Cim 20100501 may_2010

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Cim 20100501 may_2010

  1. 1. Contents Zoom In Zoom Out For navigation instructions please click here Search Issue Next Page SOLUTIONS FOR PREMISES AND CAMPUS MAY 2010 COMMUNICATION SYSTEMS WORLDWIDE DON’T MIX YOUR multimode PAGE 19 DATA CENTER PAGE 7 The revision of TIA-942 INSTALLATION PAGE 13 Fundamentals of fiber transmission EDITOR’S PICKS PAGE 29 iPad’s WiFi woes w w w.c ablingins t all.c o m Contents Zoom In Zoom Out For navigation instructions please click here Search Issue Next Page
  2. 2. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F Why Settlefor Less ? While other manufacturers want extra for birdie performance in a cable, here at Corning Cable Systems, we thought we’d just make that par for the course. All LANscape® Solutions 50 micron multimode cables contain ClearCurve® Multimode Fiber. That’s bend-insensitive multimode – so no matter what your network faces, you’ve got signal integrity in the bag. Learn more at _______________________ offers.corning.com/1-CIM-CC © 2010 Corning Cable Systems LLC C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  3. 3. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F It’s not just a cabinet. It’s a cost savings investment. COOLING COSTs:_________$1,079,232 With CPI passive cooling:________$497,525 savings:________$539,616 50% A yearly savings of $539,616 in energy costs is a real world example using CPI Passive Cooling® Solutions in a recent data center build with 160 CPI cabinets and 3,400 square feet of floor space. CPI Passive Cooling Solutions also allow you to: • Deploy the latest servers, switches and blade A typical data center deploying standard cabinets servers from HP IBM, Dell, Cisco, Juniper and , may require more than twice the number of Brocade cabinets, floor space and cooling capacity to deliver your compute, switching and data storage • More effectively leverage heat exchange and as compared to a data center incorporating CPI economizer technologies to potentially realize Passive Cooling Solutions. up to 90% reduction in data center cooling costs and 40% on total data center energy costs Utilizing airflow management strategies to isolate • Increase equipment density by 50% or more hot and cold air, CPI Passive Cooling Solutions • Design for future growth without pre-install- provide the most cost effective and efficient tion of unneeded power and cooling equipment thermal solutions on the market.Your investment in CPI technology provides both a near-term payback and long-term capacity to grow. How much can you save? Optimize. Find out with the new CPI PUE CalculatorTM at www.chatsworth.com/pue-calculator. Store. Secure. www.chatsworth.com or techsupport@chatsworth.com 800-834-4969 C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  4. 4. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F a new world of unrivaled integrated solutions OCC is recognized as the gold standard in an industry that demands speed, technology, and durability. Our expanded product offering includes fiber optic and copper cabling, as well as connectivity components designed for commercial, specialty, and harsh-environment applications. We have broadened our scope, creating a single source of integrated solutions for our customers. 800-622-7711 | Canada 800-443-5262 To learn more, visit occfiber.com or call for a free catalog. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  5. 5. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F MAY 2010 | VOLUME 18 NO. 5 ABOUT THE COVER Switching from 62.5- to 50-μm multi- :: FEATURES mode fi ber can boost your bandwidth. DATA CENTER But if you mix the two together, you won’t like the results. TO LEARN MORE, SEE ARTICLE ON PAGES 19. 7 What will be in the revised version of the TIA-942 Data Center standard? JONATHAN JEW, J&M CONSULTANTS Group Publisher Susan Smith (603) 891-9447; susans@pennwell.com Chief Editor Patrick McLaughlin INSTALLATION (603) 891-9222; patrick@pennwell.com Senior Editor Matt Vincent (603) 891-9262; mattv@pennwell.com 13 The fundamentals of optical light sources and transmission Marketing Manager Joni Montemagno Art Director Kelli Mylchreest VALERIE MAGUIRE, SIEMON Production Manager Mari Rodriguez Senior Illustrator Dan Rodd Development Manager Michelle Blake DESIGN Ad Traffic Manager Alison Boyer 19 Making the switch from 62.5- to 50-micron fiber EDITORIAL OFFICES JOHN KAMINO, OFS PennWell Corporation, Cabling Installation & Maintenance 98 Spit Brook Road LL-1 Nashua, NH 03062-5737 TECHNOLOGY Tel: (603) 891-0123, fax: (603) 891-9245 www.cablinginstall.com CORPORATE OFFICERS 23 Digital signage presents ambiguity and opportunity Chairman Frank T. Lauinger President and CEO Robert F. Biolchini PATRICK MCLAUGHLIN Chief Financial Officer Mark C. Wilmoth TECHNOLOGY GROUP IP CONVERGENCE Senior Vice President & Publishing Director Christine A. Shaw Senior Vice President, Audience