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TRANSCRIPT
LEVITON.COM/CROSSTALK 1
IN THIS ISSUE
UPCOMING EVENTS
Practical Applications for Category 8
Is OM5 Fiber a good solution for data centers?
New European Cable Regulations take effect in July 2017
News You Can Use
Tech Tips
Ask The Experts
Standards Snapshot
JUNE 25 - 29Cisco LiveLas Vegas, NV
AUGUST 8 - 10AFCEA TechNet AugustaAugusta, GA
SEPTEMBER 24 - 28BICSI Fall ConferenceLas Vegas, NV
continued on pg. 2LEVITON POLLLeviton recently asked 100 data center customers
Yes, in a new build out 9%Yes, in an existing network 13%I have no plans, yet 37%I am researching options 41%
continued on pg. 4
Are you planning to deploy 40 or 100G?
PracticalApplications
for Category 8Category 8 cabling solutions have arrived with the ability to support new 25/40GBASE-T networks. It’s impressive that the same tried-and-true twisted pair cabling and RJ-45 interface that delivered 10 megabits per second 15 years ago still play an important role in next generation networks.
But what are the practical applications for Cat 8? Where will it be deployed? First of all, these cabling systems make sense for applications requiring speeds greater than 10 Gb/s. This goes beyond the capabilities of Cat 6A, which has the performance specifications and flexibility to handle 10 Gb/s or slower speeds.
Also, for now, Cat 8 cabling systems will be limited to the access layer in data center networks. Due to its distance limitations of 30 meters or less in a two-connector channel — per IEEE, ISO, and TIA standards — Cat 8 cabling really isn’t applicable for enterprise or premise networks. However, for data center managers, Cat 8 offers some huge benefits. When planning for networks greater than 10 Gb/s in the access layer, the decision of which cable type to use largely depends on the network topology you prefer: Top-of-Rack (ToR), End-of-Row (EoR), or Middle-of-Row (MoR). Cat 8 will be able to support all of these topologies.
For data center managers, Cat 8 offers some huge benefits.
Wideband multimode fiber (WBMMF) is a new fiber medium specified in ANSI/TIA-492AAAE, published in June 2016. The ISO/IEC standards committee recently voted to use OM5 as the designation for WBMMF to be listed in the upcoming ISO/IEC 11801, 3rd edition. OM5 fiber specifies a wider range of wavelengths between 850 nm and 950 nm. It was specifically created to support Shortwave Wavelength Division Multiplexing (SWDM), which is one of the many new technologies being developed for transmitting 40 Gb/s, 100 Gb/s and beyond. OM5 is being presented as a potential new option for data centers that require greater link distances and higher speeds. However, many enterprise IT and data center managers are increasingly adopting single-mode fiber systems to solve these challenges. There are four reasons a data center might consider installing OM5.
Is OM5 Fiber a good solution for data centers?
OM3 7%OM4 30%OM5 6%OS2 57%
What Fiber type would you be installing today to plan for future growth?
Your Source for Industry News & Insight
CrossTalk NEWSLETTERVol. 8 | May/June 2017
LEVITON.COM/CROSSTALK 2
Practical Applications for CAT 8 • continued from pg. 1
continued on pg. 3
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Cat 8 CopperPatch Cords
Fiber Links
ToR MoR EoR
TopologyCabling for Top-of-Rack
If you prefer a ToR topology, you now have a choice between Direct Attach Copper (DAC) or Cat 8 for copper infrastructure. The ToR model uses a simplified cabling scheme — short intra-rack cable runs with a small number of uplinks to the aggregate switches.
Quad small form-factor pluggable (QSFP+) DAC passive assemblies were standardized in 2010 through IEEE 802.3ba. They are low-power solutions and have a similar form-factor to SFP+ 10 Gb/s (and future 25 Gb/s) assemblies. However, they have a limited distance of up to seven meters. With such limited reach, they are a better fit for ToR topologies instead of longer distances used in other topologies. QSFP+ DAC assemblies are also not backwards compatible, and can be used for 40 Gb/s networks only.
Unlike DAC assemblies, Cat 8 cabling leverages the benefits of auto-negotiation. Auto-negotiation allows for two Ethernet devices to connect to each other and select a common transmission speed that both devices support. Auto-negotiation requirements are laid out in IEEE 802.3 BASE-T standards. For example, 25 Gb/s ToR switches can communicate with 10Gb/s servers, whether over Cat 8 or Cat 6A connectivity.
This also allows for network migration to 25/40GBASE-T to be done in phases, allowing for more flexibility in terms of timing, disruption, and cost. With staggered active gear upgrades, BASE-T solutions can allow for mixed server speeds in each rack or cabinet supporting any combination of 1, 2.5, 5, or 10, 25, or 40 Gb/s servers, creating better port utilization of the switches.
