Tag Archive for 802.3

| July 23, 2016
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Ethernet Marches On

Ethernet Marches OnIt has been a while since we talked about networking on the Bach Seat. So it is time to get back to my roots. Ethernet continues to dominate the world. The Institute of Electrical and Electronics Engineers (IEEE) 802.3 Ethernet Working Group, the group responsible for the Ethernet standard, recently ratified 4 new Ethernet-related standards. The committee approved IEEE 802.3bp, IEEE 802.3bq, IEEE 802.3br, and IEEE 802.3by.

IEEE 802.3br has implications for IoT and connected cars. This new standard addresses the needs of industrial control system manufacturers and the automotive market by specifying a pre-emption methodology for time-sensitive traffic. IEEE 802.3bp addresses how Ethernet operates in harsh environments found in automotive and industrial applications.

The 2 more interesting new standards to networkers are IEEE 802.3bq and IEEE 802.3by. These standards help define how 25 GB and 40 GB Ethernet will work and more importantly how products from multiple vendors should interoperate in the data center. For a summary of the rationale for the new standard here is the IEEE presentation  (PDF).

Data c enterIEEE 802.3bq, “Standard for Ethernet Amendment: Physical Layer and Management Parameters for 25 Gb/s and 40 Gb/s Operation, Types 25GBASE-T and 40GBASE-T“, opens the door to higher-speed 25 Gb/s and 40 Gb/s twisted pair solutions with auto-negotiation capabilities and Energy Efficient Ethernet (EEE) support for data center applications.

IEEE 802.3by, “Standard for Ethernet Amendment: Media Access Control Parameters, Physical Layers, and Management Parameters for 25 Gb/s Operation”, introduces cost-optimized 25 Gb/s PHY specifications for single-lane server and switch interconnects for data centers.

Siemon’s Standards Informant explains that 25GBASE-T will be backward-compatible with existing BASE T technology and both 25GBASE-T and 40GBASE-T are planned for operation over TIA category 8 cabling. The deployment opportunity for 25GBASE-T is aligned with 40GBASE-T and defined as the same 2-connector, 30-meter reach topology supporting data center edge connections (i.e., switch to server connections in row-based structured cabling or top of rack configurations).

The standard’s ratification comes shortly after the Telecommunications Industry Association (TIA) approved its standard specifications for Category 8 cabling, the twisted-pair type designed to support 25GBase-T and 40GBase-T.

Though 25 Gigabit Ethernet is only now becoming an official standard, Enterprise Networking Planet reports that multiple vendors already have technologies in the market. Among the early adopter of 25 GbE is Broadcom (AVGO) which announced back in 2014 that its StrataXGS Tomahawk silicon would support 25 GbE. In 2015, Arista (ANET) announced its lineup of 25 GbE switches. Cisco (CSCO) is also embedding 25 GbE support in some of its switches including the Nexus 9516 switch.

That is where 25-Gb/s Ethernet comes in. It uses the same LC fiber cables and the SFP28 transceiver modules are compatible with standard SFP+ modules. This means that data-center operators can upgrade from 10 GbE to 25 GbE using the existing installed optical cabling and get a 2.5X increase in performance.

The IEEE 25GbE standard seems to have come out of nowhere, (especially considering the L O N G D R A W N O U T 8 0 2 . 1 1 n process but the technology actually came into being as the natural single-lane version of the IEEE 802.3ba 100-Gb/s Ethernet standard. The 100-Gb/s Ethernet standard uses four separate 25-Gb/s lanes running in parallel, so defining a single lane makes it a straightforward and natural subset of the 100-Gb/s standard.

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IEthernetEEE P802.3by and P802.3bq were initially targeted for server connections in mega data centers like Amazon, Facebook, and Google. In the next 5 years, 25G will be the next mainstream server upgrade from 10G, even for smaller data centers. SMB data centers will be facing a connectivity crisis in the future as the pace of virtualization increases.

According to IDC, the typical virtualized server supported about 10 virtual machines (VMs) in 2014 and will support in excess of 12 VMs by 2017. In many organizations, the majority of production workloads are already virtualized and almost all new workloads are deployed on virtualized infrastructure, placing inexorable stress on server connectivity.
In order to accommodate this growth Twinax copper and short-reach MMF are included in the “by” standard, while 25GBASE-T (twisted pair) was added to the existing 40GBASE-T “bq” project making 25G possible in smaller data centers without having to re-wire the data center.
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Ralph Bach has been in IT long enough to know better and has blogged from his Bach Seat about IT, careers, and anything else that catches his attention since 2005. You can follow him on LinkedIn, Facebook, and Twitter. Email the Bach Seat here.

