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sources/news/20200418 Ethernet consortium announces completion of 800GbE spec.md
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[#]: collector: (lujun9972)
[#]: translator: (geekpi)
[#]: reviewer: ( )
[#]: publisher: ( )
[#]: url: ( )
[#]: subject: (Ethernet consortium announces completion of 800GbE spec)
[#]: via: (https://www.networkworld.com/article/3538529/ethernet-consortium-announces-completion-of-800gbe-spec.html)
[#]: author: (Andy Patrizio https://www.networkworld.com/author/Andy-Patrizio/)
Ethernet consortium announces completion of 800GbE spec
======
The specification for 800GbE doubles the maximum speed of the current Ethernet standard, but also tweaks other aspects including latency.
Martyn Williams/IDGNS
The industry-backed Ethernet Technology Consortium has announced the completion of a specification for 800 Gigabit Ethernet technology.
Based on many of the technologies used in the current top-end 400 Gigabit Ethernet protocol, the new spec is formally known as 800GBASE-R. The consortium that designed it (then known as the 25 Gigabit Ethernet Consortium) was also instrumental in developing the 25, 50, and 100 Gigabit Ethernet protocols and includes Broadcom, Cisco, Google, and Microsoft among its members.
**[ Now see [the hidden cause of slow internet and how to fix it][1].]**
The 800GbE spec adds new media access control (MAC) and physical coding sublayer (PCS) methods, which tweaks these functions to distribute data across eight physical lanes running at a native 106.25Gbps. (A lane can be a copper twisted pair or in optical cables, a strand of fiber or a wavelength.)  The 800GBASE-R specification is built on two 400 GbE 2xClause PCSs to create a single MAC which operates at a combined 800Gbps.
And while the focus is on eight 106.25G lanes, it's not locked in. It is possible to run 16 lanes at half the speed, or 53.125Gbps.
The new standard offers half the latency of 400G Ethernet specification, but the new spec also cuts the forward error correction (FEC) overhead on networks running at 50 Gbps, 100 Gbps, and 200 Gbps by half, thus reducing the packet-processing load on the NIC.
By lowering latency this will feed the need for speed in latency-sensitive applications like [high-performance computing][2] and artificial intelligence, where lots of data needs to be moved around as fast as possible.
[][3]
Doubling from 400G to 800G wasn’t too great of a technological leap. It meant adding more lanes at the same transfer rate, with a few tweaks. But breaking a terabit, something Cisco and other networking firms have been talking about for a decade, will require a significant reworking of the technology and won’t be an easy fix.
It likely won’t be cheap, either. 800G works with existing hardware and 400GbE switches are not cheap, running as high as six figures. Moving past the terabit barrier with a major revision to the technology will likely be even more expensive. But for hyperscalers and HPC customers, that’s par for the course.
The ETC didn’t say when to expect new hardware supporting the 800G, but given its modest change to existing specs, it could appear this year, assuming the pandemic-induced shutdown doesn’t throw a monkey wrench into plans.
Join the Network World communities on [Facebook][4] and [LinkedIn][5] to comment on topics that are top of mind.