Cabling for End-of-Row and Middle-of-Row
EoR and MoR designs have every server cabled back to a single switch dedicated to a row of server racks. The upside of this structured cabling approach is a simplified management environment with just one switch to manage per row.
These topologies require longer links than those for ToR designs, and for 25 and 40 Gb/s networks in EoR and MoR topologies, your two options are to use Cat 8 or multimode fiber. The longer cabling requirements eliminate short-length DAC assemblies as an option.
Multimode fiber offers the benefit of working over longer distances and low power, and it can provide a smaller cable profile. However, the high costs of fiber active equipment makes it an option that not all end users can justify.
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Cat 8 CopperPatch Cords
Fiber Links
Cat 8 CopperPatch Cords
FiberPatchCords
Cat 8 Copper Trunks
ToR MoR EoR
Topology
LEVITON.COM/CROSSTALK 3
If you have more questions about Cat 8, Leviton data center designers and engineers have extensive experience with the most popular network topologies, active equipment, and transmission methods. Many of them are active members on standards bodies that define future data center networks. You can reach them at 1-800-824-3005 or 1-425-486-2222.
Leviton Leads with Atlas-X1™
Atlas-X1 Cat 8 connectivity uses the same form factor and termination methods as other Atlas-X1 connectors. In fact, Atlas-X1 is the industry's first system to support shielded applications from Cat 8 to 5e and UTP applications from Cat 6A to 5e, all from one unified connectivity platform.
This comprehensive system is made in the United States, and delivers the highest level of verified performance across all categories to seamlessly support network migration up to 40GBASE-T. It was the first Cat 8 system to be independently tested and verified to meet TIA Cat 8 channel standards.
Category 8 can support the longer distances required in EoR and MoR designs, but it is limited to 30 meters or less. However, according to IEEE, links of 30 meters or less make up 80 percent of data center connections in the industry. If you require longer distances, fiber is the only option. Cat 8 also offers the benefit of operating over low power: it will not likely require any greater power or cooling requirements than a typical 10GBASE-T system used today.
Even if Cat 8 is not part of your immediate data center strategy, you may want to anticipate future tech refreshes in your current network infrastructure design. This means considering cable distances, connection counts, shielding, and more. Preparing for Cat 8 now will create a simple and cost effective migration in the future.
Cat 8 is limited to 30 meters or less. However, according to IEEE, links of 30 meters or less make up 80 percent of data center connections in the industry.
Practical Applications for CAT 8 • continued from pg. 2
LEARN MORE ABOUT CAT 8 AND LEVITON’S ATLAS-X1 SYSTEM AT LEVITON.COM/CAT8.
New European Cable Regulations Take Effect In July 2017CPR created to save lives and protect buildings.
The Construction Products Regulation (CPR) is a popular topic of conversation in the industry across Europe right now, as new rules take effect starting July 1, 2017. For communication cables, it specifically introduces new fire safety classifications and requires that all cables marketing in the European Economic Area (EEA) carry a CE mark and have a declaration of performance (DOP) verifying appropriate compliance.
We’re committed to meeting regional CPR requirements. Brand-Rex, a Leviton company that serves as Leviton’s European headquarters, has invested several years getting ready for CPR, working closely with standards committees to prepare for this important change in the market. In addition to our CE-marked Euroclass Eca fiber and copper cable introduced in August 2016, we continue to expand our portfolio to include higher classification cables.
Have questions? Visit our CPR web page for more information.
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LEVITON.COM/CROSSTALK 4
Is OM5 Fiber a good solution for data centers? • continued from pg. 1
So, what are the reasons a data center might consider installing OM5?
OM5 offers a longer cabling reach than OM4.
> The difference is minimal.
For all the current and future multimode IEEE applications including 40GBASE-SR4, 100GBASE-SR4, 200GBASE-SR4, 400GBASE-SR16, the maximum allowable reach is the same for OM5 as OM4 cabling. Based on application testing recently done with 40G-SWDM4 transceivers, it has been proven that OM4 could support about 400-meter reach and OM5 a 500-meter reach. If a data center is using non-IEEE compliant 100G-SWDM4 transceivers, they would see a 150-meter reach with OM5 — only 50 meters more than OM4. For most cloud data centers, if they have cabling runs over 100 meters, they will very likely use single-mode for 100 Gb/s and greater speeds.
OM5 will reduces costs.
> It won’t.
