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Cim 20071101 nov_2007
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Cim 20071101 nov_2007

  1. 1. Contents Zoom In Zoom Out For navigation instructions please click here Search Issue Next Page ______________________ Contents Zoom In Zoom Out For navigation instructions please click here Search Issue Next Page
  2. 2. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F Exceptional optical performance comes naturally. Nothing is more treasured in field termination than exceptional optical performance. The secret to UniCam® Pretium™- Performance Connectors is inside – a laser-cleaved, factory-polished fiber stub that ensures outstanding connectivity in a no-epoxy/no-polish (NENP) connector. UniCam Pretium-Performance Multimode Connectors offer 0.1 dB insertion loss. And UniCam Pretium-Performance Single-Mode Connectors enable 0.2 dB insertion loss. That’s exceptional optical performance in less than a minute per fiber, from the most widely deployed NENP connector on the market. Naturally ... Customer-focused innovation is second nature at Corning. www.corning.com/cablesystems/cimls © 2007 Corning Cable Systems LLC / LS-02413 C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F
  3. 3. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F Turn your cable tester into an OTDR and watch the transformation begin. See how the DTX Compact OTDR Module can turn your cable tester into an OTDR and your staff into fiber experts – to completely transform your fiber business. Imagine. A cable tester that becomes a compact, easy-to-use, full-featured OTDR. Better yet, imagine what that means for your business. A single tool to test copper and fiber. An OTDR your current technicians can easily use. Fiber jobs you couldn’t do before. Just snap the DTX Compact OTDR module onto a DTX mainframe – the industry’s benchmark for cable certification. Now you’re ready to test like a fiber expert. Perform Basic (Tier 1) and Extended (Tier 2) fiber certifica- tion. Perform powerful single-ended trouble- shooting. Deliver professional documentation. Win jobs that require OTDR testing and watch your revenue and profits increase. Look to the new DTX Compact OTDR and watch the transformation begin. Go to www.flukenetworks.com/seehow to enter to win a DTX Compact OTDR and see a live demo. N E T W O R K S U P E R V I S I O N ©2007 Fluke Corporation. All rights reserved. 02152 C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F
  4. 4. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGSF Our U.S. area of expertise. No matter where you’re located, our fiber optic cable products are there. Optical Cable Corporation has built a network of reliable stocking distributors and a dedicated sales team committed to getting you the best fiber optic cables for your requirements when you need them...where you need them. For over 20 years, we have been manufacturing the broadest range of top-performing tight-buffered fiber optic cables for most applications in the government, military, and commercial markets. Your order is our top priority. Contact Optical Cable Corporation for a stocking distributor nearest you. We are where you are. 1-800-622-7711 5290 Concourse Drive • Roanoke, Virginia 24019 • Phone 540-265-0690 • www.occfiber.com C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGSF
  5. 5. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F PHOTO BY JANA STOW NOVEMBER 2007 VOL. 15, NO. 11 ABOUT THE COVER While Wi-Fi deployments have had mixed results in many cities, Minneapolis’ features partially built network proved vital in coordinating rescue and relief efforts 9 6A’s final hurdle: testing (But not the kind you think) following a highway bridge collapse this summer. Committee members optimistically look at December as TO LEARN MORE, a potential publish date. PATRICK McLAUGHLIN SEE PAGE 39. 15 Making the right connection: Bonding a shielded system Bonding the system to ground helps ensure optimum performance for your shielded system. TOM TURNER & ROBERT DENNELLY 25 The verdict is in: Court chooses fiber-to-the-desk Texas U.S. District Court rules in favor of an optical cabling solution—for itself. BOB BALLARD, RCDD 33 Energy consumption an overriding issue Federal government involvement is driving improved practices for more efficient operation. PATRICK McLAUGHLIN 39 Wi-Fi trials, tribulations— What’s working, what’s not Many failures and some successes mark cities’ efforts departments to deploy wide scale Wi-Fi. BETSY ZIOBRON 4 Editorial An insider’s take on cable-removal definition 49 INDUSTRY SPOTLIGHT ■ Mini Max cabinets boost school district’s IT upgrade 6 Letters ■ Prysmian unveils