Terabit Ethernet
Terabit Ethernet or TbE is used to describe future speeds of Ethernet above 100 Gbit/s. As of 2015[update], 400 Gigabit Ethernet is under development, using broadly similar technology to 100 Gigabit Ethernet, but 1 Terabit Ethernet is not.[1]
Contents
History
Facebook and Google, among other companies, have expressed a need for TbE.[2] However, TbE would require different technology, while a speed of 400 Gbit/s is achievable with existing technology, unlike 1 Tbit/s (1000 Gbit/s).[3][1] Accordingly, at the IEEE Industry Connections Higher Speed Ethernet Consensus group meeting in 2012 September, 400 GbE was chosen as the next generation goal.[1]
The University of California, Santa Barbara (UCSB) attracted help from Agilent Technologies, Google, Intel, Rockwell Collins, and Verizon Communications to help with research into next generation ethernet.[4]
Development
The IEEE formed the "IEEE 802.3 Industry Connections Ethernet Bandwidth Assessment Ad Hoc", to investigate the business needs for short and long term bandwidth requirements.[5][6][7]
IEEE 802.3's "400 Gb/s Ethernet Study Group" started working on the 400 Gbit/s generation standard in March 2013.[8] Results from the study group were published and approved on March 27th, 2014. Subsequently, the IEEE 802.3bs Task Force[9] started working to provide physical layer specifications for several link distances.[10] Standards are expected in December 2017.[11]
Project objectives
Like all speeds since 10 Gigabit Ethernet, the standard will support only full-duplex operation. Other objectives include:[10]
- Support MAC data rate of 400 Gbit/s
- Preserve the Ethernet frame format utilizing the Ethernet MAC
- Preserve minimum and maximum frame size of current Ethernet standard
- Define physical layer specifications that support link distances of:
- at least 100 m over multi-mode fiber (400GBASE-SR16)[12]
- at least 500 m over single-mode fiber (400GBASE-DR4)[13][14]
- at least 2 km over single-mode fiber (400GBASE-FR8)[13][15][16]
- at least 10 km over single-mode fiber (400GBASE-LR8)[13][17]
- Support a bit error ratio (BER) of 10-13, which is an improvement over the 10-12 BER that was specified for 10GbE, 40GbE, and 100GbE.
- Support for OTN (transport of Ethernet across optical transport networks), and optional support for Energy-Efficient Ethernet (EEE).
See also
- Ethernet Alliance
- Optical interconnect
- Interconnect bottleneck
- Optical fiber cable
- Optical communication
- Parallel optical interface
References
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- IEEE Reports
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External
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- ↑ IEEE 802.3bs Task Force
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- ↑ 100m MMF draft proposal
- ↑ 13.0 13.1 13.2 IEEE 802.3 Ethernet Working Group Liaison letter to ITU-T Questions 6/15 and 11/15
- ↑ 400G-PSM4: A Proposal for the 500m Objective using 100 Gbps per Lane Signaling
- ↑ Proposal for 400GE Optical PMD for 2km SMF Objective based on 4 x 100G PAM4
- ↑ Baseline Proposal for 8 x 50G NRZ for 400GbE 2km and 10km PMD
- ↑ Baseline Proposal for 8 x 50G NRZ for 400GbE 2km and 10km PMD