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| April 16, 2015
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Wi-Fi Charges Up Ethernet

Wi-Fi Charges Up EthernetInformation Technology prognosticators Gartner (IT) predicts that 40% of enterprises will use Wi-Fi as the default connection for mobile and non-mobile devices by 2018 according to Fred Donovan at FierceMobileIT. The prediction says that typically fixed location devices like; desktops, desk phones, projectors, and conference rooms will use Wi-Fi as their primary connection replacing Ethernet.

Wi-FI logoGartner says Wi-Fi is facilitating BYOD. The enterprise Wi-Fi network now allows workers to choose any device and move anywhere in the workplace. Gartner argues that the introduction of security measures like 802.1X augmented with Advanced Encryption Standard (AES) encryption has lessened IT’s worry about security breaches involving the Wi-Fi infrastructure. Ken Dulaney, V.P. and distinguished analyst at Gartner said;

Ethernet cabling has been the mainstay of business workspace connectivity since the beginning of networking. However, as smartphones, laptops, tablets, and other consumer devices have multiplied, the consumer space has largely converted to a wireless-first world

Facilitating BYOD

As the first connection to the enterprise infrastructure, Wi-Fi brings workers the ability to choose any device and move anywhere without worry. VP Dulaney continued;

WI-FI certifiedAs bring your own device (BYOD) has increased in many organizations, the collision of the business and consumer worlds has changed workers’ demands

Furthermore, cabling systems or even peer-to-peer (P2P) wireless solutions using technologies that offer cable replacement have had to deal with a variety of connectors challenges, such as USB and micro-USB, as video systems move beyond Video Graphics Array (VGA). The market research firm also argues that MACD costs will decrease.

MACD costsAdditions, moves, and changes are costly inconveniences that waste time for enterprise IT organizations. A move can sometimes involve cabling changes that can cost as much as $1,000 … With Wi-Fi printers, desktops, and other devices, all that is required is a cable to the power source, leaving workers free to move themselves making reconfigurations of offices easier.

Because of the many benefits of Wi-FI, Gartner VP Dulaney predicts firms are going to change how they connect;

we expect many organizations to shift to a wireless-by-default and a wired-by-exception model.

New Ethernet specifications

In order to deal with the new wireless-by-default reality, changes are needed on the wired network.  at FierceCIO reports that the vendor community is working to address the Wi-Fi first world. Unfortunately, there are two industry groups pushing their own new Ethernet specifications. Mr. Mah says that new Ethernet standards are needed to work with Wave 2 of 802.11ac wireless access points (AP) with a theoretical maximum throughput of up to 3.5Gbps.

NCaptain Ethernetew standards are needed because the existing Gigabit Ethernet is a bottleneck and current alternatives are not attractive. First, link-aggregating two Gigabit Ethernet connections for each Wi-Fi AP would need additional cabling and more expensive managed switches to support it. Using 10GbE would be overkill. Upgrading to 10GbE is a significant investment that includes new Category 6a or Category 7 cables, more power, and more cabling.

One faction, the MGBase-T Alliance, was formed in June 2014 and includes; Avaya, Aruba Networks (ARUN), and Brocade (BRCD) as well as component vendors Broadcom (BRCM) and Freescale Semiconductor. The other group known as the NBase-T Alliance was formed in October 2014. This faction consists of Cisco (CSCO), Intel, Xilinx (XLNX), Freescale, and Aquantia, a company that’s already making 2.5G/5G components.

Little agreement on standards

At the moment, the only agreement between the two factions is that 2.5Gbps and 5Gbps speeds are needed. The IEEE 802 LAN/MAN Standards Committee has set up the P802.3bz 2.5/5GBase-T Task Force to address this issue. The 2015 Q1 CommScope Standards Advisor reports that the 802.3bz Ethernet cablescommittee has decided so far that:

  • 2.5 GBase-T option will run on Cat 5e (Class D) 4 pair UTP up to 100M, and
  • 5 GBase-T option will run on Cat 6 (Class E) 4 pair UTP up to 100M.
  • There is no release date yet

The concern, however, is that vendors could jump the gun by shipping pre-standard products ahead of standards rectification, complicating matters and slowing down the development of the pertinent standards.