high-rise FTTx cable 53 New Products 55 Product Focus: MARKING & LABELING EQUIPMENT CABLING INSTALLATION & MAINTENANCE (ISSN 1073-3108), a trademark, is published 12 times a year, Novemberly, by PennWell Corporation, 1421 South Sheridan Road, Tulsa, OK 74112; telephone (918) 835-3161; fax (918) 831-9497; Web address www.pennwell.com. Editorial offices: 98 Spit Brook Road, Nashua, NH 03062- 5737; telephone (603) 891-0123. © 2007 CABLING INSTALLATION & MAINTENANCE. All rights reserved. Authorization to photocopy items for internal or personal use, or the internal or personal use of specific clients, is granted by CABLING INSTALLATION & MAINTENANCE (ISSN 1073-3108), provided that the appropriate fee is paid directly to Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923 USA; (978) 750-8400. Prior to photocopying items for educational classroom use, please contact Copyright Clearance Center, Inc., 222 Rosewood Drive, Danvers, MA 01923 USA; (978) 750-8400. For further information, check CCC Online at the fol- lowing address: http://www.copyright.com/. All rights reserved. No material may be reprinted. Bulk reprints can be ordered from Diane Troyer, telephone (603) 891-9135. Corporate officers: Frank T. Lauinger, Chairman; Robert F. Biolchini, President and CEO. POSTMASTER: Send address changes to: CABLING INSTALLATION & MAINTENANCE, Circulation Dept., P.O. Box 3280, Northbrook, Il 60065-3280. Return undeliverable Canadian Addresses to: P.O. Box 1632, Windsor, ON N9A 7C9. Periodicals postage paid at Tulsa, OK 74101 and other additional offices. Subscriptions: In the U.S.: one year $74; Canada/Int’l surface : one year $84; International via air: one year $100. If available, back issues can be purchased for $16 in the U.S. and $21 elsewhere. We make portions of our subscriber list available to carefully screened companies that offer products and services that may be important for your work. If you do not want to receive those offers and/or information, please let us know by contacting us at List Services, CABLING INSTALLATION & MAINTENANCE, 98 Spit Brook Road, Nashua, NH 03062-5737-“Canada return address: PO Box 122, Niagara Falls, ON L2E 6S4”. www.cablinginstall.com Cabling Installation & Maintenance ■ November 2007 ■ 3 C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F
  6. 6. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F Chief Editor / Patrick McLaughlin (603) 891-9222 • patrick@pennwell.com Executive Editor / Steve Smith An insider’s take on (603) 891-9139 • stevesm@pennwell.com Senior Editor / Matt Vincent (603) 891-9262 • mattv@pennwell.com cable-removal definition Circulation Manager / Michelle Blake (603) 891-9360 • michellb@pennwell.com Y eah, I know. I climb on the inal abandoned-cable requirements, Art Director / Kelli Mylchreest abandoned-cable soapbox time he explained to me that those re- Lead Illustrator / Dan Rodd and again, and see no reason quirements were perfected over three to apologize for it. So get ready (or revision cycles before they were Senior Vice President/Group Publishing Director Mark Finkelstein get flipping the page), because here I finally included in the NEC. At three (603) 891-9133 • mark@pennwell.com go again. years per cycle, that’s as much as nine Associate Publisher/National Sales Manager Not long after I years of work. In that time, Janeway Ed Murphy (603) 891-9260 • edm@pennwell.com wrote an article in explained, the wording was pondered our July issue en- exhaustively. CABLING INSTALLATION & MAINTENANCE titled “Abandoned Then he gave me his perspective on EXECUTIVE AND EDITORIAL OFFICES cable removal a how to determine if a cable fits the PennWell ATD 98 Spit Brook Road dogged challenge definition of “abandoned.” I had nev- Nashua, NH 03062-5737 Tel: (603) 891-0123, fax: (603) 891-9245 for all” (page 25), er heard it put this way before. Rather Internet: www.cablinginstall.com I received a call than telling me when/if/why a cable from a gentleman not currently in use would have to SUBSCRIPTION INQUIRIES: For subscriptions or to change your format to print who had just read my article and paid be removed from a building, Jane- or digital, please go to: www.cim-subscribe.com. particular attention to the following way laid out the circumstances un- Subscriptions outside the USA are available in digital format only. line: “One potential reason for such der which such a cable can stay in a unpredictable enforcement could be building. Quite simply, it has to meet the sometimes-confounding wording two requirements: 1) It must be ter- within the NEC in which abandoned minated at both ends; 2) It must be CORPORATE OFFICERS cable is referenced.” He suggested I tagged for future