OM5 cabling is about 50% more than OM4 cabling. In addition, if you look at the cost of a full 40 Gb/s channel, including SWDM transceivers, the cost per channel is still 40% more than a 40GBidi/OM4 channel. The costs of single-mode transceivers have declined considerably over the past 12-18 months due to silicon photonics technologies and large hyperscale data centers buying in very large volumes. When comparing the price of 100 Gb/s transceivers, 100G-PSM4 using single-mode fiber is the same price as 100GBASE-SR4 using multimode fiber.
OM5 is required for higher speeds.
> Not true.
All of the IEEE standards in development for 100/200/400 Gb/s will work with either single-mode (OS2) or multimode (OM4). The majority of these next-generation speeds will require single-mode. IEEE always strives to develop future standards that work with the primary installed base of cabling infrastructure so customers can easily migrate to new speeds. In addition, none of the these currently active IEEE standards addressing next-gen speeds (802.3bs or 802.3cd) will use SWDM technology.
OM5 will create higher density from switch ports.
> It won’t.
It has been very common for data centers using 40GBASE-SR4 to increase port density by breaking out 40 Gb/s ports into 10 Gb/s channels. This is also a benefit of new 100GBASE-SR4 modules, which use OM4 cabling. If a data center manager decides to use 100G-SWDM4 modules with OM5 cabling, they cannot break out into 25 Gb/s channels. This would become a real issue as the 25 Gb/s ecosystem fully develops and we begin to see more 25 Gb/s to the server.
Leviton does not see any good reason to currently recommend OM5 to large data center operators. For enterprise data centers looking at migrating to 40GBASE-SR4 or 100GBASE-SR4, OM5 offers no additional benefit over OM4 or OM4+. And larger cloud data centers are either already using single-mode or planning to move to single-mode in the near future for migration to 800 Gb/s and 1 Tb/s without changing out their cabling. You can learn more about Leviton's multimode and single-mode solutions at Leviton.com/fiber.
ASK THE EXPERTSQ: Do you need more than 30 watt PoE for wireless access points?
A: Yes. Most wireless access points (WAPs) today require more than 30-watt PoE due to more signal processing and antenna configuration. In fact, some of the newer devices will require 60-watt PoE or higher.
Email: [email protected]
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© 2017 Leviton Manufacturing Co., Inc. 5
YESTERDAY’S NEWS1965: Intel co-founder Gordon Moore publishes a theory in Electronics magazine that comes to be known as “Moore’s Law.” The projection stated that the transistor density on integrated circuits will double every year. It was adjusted to 18 months in 1975 and held closely to that rate until 2012.
INDUSTRYVendors will ship 5 million 100 GbE Ethernet ports this year, and double that amount in 2018, according to Arista chairman Andreas Bechtolshiem. He is also forecasting 400 GbE shipments will reach 1 million units in 2019, and 4 million in 2020.
10GBASE-T data center switch shipments increased more than 60% in 2016, according to Crehan Research Inc.
Ensuring Shielded Category Cabling System Integrity
5
The general best practices below highlight the grounding and bonding elements within a single telecommunications room. For more information, you can download our expanded list of grounding best practices (pdf). Refer to the TIA-607-C standard for additional elements required for a larger Telecommunications Grounding System.
PRODUCTIn May, Leviton introduced a flat UHDX panel for customers who want ultra-high-density fiber patching with added accessibility and migration flexibility. The 1RU flat UHDX panel, part of the HDX platform, supports up to 144 LC fibers or 1,728 MTP fibers.
WEBDid you know Leviton offers online system designers to help you configure the cabling network you need, and then generate a customized bill of materials?
Check out these three helpful configurators:
• Structured Media Configurator Select network connectivity for a residence, including data, phone, cable, and power audio, and more.
• IT/AV System Designer Designing an AV system for a classroom, conference room, or meeting space.
• Small Business Network Design Tool Specify up to four different workstation outlet configurations.
COMPANYIn May, Leviton acquired Birchwood Lighting, a manufacturer of high-
quality light fixtures in southern California. Birchwood Lighting will be the latest addition to Leviton’s newly consolidated Leviton Lighting business unit.
• Follow standards-compliant methodology to install and verify an effective telecommunications grounding system
• Follow the manufacturer’s instructions to properly install shielded connectors, cables, patch cords, and patch panels
• Finally, install individual #6 AWG Unit Bonding Conductors (UBC) between each Shielded Patch Panel and the Rack or Cabinet bonding element. While #12 AWG UBCs are the minimum called out by ground and bonding standards, #6 AWG is the industry best practice.
See all of Leviton’s recommendations for ensuring shield integrity to ground our shielded solutions with this application note (pdf).
An angled UHDX panel is already available, along with UHDX 1RU, 2RU, and 4RU enclosures. Learn more at Leviton.com/HDX.
TR
TBBTEBC
SBB
(telecommunications bonding backbone) (telecommunications equipment
bonding conductor)
(secondary bonding bussbar)
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