Ethernet Alliance

Ethernet Alliance Blog

Single Twisted Pair: The Next Frontier

By Steve Carlson

These days, a speed of 1Gb/s doesn’t seem particularly fast. With the IEEE carlson.jpg.75x75px802.3 Ethernet Working Group creating standards on speeds of 40Gb/s, 100Gb/s and now 400Gb/s, 1Gb/s is an unlikely candidate for a new standard. But that’s missing an important point: not all networks need to operate at the fastest possible speed. Speed is related to the needs of the application, and many applications are well served by what would now be considered low-speed links.

The IEEE P802.3bp 1000BASE-T1 PHY Task Force is developing a standard for full-duplex operation at 1Gb/s over a single twisted copper wire pair, operating in a severely constrained environment. The target market for this PHY is automotive networking, which will use hundreds of millions of Ethernet port in automobiles in the coming years. The 1Gb/s speed is very fast by the standards of current automotive networks and will allow automakers to deploy a vast number of new applications in infotainment, driver assist, and remote telematics.

It’s likely that the 1000BASE-T1 PHY will find homes in a wide variety of M2M and “Internet of Things” devices, especially when combined with IEEE 802.3bu Power over Data Lines Task Force that will deliver DC power over the same twisted wire pair.

The Task Force has been working away to define the special channels used in automotive, and is working to adopt PHY baselines-the most recent being PAM-3 coding at the Beijing meeting in March.

If this sounds interesting to you, come and join us at the May 801.2/802.3 joint interim, hosted by the Ethernet Alliance, in Norfolk, VA (

Steve Carlson, High Speed Design

Chair, IEEE 802.3bp 1000BASE-T1 Task Force



The views and opinions expressed in this blog are solely that of the individual(s) and should not be considered the views or positions of the Ethernet Alliance.


400 Gigabit Ethernet (GbE) Project Approved

By John D'Ambrosia

Yesterday, the IEEE P802.3bs 400GbE Project was approved.  With this approval the first Task Force meeting will be in Norfolk, VA, at the IEEE 802.3 / 802.1 Interim Meeting, which is coincidentally being hosted by the Ethernet Alliance.  For information regarding the meeting and registration, please see  The Task Force will begin its meeting on Monday, May 12.


For the past year the industry has been gathering at IEEE 802.3 400 Gb/s Ethernet Study Group meetings to determine the future of Ethernet’s next rate, 400GbE.  This is part of the next steps in the IEEE 802’s quest to develop market relevant standards for the networking industry.  The concept of market relevance is key at this point in history, as the application of networking in so many new ways is poised to revolutionize the world around us.  I would argue that market relevance is probably best summed up by the concept of market need, which must be considered on a case-by-case basis. 


For example, I personally don’t think that anyone is expecting 400GbE to ship in the same volumes as Gigabit Ethernet during its first 15 years of existence.  This does not diminish the market relevance of 400GbE, as the market relevance of “fat pipes” to support data aggregation at key points and nodes have grown in significance.  The IEEE Std 802.3baTM 40GbE and 100GbE standard, the last project that explored a higher speed Ethernet, ultimately introduced two new speeds of Ethernet – 40GbE for servers and 100GbE for networking, as the bandwidth requirements for networking were observed to be greater than computing / servers.  The IEEE 802.3 Bandwidth Assessment Ad hoc further vindicated these findings, predicting that in 2015 on average networks would need to support Terabit capacities or 10x the bandwidth requirements of 2010, and in 2020 on average networks would need to support 10 Terabit capacities or 100x the bandwidth requirements of 2010.


So as the pervasive nature of networking invades our lives, the need to support the aggregation of data has continued unabated.  And with the approval of the IEEE P802.3bs 400GbE Task Force, the industry is set to drive the development of 400GbE.  And the Ethernet Alliance is there!  The participants of its 400GbE Sub-Committee believe in the market relevance of 400GbE.  And that market relevance will drive the development of the latest IEEE 802.3 Ethernet standard that will be added into the IEEE 802 family.


The views and opinions expressed in this blog are solely that of the individual(s) and should not be considered the views or positions of the Ethernet Alliance.