fiber

1000BASE-SX is a version of Gigabit Ethernet, which uses 770 to 860 nm, near infrared (NIR) light wavelength, operating over multi-mode fiber optics .  This version is widely used in intra-building connections. It works at a distance of 220 m up to 550 m depending on the bandwidth.

Gigabit Ethernet over optical fiber

1000BASE-LX is a Gigabit Ethernet standard operating over fiber optics, using  a long wavelength laser  ranging from 1,270 to 1,355 nm. This standard is specified in IEEE 802.3 Clause 38. This standard can run over either-single mode or multi-mode optical fiber. As for single-mode fiber, it is specified to work over a distance of up to 5 km, whereas multi-mode fiber, it can reach up to 550 m.

1000BASE-LX10 was standardized as IEEE802.3ah in 2004, considered as part of the Ethernet in the First Mile task group, nearly similar to 1000BASE-LX. It was standardized six years after the emergence of fiber over Gigabit Ethernet. It works at a distance of 10 km over a pair of single-mode optical fiber.

1000BASE-BX10 is a Gigabit Ethernet version, was also standardized as IEEE802.3ah in 2004, as operating over a single strand of single-mode fiber. It works at a distance of 10 km. The wavelength is unequal in each direction, where it uses 1310 nm wavelength in transmitting upstream, and 1490 nm wavelength in transmitting downstream.

1000BASE-EX is a non-standard version of Gigabit Ethernet, however, it is industry accepted. The only difference between this version and 1000BASE-LX10 is the long distance that 1000BASE-EX sports, which is 40 km over a pair of single-mode fiber because of the cable quality. Besides, it runs on 1310 wavelength lasers.

1000BASE-ZX is also a non-standard but it is used to refer to Gigabit Ethernet version that uses 1,550 nm wavelength at a distance of 70 km over single-mode fiber. There are also some other vendors’ versions that can work at a distance of 120 km.

The next lesson is a sequel to this one
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10: Ethernet - Gigabit Ethernet over fiber optics & copper part 4 Reviewed by BOUFTIRA on 9:32:00 AM Rating: 5

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