Development 27 Global and granular looks at the audiovisual market Gloria Adams For subscription inquiries: PATRICK MCLAUGHLIN Tel: (847) 559-7520; Fax: (847) 291-4816 e-mail: cim@omeda.com; web:www.cim-subscribe.com :: DEPARTMENTS CABLING INSTALLATION & MAINTENANCE © 2010 (ISSN 1073-3108), is published 12 times a year, Aprilly, by PennWell Corporation, 1421 South Sheridan Road, Tulsa, OK 74112; phone (918) 835-3161; fax (918) 831-9497; www.pennwell. _ Periodicals postage paid at Tulsa, OK 74112 and other additional com. offices. Subscription rate in the USA: 1 yr. $88, 2 yr. $119, BG $161; Canada/ Mexico: 1 yr. $98, 2 yr. $132, BG $178; International via air: 1 yr. $120, 2 yr. $160, 4 Editorial BG $216; Digital: 1 yr. $60. If available, back issues can be purchased for $22 in the U.S. and $32 elsewhere. All rights reserved. No material may be reprinted. Bulk What’s your backup plan? reprints can be ordered from The YGS Group (cim@theygsgroup.com). We make portions of our subscriber list available to carefully screened companies 29 that offer products and services that may be important for your work. If you do not want to receive those offers and/or information via direct mail, please let us know by contacting us at List Services Cabling Installation & Maintenance, 98 Spit Brook Editor’s Picks Road LL-1, Nashua, NH 03062. POSTMASTER: Send address changes to: Cabling Installation & Maintenance, P.O. Box 3425, Northbrook, IL 60065-3280. Return undeliverable Canadian WiFi woes causing trouble for iPad users addresses to: P.O. Box 122, Niagara Falls, ON, Canada L2E 6S4. PRINTED IN THE USA. GST No. 126813153 Publications Mail Agreement no. 1421727 www.cablinginstall.com Cabling Installation & Maintenance MAY 2010 3 C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  6. 6. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F :: EDITORIAL :: on cablinginstall.com What’s your backup plan? Several years ago when Cabling but many users could not access the Installation & Maintenance began to site for more than an hour. The blog DESIGN/INSTALL/TEST sharply focus on the cabling and other made no mention of what efforts the New premises-cabling textbook published systems within data centers, it did not organization makes to control the heat take long before I noticed an overarch- in its European data center. But some- NETWORK CABLE ing theme to just about thing tells me a man by the name of Phthalate-free plasticizers every conversation I had Ian Seaton would have a field day in enable eco-friendly cables on the topic. It didn’t that data center. (What? You don’t matter what we began know who Ian Seaton is? Go to our DATA CENTER talking about—for exam- Web site, www.cablinginstall.com, New blade-based optical ple, overhead versus and search his name.) interconnect system underfloor cable rout- The biggest snafu in the Wikipedia ing, the copper/fi ber mix situation was that the site’s backup CABLING STANDARDS in data center networks, plan did not work successfully. It TIA-942 revision managing huge bundles of cables at sounds as if things got resolved pretty likely to recommend certain connectors the rack—the conversation always quickly, and no one was inconve- ended up coming around to managing nienced for a terribly long time, but CONNECTIVITY the facility’s heat and keeping critical the overheated data center would have TECHNOLOGIES equipment cool. The theme made its been seamless to users if the backup High-density fiber system way into virtually every conversation. systems had worked as they were a fit for data centers Recently the theme of an over- expected to. It begs the question: What heated data center was much-dis- is your backup plan? And how sure are WIRELESS cussed at the offices of Wikipedia, to you that it will work when called upon? Wireless LANs and be certain. In late March, an overheat- It doesn’t matter if you’re a data center distributed antenna systems ing problem at the online encyclope- manager, network administrator, or the IP CONVERGENCE dia’s European data center caused operator of a contracting organization. a temporary global shutdown of the Someday, sometime, the systems you Integration allows IP video over wireless site. The Wikimedia Technical Blog rely upon for business operation will explained that servers in the European fail. Do you know what you’ll do when NETWORK PROTOCOLS data center shut themselves down that happens? IEEE moves on serial 40G in order to avoid damage from over- If you don’t, 90 minutes without heating. Once that happened, the site Wikipedia will be a best-case scenario. Visit cablinginstall.com for moved all user traffic to its Florida data Think: Travelers stranded in Europe these and other news stories. center; however it then was discovered and at the mercy of Eyjafjallajokull. the failover mechanism in the Florida location that changed Domain Name PATRICK McLAUGHLIN System entries, was broken. Chief Editor The problem was resolved quickly, patrick@pennwell.com 4 MAY 2010 Cabling Installation & Maintenance www.cablinginstall.com C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  7. 7. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F Which of these is a bigger threat to your security investment? Products. Technology. Services. Delivered Globally. The wrong cabling The right cabling infrastructure can infrastructure is hinder the performance critical to the of even the most Blurred, unusable video successful operation Crystal clear video sophisticated video over minimally compliant and useful life of a over ipAssured IP-ClassSM Category 5e cable 10+ cable surveillance system. security system. Factors that affect the performance of cabling infrastructure: Anixter ipAssuredSM is an infrastructure assurance program that matches • The migration of a security • The need for Power over Ethernet the cabling infrastructure to the security equipment based on the technical, system to IP Plus and beyond application and life-cycle requirements of the user. • Minimally compliant • Installation practices Receive the best performance for the anticipated life of your security system Category 5e cable • Environmental conditions by installing an ipAssured cabling infrastructure. • Increasing bandwidth requirements • Quality of IP cable manufacturing PANDUIT offers a full line of innovative products that meet the most demanding industry requirements for data and telecommunication applications. Backed by 10-year product and 25-year performance warranties, these systems are designed to support emerging technologies, including Voice over IP (VoIP) and Gigabit Ethernet, and exceed the latest industry standards to provide assurance of network reliability. Contact your local Anixter representative or visit anixter.com/ipassured10 to learn how Anixter ipAssured can protect your security investment. 1.800.ANIXTER anixter.com © 2010 Anixter Inc. Anixter is a leading global supplier of communications and security products, electrical and electronic wire and cable, fasteners and other small components. We help our customers specify solutions and make informed purchasing decisions around technology, applications and relevant standards. Throughout the world, we provide innovative supply chain management services to reduce our customers’ total cost of production and implementation. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  8. 8. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F ____________________ C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  9. 9. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F :: DATA CENTER :: What will be in the revised version of the TIA-942 Data Center standard? Some of the changes that will be made in TIA-942-A to incorporate Five years after initial publication, revisions are it into the new scheme include the underway for the TIA’s data center cabling specification. following. • Reference the generic telecommu- JONATHAN JEW, J&M CONSULTANTS nications cabling topology, terms, and environmental classifications ANSI/TIA-942, one of the This scheme is meant to improve ease described in TIA-568-C.0. Telecommunications Industry of use, efficiency, and ensure consis- • Move content regarding bond- Association’s (TIA; www.tiaonline. tency between standards. ing and grounding into the draft org) __ best-selling standards, is under- going revision. All American National TIA premises telecommunications cabling standard scheme Standards Institute (ANSI; www.ansi. Common standards Premises standards Component standards org) standards must be reaffi rmed, __ ANSI/TIA-568-0 Generic ANSI/TIA-942-A ANSI/TIA-568-C.2 withdrawn, or revised every five years. telecommunications Telecommunications Balanced twisted-pair cabling for customer infrastructure standard telecommunications Since ANSI/TIA-942 was published premises for data centers cabling and in 2005, it was readily apparent that it ANSI/TIA-569-C ANSI/TIA-568-C.1 components standard needed to be revised. The revision to Standard for Commercial building telecommunications telecommunications ANSI/TIA-568-C.3 TIA-942 will be named TIA-942-A. pathways and spaces cabling standard Optical fiber cabling ANSI/TIA-606-A components standard ANSI/TIA-570-B Administration standard Residential New TIA cabling standards scheme for commercial telecommunications telecommunications Because TIA-942 was published infrastructure infrastructure standard after the restructuring of the TIA-568 ANSI/TIA-607-B ANSI/TIA-1005 Telecommunications Telecommunications series cabling standards, TIA-942 infrastructure standard grounding and bonding needed to be modified to fit into the for customer premises for industrial premises new TIA premises telecommunica- ANSI/TIA-758-B ANSI/TIA-1179 Customer-owned outside Healthcare facility tions cabling standards scheme. In plant telecommunications telecommunications infrastructure standard