--------------------------------------------------------------------------------
via: https://www.networkworld.com/article/3538529/ethernet-consortium-announces-completion-of-800gbe-spec.html
作者：[Andy Patrizio][a]
选题：[lujun9972][b]
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://www.networkworld.com/author/Andy-Patrizio/
[b]: https://github.com/lujun9972
[1]: https://www.networkworld.com/article/3107744/internet/the-hidden-cause-of-slow-internet-and-how-to-fix-it.html
[2]: https://www.networkworld.com/article/3444399/high-performance-computing-do-you-need-it.html
[3]: https://www.networkworld.com/blog/itaas-and-the-corporate-storage-technology/?utm_source=IDG&utm_medium=promotions&utm_campaign=HPE22140&utm_content=sidebar (ITAAS and Corporate Storage Strategy)
[4]: https://www.facebook.com/NetworkWorld/
[5]: https://www.linkedin.com/company/network-world

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[#]: collector: (lujun9972)
[#]: translator: (geekpi)
[#]: reviewer: ( )
[#]: publisher: ( )
[#]: url: ( )
[#]: subject: (Ethernet consortium announces completion of 800GbE spec)
[#]: via: (https://www.networkworld.com/article/3538529/ethernet-consortium-announces-completion-of-800gbe-spec.html)
[#]: author: (Andy Patrizio https://www.networkworld.com/author/Andy-Patrizio/)
以太网联盟宣布完成 800Gb 以太网规范
======
800Gb 以太网规范使当前以太网标准的最高速度提高了一倍，但同时也对包括延迟在内的其他方面进行了调整。
Martyn Williams/IDGNS
由业界支持的以太网技术联盟已宣布完成 800Gb 以太网技术规范。
它基于当前高端 400Gb 以太网协议中使用的许多技术，新规范正式称为 800GBASE-R。设计它的联盟（当时称为 25Gb 以太网联盟）在开发 25、50 和 100Gb 以太网协议方面也发挥了重要作用，其成员包括 Broadcom、Cisco、Google 和 Microsoft。
800Gb 以太网规范增加了新的媒体访问控制（MAC）和物理编码子层（PCS）方法，新规范对这些功能进行了调整，来使用 8 条 106.25Gbps 的物理通道分发数据。（通道可以是铜双绞线，也可以是光缆，一束光纤或光波。）800GBASE-R 规范建立在两个 400 GbE 2xClause PCS 之上，以创建一个以 800Gbps 的总速率运行的单个 MAC。
尽管主要是使用八条 106.25Gb 通道，但这并不是固定的。它可以以一半的速度 （53.125Gbps） 使用 16 条通道。
新标准提供了 400G 以太网规范的一半延迟，但是新规范也将运行在 50 Gbps、100 Gbps 和 200 Gbps 的网络上的前向纠错（FEC）开销减少了一半，从而减少了网卡上的数据包处理负担。
通过降低延迟，这将满足对延迟敏感的应用（例如[高性能计算][2]和人工智能）中对速度的需求，在这些应用中，需要尽可能快地移动大量数据。
[][3]
从 400G 增加到 800G 并不是技术上大的飞跃。这意味着要以相同的传输速率添加更多通道，并进行一些调整。但是，要想突破 Tb，Cisco 和其他网络公司已经讨论了十年了，这将需要对技术进行重大修改，而且并非易事。
新技术可能也不便宜。800G 可与现有硬件一起使用，而 400Gb 以太网交换机价格不菲，高达六位数。对技术进行重大修改，越过 Tb 障碍，可能会变得更加昂贵。但是对于大客户和高性能计算客户而言，这是预料之中的。
ETC 并未透露何时会支持 800G 的新硬件，但鉴于其对现有规格的适度更改，它可能会在今年出现，前提是疫情引起的停滞不会影响它。
加入 [Facebook][4] 和 [LinkedIn][5] 上的 Network World 社区，评论热门主题。
--------------------------------------------------------------------------------
via: https://www.networkworld.com/article/3538529/ethernet-consortium-announces-completion-of-800gbe-spec.html
作者：[Andy Patrizio][a]
选题：[lujun9972][b]
译者：[geekpi](https://github.com/geekpi)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://www.networkworld.com/author/Andy-Patrizio/
[b]: https://github.com/lujun9972
[2]: https://www.networkworld.com/article/3444399/high-performance-computing-do-you-need-it.html
[3]: https://www.networkworld.com/blog/itaas-and-the-corporate-storage-technology/?utm_source=IDG&utm_medium=promotions&utm_campaign=HPE22140&utm_content=sidebar (ITAAS and Corporate Storage Strategy)
[4]: https://www.facebook.com/NetworkWorld/
[5]: https://www.linkedin.com/company/network-world