25 Gigabit Ethernet
25 Gigabit Ethernet (25GbE) and 50 Gigabit Ethernet (50GbE) are proposed standards for Ethernet connectivity in a datacenter environment. An industry consortium (25G Ethernet Consortium [1]) was formed in July 2014 to support the specification of single-lane 25 Gigabit Ethernet and dual-lane 50 Gigabit Ethernet technology. In November 2014, an IEEE 802.3 task force was formed to develop a single-lane 25 Gigabit Ethernet standard,[2][3] and in November 2015, an IEEE 802.3 study group was formed to explore the development of a single-lane 50 Gigabit Ethernet standard.[4]
The 25G Ethernet Consortium specification draft was completed in September 2015 and uses technology from IEEE Std. 802.3ba and IEEE Std. 802.bj.
The IEEE 802.3 draft standard uses technology defined for 100 Gigabit Ethernet implemented as four 25-Gbit/s lanes (IEEE 802.3bj).[5][6] The IEEE P802.3by task force[7] with the objectives to define:[8]
- a single-lane 25 Gbit/s 25GBASE-KR PHY for printed circuit backplanes
- a single-lane 25 Gbit/s 25GBASE-CR-S PHY for 3 m twin-ax cables (in-rack)
- a single-lane 25 Gbit/s 25GBASE-CR-L PHY for 5 m twin-ax cables (inter-rack)
- a single-lane 25 Gbit/s 25GBASE-SR PHY for 100 m OM4 or 70 m OM3 multi-mode optical fiber
The IEEE 802.3by standard is expected by September 2016.[9]
A 25 Gbit/s standard over twisted pair 25GBASE-T is being developed alongside 40GBASE-T within IEEE 802.3bq.[10]
References
- ↑ http://www.25gethernet.org/
- ↑ Rick Merritt (2014-07-21). "25G Ethernet on Tap at IEEE". Retrieved 2014-09-29.
- ↑ "IEEE 802.3 25 Gb/s Ethernet Study Group Public Area". IEEE 802.3. 2014-10-29. Retrieved 2014-12-31.
- ↑ http://www.ieee802.org/3/50G/
- ↑ "Overview 25G & 50G Ethernet Specification, Draft 1.4" (PDF). 25G Ethernet Consortium. 2014-09-11. Retrieved 2014-12-31.
- ↑ Stephen Hardy (July 23, 2014). "IEEE launches 25 Gigabit Ethernet Study Group". LightWave. Retrieved 2014-09-29.
- ↑ IEEE 802.3by 25 Gb/s Ethernet Task Force
- ↑ http://www.ieee802.org/3/by/P802_3by_Objectives.pdf
- ↑ "IEEE 802.3by Task Force Timeline" (PDF).
- ↑ "IEEE P802.3bq 25G/40GBASE-T Task Force". Retrieved 2016-02-08.
External links
- 25G Ethernet Consortium
- "What is 25 Gigabit Ethernet and why would you want it?". Retrieved 2014-09-29.
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