infrastructure standard this new scheme, common informa- tion that applies to multiple types of ANSI/TIA-862-A Building automation systems Note red text indicates standards that are not yet premises is in common standards, and cabling standard published but that are active projects information specific to a particular type of premises is in premises stan- ANSI/TIA-942-A will be a Premises Standard (middle column) in dards such as TIA-942. Component TIA’s new standard scheme. That means information that applies standards deal with the specification to multiple types of premises including data centers will be found of components and are intended pri- in Common Standards (left column), while information specific to marily for component manufacturers. data centers will be found in 942-A. www.cablinginstall.com Cabling Installation & Maintenance MAY 2010 7 C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  10. 10. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F :: DATA CENTER :: Draft TIA-942-A example data center topology TIA-607-B standard, which provides Access provider or campus cabling much more information regard- Backbone cabling Entrance ing telecommunications ground- Horizontal room Horizontal cabling ENI cabling for spaces ing and bonding. Because bond- outside computer room Cross-connect ing and grounding are important Inter-connect MDA TR for all premises, it is appropriate for Outlet this content to be in a generic rather Telecom MC HC than a premises standard. space • Remove content regarding labeling in computer rooms and instead refer New space intermediate IDA IDA to TIA-606-A Addendum 1, which distribution area (IDA) containing an IC IC was published in late 2008 and intermediate cross-connect (IC) deals specifically with computer HDA HDA HDA HDA room and equipment room adminis- HC HC HC HC tration. Eventually, TIA-606-A will be superseded by TIA-606-B, which ZDA ZDA will incorporate the addendum and extend the concepts in TIA-606-A EO EO EO CP CP EO EO EO to administration outside computer EDA EDA EDA EDA EDA EDA rooms and equipment rooms. • Move content regarding racks EO EO EO EO Computer Computer and cabinets to the draft TIA- room 1 EDA EDA EDA EDA room 2 569-C standard (because cabinets CP - Consolidation point HC - Horizontal cross-connect MC - Main cross-connect and racks are used in all types of EDA - Equipment HDA - Horizontal distribution area MDA -Main distribution area distribution area IC - Intermediate cross-connect TR - Telecommunications premises). ENI - External network interface IDA - Intermediate room EO - Equipment outlet distribution area ZDA - Zone distribution area • Replace power and telecommu- nications cabling separation dis- In an early draft, TIA-942-A includes the addition of the tances with a reference to the intermediate distribution area (IDA) and intermediate crossconnect more-detailed information being (IC) to serve the needs of larger data centers. developed for TIA-569-C. • Move content regarding outside cabling from the main distribution area accomplished the following. plant pathways to the draft TIA- (MDA) for coaxial cable used for these • Specified a wider range of temper- 758-B outside plant standard. circuits, and provides revised circuit atures and humidity in data cen- distance guidelines for T-1, T-3, E-1, ters based on revised guidelines Incorporating TIA-942 addenda and E-3 circuits in data centers using published in 2008 by the American TIA-942-A will incorporate the con- the new component specifications. Society of Heating, Refrigeration tents of two addenda to TIA-942. TIA-942-2 Additional guide- and Air Conditioning Engineers TIA-942-1 Data center coaxial lines for data centers. Addendum (ASHRAE; www.ashrae.org). cabling specifications and appli- 2, which was approved in late 2009 • Specified a three-level lighting pro- cation distances. Addendum 1, pub- and should be available now, pro- tocol to reduce energy usage. lished in 2008, provides additional vides additional guidelines on a wide • Added Category 6A to supported specifications for coaxial cable con- variety of subjects, the most impor- media and specified it as the rec- nectors used for T-3, E-1, and E-3 cir- tant of which are revisions to improve ommended media for balanced cuits. It permits longer horizontal energy efficiency. The addendum twisted-pair cable. 8 MAY 2010 Cabling Installation & Maintenance www.cablinginstall.com C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  11. 11. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F OUR BEST IDEAS COME FROM YOU You asked for a cable that has substantiated green properties, and we responded. General Cable now offers halogen-free Brand UL-Rated Riser (CMR) cable options at a competitive price. By removing halogens, which are Group 17 on the Periodic Table, the cable has reduced toxicity. This results in a truly “green” cable which is less toxic and more environmentally friendly. lo n o h a g ens 17 FREE re du ty c e d t o x i ci (800) 424-5666 www.generalcable.com Share your ideas. We’re listening: Datacom@GeneralCable.com C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  12. 12. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F :: DATA CENTER :: • Added guidance to Balanced-pair zone distri- check with equipment ISO/IEC 24764 and CENELEC EN 50173-5 bution cabling is limited to example data center cabling topology a maximum of 100 meters, manufacturers regard- Distributor ENI ENI ing radio sources (wire- in accordance but optical-fi ber cabling with Network access less LANs, cellular tele- cabling subsystem lengths are only depen- ISO/IEC 11801 phones, handheld radios, MD dent on the channel-length etc.) in computer rooms Main distribution restrictions for the cabled cabling subsystem and entrance rooms. optical fi ber category used ZD ZD • Updated data center (i.e., 300 meters for OF-300 Tiering reference guide. Zone distribution channels, 500 meters for cabling subsystem LDP LDP LDP LDP OF-500 channels, and International standard 2,000 meters for OF-2,000 EO EO EO EO EO EO EO EO EO EO influence channels). Optional cables The recently approved ISO/ ENI - External network interface (cross-connect in telecom entrance room) TIA-942 has only two IEC 24764 international MD - Main distributor (equivalent to main cross-connect in TIA MDA) exceptions to the normal ZD - Zone distributor (equivalent to horizontal cross-connect in TIA HDA) data center telecommu- LDP - Local distribution point (equivalent to consolidation point in TIA ZDA) rule that horizontal cabling EO - Equipment outlet (equivalent to outlet in TIA EDA) nications cabling stan- is limited to 100 meters, as dard will likely influence follows. While harmonization between TIA and some of the changes that 1. Up to 300-meter hori- international standards is an ideal, one should not will be made in TIA-942-A zontal optical-fi ber cabling expect all the terminology used in the ISO/IEC because it is desirable to originating from the MDA 24764 and CENELEC EN 50173-5 standards to be harmonize with interna- in data centers where no included in TIA-942-A. tional standards. The ISO/ HDA is present. IEC standard may have 2. Up to 300 meters hori- an impact on several aspects of TIA- horizontal distribution area (HDA), the zontal 75-ohm coaxial cabling origi- 942-A, including terminology, max- ISO/IEC and CENELEC standards call nating from the MDA. imum horizontal cabling lengths, the zone distributor (ZD). Because ISO/ TIA-942-A will probably remove cabling types, and connectors. IEC 24764 does not deal with spaces, horizontal cabling distance restrictions Terminology. The ISO/IEC there is no equivalent in that standard for optical fi ber other than the appli- 24764 standard, published by the for spaces such as the MDA or HDA. cation-dependent restrictions speci- International Organization for It is unlikely that TIA-942 terms fied in TIA-568-C.0. Removing such Standardization (ISO; www.iso.org) will be changed to match the ISO/IEC restrictions will permit more flexibil- and the International Electrotechnical terminology. However, it is expected ity in designing optical-fi ber networks Commission (IEC; www.iec.ch), that terms for parts of the infrastruc- such as storage area networks. only deals with telecommunications ture not named in TIA-942 will be Cabling. ISO/IEC 24764 speci- cabling and is primarily based on the adopted in TIA-942-A. Examples are fies a minimum of Class EA (Category European data center cabling standard the equipment outlet (EO) and external 6A) for all balanced-pair except net- CENELEC EN 50173-5, which was network interface (ENI). work access cabling—cabling origi- published in 2007. Both the ISO/IEC Maximum horizontal cabling nating from the entrance room. TIA- and CENELEC (www.cenelec.eu) stan- lengths. The ISO/IEC and CENELEC 942 permits the use of Category 3 dards use terminology that is different data center standards permit various through 6A for both backbone and from that found in TIA-942. For exam- maximum cabling lengths for zone dis- horizontal cabling, but recommends ple, what TIA-942 calls the horizon- tribution cabling (horizontal cabling) Category 6A. TIA-942-A will probably tal crossconnect (HC) located in the based on the type of cabling employed. eliminate the use of one or more of the 10 MAY 2010 Cabling Installation & Maintenance www.cablinginstall.com C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  13. 13. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F :: DATA CENTER :: lower Categories of cables for balanced on energy-efficient design, including the room. For an example data center twisted-pair horizontal cabling. recommendations regarding the design using this setup, see the figure titled ISO/IEC 24764 specifies a minimum of telecommunications cabling, path- Draft TIA-942-A Example Data Center of OM3 (50/125-micron 850-nanometer ways, and spaces to improve energy Topology. laser-optimized multimode fi ber) for all efficiency. This content will be in addi- The potential changes described multimode optical fi ber in data centers. tion to the energy-saving measures in this article are being considered Connectors. Unlike TIA-942, provided in TIA-942 Addendum 2. by TIA TR-42.1, the subcommit- which specifies no particular connec- To handle large data center topolo- tee responsible for TIA-942-A. Please tors, ISO/IEC 24764 specifies the fol- gies, TIA-942-A will add a new space note, though, that many of them may lowing connectors. LC and MPO for named the intermediate distribution not make it into the fi nal publication. multimode fi ber at the EO and ENI; area (IDA), containing a new second- Also, there will be other modifications LC and MPO for singlemode fi ber EO; level backbone distributor named to TIA-942 that I have not described Angled LC connector for singlemode the intermediate crossconnect (IC). here. Because we are at the beginning fi ber at the ENI Practical experience has shown that stages of the revision, it is difficult to TIA will probably recommend but very large data centers may require tell what those modifications will be. not require the use of LC and MPO this second-level distributor. For exam- If all goes well, TIA-942-A could be connectors. ple, a large data center could include published sometime in 2011. several computer rooms, each of which Other new content could have one or more IDAs to act JONATHAN JEW is president of J&M TIA-942-A will include a new section as central points of administration for Consultants (www.j-and-m.com). Get the multimode fiber that turns on a dime. OFS’ LaserWave® FLEX multimode fiber minimizes bending loss at bend radii as low as 7.5 mm – that’s less than the radius of a dime! LaserWave FLEX Fiber is ideal for use in high-density data centers and enterprise LAN applications, promoting compact system design and better space utilization while simplifying jumper installation and routing. To learn more, ask your cabler about OFS or visit ofsoptics.com/fiber. www.cablinginstall.com Cabling Installation & Maintenance MAY 2010 11 C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  14. 14. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F The CAT 6A system that’s head of its class. Go with the industry’s first component-rated CAT 6A system. Leviton’s eXtreme® CAT 6A UTP System delivers superior performance for today’s high bandwidth applications. Our CAT 6A connectors, patch panels, and patch cords have each been independently verified to meet or exceed TIA 568-C.2 component performance. This ensures greater permanent link and channel margins to support 10GBASE-T networks up to 500 MHz. Best of all, Leviton offers a lifetime product and performance warranty on CAT 6A installations.* Now that’s smart. Learn more at Leviton.com/CAT6A *Qualifed Contractor CAT 6A installations only C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  15. 15. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F :: INSTALLATION :: The fundamentals of optical light sources and transmission • Smaller media (e.g. two Category 6A cables occupy the same space Bandwidth and throughput capacity are all about a as one 216-fi ber cable.) fiber’s ability to receive and transmit light paths. • Lighter media (e.g. 108 Category 6A cables weighing 1,000 pounds or 1 BY VALERIE MAGUIRE, SIEMON 216-fi ber cable weighing 40 pounds can be used to support 108 chan- It may be surprising to learn that the telecommunications infrastructures as nels that are 200 feet in length.) idea of using lightwaves to trans- well. Beyond supporting long-length • Significantly higher port density in mit voice signals is well over a cen- runs installed between buildings or the telecommunications room and tury old. In fact, Alexander Graham points in a customer-owned campus line-card density in the data center Bell’s “photophone” invention used environment (commonly referred to (up to 1,728 in a 4U housing) a narrow beam of sunlight focused as “outside plant” cabling), it is inter- • Smaller pathways on a thin mirror that vibrated when esting to note that on average, 20% of • Improved air flow due to less cable hit by human sound waves to trans- the cabling installed in the enterprise damming mit voice signals over distances up to and 40% of the cabling installed in • Media robustness; optical fi ber 700 feet back in 1880. The foundation the data center is optical for modern techniques of transmit- fi ber cabling. While bal- Light spectrum ting light energy was set in the 1960s anced twisted-pair cop- Increasing frequency when ruby lasers were fi rst demon- per cabling may still be Ultraviolet/400 nm strated, and in the 1970s when work- the media of choice due Violet/455 nm ers at Corning Glass Works produced to familiarity, perceived Blue/490 nm the fi rst optical fi ber with signal losses