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Remember 802.11n? Pre-standard products? Given that there is no guarantee that systems built with components from the two groups will work together. Don’t jump the gun – waiting for the standard to solidify before buying into new 2.5G/5G Ethernet networking hardware.

For now, Dell’Oro Group analyst Alan Weckel told FierceCIO is that enterprises will probably be able to buy 2.5G/5G equipment starting in Q2 of 2015. 

 

Ralph Bach has been in IT long enough to know better and has blogged from his Bach Seat about IT, careers, and anything else that catches his attention since 2005. You can follow him on LinkedIn, Facebook, and Twitter. Email the Bach Seat here.

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| April 30, 2013
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400 Gbps Ethernet Coming

400 Gbps Ethernet ComingThe Institute of Electrical and Electronics Engineers (IEEE), launched an IEEE 802.3 “Standard for Ethernet” study group to explore the development of a 400 Gbps Ethernet standard. The new standard will look to efficiently support an ever-increasing, exponential network bandwidth growth. Ethernet which is celebrating its 40th anniversary this year is defined by the IEEE 802.3 standard. Ethernet is a pervasive standard, driven by the ever-growing needs of the local area, access, and metropolitan area networks around the world.

Expanded reliance on Ethernet

IEEE logoBeyond traditional networks, Help Net Security reports that new application like industrial and automotive networking are expanding their reliance on Ethernet. To better address the needs of these areas, the IEEE 802.3 Ethernet standard is constantly evolving and expanding. John D’Ambrosia is the chief Ethernet evangelist, CTO office, Dell, and chair of the new IEEE 802.3 400 Gbps Ethernet Study Group. He says Ethernet must evolve. “Traffic is growing everywhere … and it’s critical that we move now to create a plan for the Ethernet ecosystem to evolve beyond today’s capabilities, in order to accommodate the burgeoning bandwidth tsunami.”

In August 2012, IEEE forecasted that networks will need to support 58% compound annual growth rates (CAGRs) on average. The growth will be griven by simultaneous increases in users, access methodologies, access rates, and services (such as video on demand and social media). IEEE report that networks would need to support capacity requirements of 1 terabit per second (Tbps) in 2015. That number grows to 10 Tbps by 2020 if current trends continue. Alan Weckel, vice president of enterprise and data center market research at Dell’Oro Group said in the article, “Ethernet is an arena of constant innovation, driven by the market demand for support of new ever-increasing bandwidth speeds, as well as new protocols, applications, and media types.”

Standards-based networking

EthernetStandards-based networking has worked so far and will be needed as 400 Gbps Ethernet evolves. Mr. Weckel adds, “Global bandwidth requirements are continuing to grow exponentially … Standards-based solutions are integral to maintaining business growth across the Ethernet ecosystem.”

David Law, chair of the IEEE 802.3 Ethernet Working Group and distinguished engineer with HP Networking explains in the article, “An IEEE 802.3 study group is formed when there is interest in developing a request to initiate an IEEE 802.3 Ethernet standards-development project.”

IEEE 802.3Dell’s D’Ambrosia told Wireless Design Magazine that a host of new technologies and applications have proliferated in the marketplace since the most recent speed jump to 100 Gb/s Ethernet was ratified in 2010. He reminded NetworkWorld that “The iPhone didn’t exist when we started 100G.” Mr. D’Ambrosia concludes that the impact has been felt throughout the Ethernet ecosystem. Data centers, for example, where Ethernet is the primary interconnect technology, are at the center of the bandwidth storm. Pressure is intensifying from all directions:

  • Outside the data center, driven by increasing numbers of users armed with more devices capable of ever-increasing bandwidth consumption;
  • Within the data center, driven by more and faster storage and server technologies, and
  • Across data centers, driven by new applications, new databases, and new architectures.
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Ralph Bach has been in IT long enough to know better and has blogged from his Bach Seat about IT, careers, and anything else that catches his attention since 2005. You can follow him on LinkedIn, Facebook, and Twitter. Email the Bach Seat here.

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