ease-of-termination com- Visible spectrum Green/550 nm less than 20 dB/km. Since then tre- pared to optical connec- mendous strides have been made in tions, and significant lower Yellow/580 nm Orange/626 nm the refi nement of semiconductor laser local area network (LAN) Red/750 nm and light-emitting diode sources, as equipment costs, the fol- Multimode, Infrared/800 nm short wavelength 850 nm well as the optical fi ber cables and lowing benefits are com- components used to support the pelling reasons to consider Multimode, single-mode, Fiber optic long wavelength 1300 nm application transmission of light energy. optical fi ber cabling in While optical fi ber cabling exper- your information technol- Single-mode, 1550 nm long wavelength tise is commonly thought to fall ogy (IT) infrastructure. within the domain of service provid- • Extended distance The common optical communications ers, it cannot be overlooked that opti- support beyond the wavelengths of 850 to 1550 nm fall between cal fi ber cabling plays an important balanced twisted-pair the ultraviolet and microwave frequencies in role in supporting customer-owned limit of 100 meters the light spectrum. www.cablinginstall.com Cabling Installation & Maintenance MAY 2010 13 C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  16. 16. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F :: INSTALLATION :: Multimode and singlemode light propagation can withstand double the pull ten- sion (50 lb versus 25 lb) of balanced Multimode – step index twisted-pair cabling Source • Reduced LAN equipment power Light rays consumption and cooling costs Multimode – • High-speed applications support; graded index 40- and 100-Gbit/sec optical-fi ber Ethernet applications will soon be published by the IEEE 802.3ba Singlemode – Ethernet Task Force step index • Centralized optical cabling may be used when deploying central- Step index multimode fibers (top) have a uniform refractive index, ized equipment in the horizontal meaning all energized light paths travel at the same speed whether to eliminate the need for an optical they’re propagating at the fiber’s core or edge. In graded index crossconnect multimode fibers (middle), the refractive index gradually changes • Immunity to electromagnetic and from a maximum at the center to a minimum near the edge, which radio frequency interference (EMI/ minimizes undesirable modal dispersion. Virtually all multimode RFI) fibers made today are graded-index. • Immunity to lightning strikes best match the transmission proper- fi ber (e.g. 9-μm) is required to ade- Signal transmission over ties of recognized optical fiber types. quately support transmission of laser optical fiber cabling A helpful analogy is to think of “wave- light sources. Optical communication is the trans- length” as the color of the light signal As a result of the variance in source mission of photon (or light) energy that is being transmitted. The common aperture and optical fi ber size, there through a low-loss waveguide whose optical communications wavelengths are two ways that light can propagate function is to propagate the light sig- of 850 nm to 1550 nm fall between the through optical fi ber. Because 62.5- nals over long distances. In telecom- ultraviolet and microwave frequencies and 50-μm optical fi ber diameters are munications systems, the source of in the light spectrum. relatively large compared to the wave- the photon energy may be a light- “Source aperture” describes the length of the transmitted light signal, emitting or semiconductor laser width of the transmitted light sig- there are many paths or “modes” that diode, whose function is to produce nal pulse. This characteristic is also light energy may take when it propa- light energy at a single wavelength. related to the diameter of the optical gates through the optical fi ber. This By turning the light source on and off fi ber (the “waveguide”) that will opti- type of transmission is referred to as quickly, streams of ones and zeros can mally transmit the light pulses, which multimode. Because the 9-μm optical be transmitted to form a digital com- helps to explain why there are several fi ber diameter is similar to the wave- munications channel. LED and laser types of optical fi ber cabling systems length of the transmitted light signal, light sources vary considerably with available. Large diameter optical fi ber only the one wavelength associated respect to their cost, transmit speed, (50- and 62.5-μm) is required to ade- with transmission propagates through and physical properties. quately support transmission of light the optical fi ber. This type of transmis- The wavelength of the optical light sources with larger apertures such sion is referred to as singlemode. source describes the frequency of the as LEDs and vertical-cavity surface- transmitted lightwave (the longer the emitting lasers (VCSELs) by minimiz- Index of refraction wavelength, the lower the lightwave’s ing signal loss and maximizing trans- Careful examination of multimode frequency) and has been selected to mit distances. Small diameter optical signal propagation quickly raises a 14 MAY 2010 Cabling Installation & Maintenance www.cablinginstall.com C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  17. 17. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F NEW STYLE! MOUNTING BRACKETS Just for CLASS 2 LOW VOLTAGE WIRING “Wings” Arlington’s non-metallic mounting brackets offer flip up, hold secure the best way to install class 2 wiring – and seat when mounting wall plates flush with the mounting surface. ! screws are tightened We now offer a single-gang, N EW low profile mounting bracket...LV1LP. Low profile single-gang Recessed It makes quick work of LV1LP Screw Hole installations using 1/2" and or 5/8" drywall installed Thin on cast concrete or Front Lip concrete block walls seat wall plate with furring strips. 2 flush with wall surface In multiple sizes, for existing construction, our low-voltage non-metallic mounting brackets... • Adjust to fit 1/4" to 1" drywall, wallboard or paneling Oval Hole • Install faster – cost less than metal 1 3 4 allows final shifting, ©REV03/2010 Arlington Industries, Inc. straightening of device Single-gang 2-gang 3-gang LV1 LV2 4-gang LV3 LV4 Arlington 80 0/233-4 717 • www.arlingtonlowvoltage.com Patented. Other patents pending EMT BUSHINGS THE LOOP L OW- C O S T H A N G E R ™ THE BEST in CABLE PROTECTION f o r C O M M U N I C AT I O N S C A B L E 5" • Fast & easy 2" 2.5" TL50 Flexible and press-on TL20 TL25 non-metallic, installation The LOOP holds • Holds tight as ▼ a 2" to 5" cables are pulled diameter bundle EMT400 of CAT5 or • Protects cable Also for rigid, fiber optic cable from abrasion IMC and PVC without sagging, rigid conduit bending or damaging • Less expensive TL50 the cable! alternative to costly for a fittings when used The 2.5" TL25 holds 5" diameter just for wire Listed for Air Handling bundle the same amount of Spaces cable as a J-hook at In a variety of sizes 1/2 the COST! for 1/2" to 4" EMT, rigid, PVC © 2001-2006 Arlington Industries, Inc. Listed for Air Handling Spaces Patented. Arlington 800/233-4717 • www.arlnew.com/emt Arlington 800/233-4717 • www.aifittings.com C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F
  18. 18. C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F :: INSTALLATION :: concern about how the design of the effectively limits the bit rate or band- graded-index. Because singlemode optical fiber itself may adversely impact width of the step index optical fiber optical fi ber supports only one wave- signal propagation. The earliest optical to between 20 and 30 million signal length of light, modal dispersion is not fiber design, referred to as step index, cycles per second transmitted over the a concern for this medium. was constructed with a uniform index distance of one kilometer. This band- An additional improvement to multi- of refraction. This meant that all ener- width capacity is typically presented as mode optical fiber design involves opti- gized paths of light, whether propa- 20 MHz∙km to 30 MHz∙km. mizing the media to specifically sup- gating at the core or at the edge of To compensate for this phenome- port the VCSEL light source. Because the optical fiber, traveled at the same non, graded index optical fi ber is con- the source aperture of an LED source speed. The undesired result is that, structed so that the index of refraction exceeds the diameter of the largest over distance, the energized modes gradually changes from a maximum at optical fiber suitable for telecommuni- in a step index optical fiber will sup- the center (“slowing” the light signal) cations (62.5 μm), all modes of a multi- port different path lengths and the to a minimum near the edge (“speed- mode fiber are energized and the pulse output pulse will subsequently have ing up” the light signal) of the optical output is fairly easy to control with lower amplitude and wider spread (lon- fi ber. This increases the bandwidth of graded index optical fiber. However, ger duration) than the input pulse due graded-index fi ber to greater than 1 because the source aperture of a to the faster and slower light paths. billion signal cycles per second trans- VCSEL light source is much less than Modal dispersion describes the degree mitted over the distance of one kilo- the diameter of the smallest optical to which the output pulse has spread meter—1 GHz∙km. Virtually all multi- fiber suitable for telecommunications compared to the input pulse and mode fi bers manufactured today are (50 μm), only a portion of the available _________________ 16 MAY 2010 Cabling Installation & Maintenance www.cablinginstall.com C Previous Page | Contents | Zoom in | Zoom out | Refer a Friend A Installation 7Maintenance | Search Issue | Next Page BMaGS E F

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