use. Chairman / Frank T. Lauinger might want to get in touch with Phil End of story. No need for debate Janeway, who chairs BICSI’s Codes about a cable that’s terminated on President and Chief Executive Officer Robert F. Biolchini Committee ... before Phil read the one end but not the other. No get- Chief Financial Officer / Mark C. Wilmoth article and got in touch with me. ting away with tagging an untermi- Mr. Janeway, I was informed, would nated cable for future use just so you ADVANCED TECHNOLOGY DIVISION not use the word “confounding” to don’t have to rip it out. Senior Executive Assistant Carol Woodward describe those parts of the National As one who has been guilty of treat- Tel: (603) 891-9112, fax: (603) 891-9287 Electrical Code that deal with aban- ing NEC requirements for abandoned- carolw@pennwell.com doned cable. cable removal like they’re the tax code, VP Audience Development / Gloria S. Adams Shortly thereafter, I had the oppor- I found it enlightening to hear from tunity to speak to Phil Janeway, and one of the men who helped craft those ATD PUBLISHING SERVICES DEPARTMENTS discovered the assessment I was giv- requirements. Hopefully, you find it Art Director / Meg Fuschetti en was absolutely true. He does not interesting too. Production Director / Mari Rodriguez (603) 891-9193 • marir@pennwell.com believe the abandoned-cable-remov- al requirements are vague, nor do Marketing Communication Manager Kristen Jones they provide loopholes that would al- (603) 891-9425 • kristenj@pennwell.com low building owners to keep in place Ad Traffic Manager / Jackie Linker cable that will never again be put to (918) 832-9314 • jackiel@pennwell.com any practical use. As a member of PATRICK McLAUGHLIN Mc the National Fire Protection Associ- Chief Editor PRINTED IN THE USA GST NO. 126813153 ation group that developed the orig- patrick@pennwell.com Publications Mail Agreement Number 40052420 4 ■ November 2007 ■ Cabling Installation & Maintenance www.cablinginstall.com C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F
  7. 7. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F THE CUT-OVER. THE MOMENT OF TRUTH. OCCASIONALLY FOLLOWED BY THE MOMENTS OF DREAD, BLAME AND CONFUSION. There comes a moment in every project when each decision you’ve made is put to the test. Success and failure hang in the balance, as the switch is made from the old system to the new. At moments like these, your most crucial decision was actually one of your first: your distributor. If it’s Graybar, you’re not on your own. Our nationwide supply chain, local support network and trusted suppliers like Berk-Tek can stand up to any ‘moment of truth’ you may encounter. So take a deep breath; we’ll be right there. FOR MORE INFORMATION, VISIT GRAYBAR.COM/BERKTEK OR CALL 1-800-GRAYBAR(472-9227). _____________ C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F
  8. 8. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F Who’s dense? The photo on page 37 of your Sep- tember issue (right) is of a tele- phone system, not a blade server. Attention to detail in the industry is important. Good article, though. have thought that for a long time now. If you look closely at the pictures Randy Aldous in the article “Back to school with Submitted via e-mail 10-Gbit Ethernet” (page 19), you can see how bulky the cables are. I don’t think some While the telephone system pictured on that page is dense, of the cables pictured will pass 10-Gbit either. Some and a blade server also is dense, evidently neither one is as cable ties are too tight, some cables look like they are bent dense as the author/editor who chose to include the photo in in a 90-degree turn going into the patch panel, no cable the article.—Ed. management/support, too much length of twisted-pair wire extended out from the end of the cable before it is Fiber over copper punched down … just to name a few things I can see from From your September issue, I have to agree with the arti- the pictures. cle Doug Coleman of Corning Cable Systems wrote: “Opti- Ronnie Sugarek, RCDD/OSP/TPM cal connectivity a good choice in the data center” (page 9). I Submitted via e-mail ___________ 6 ■ November 2007 ■ Cabling Installation & Maintenance www.cablinginstall.com C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F
  9. 9. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F ICC’s contractors! Other contractors. ALL NEW Pre-Loaded Fiber Optic Enclosures! Saves time from installing individual fiber optic adapters For high-speed data transmission Designed for superior mating with fiber optic jumpers Pre-loaded SC and ST styles Save 40% or more... ICC can help! Save up to 40%! Toll Free: 888.ASK.4.ICC E-mail: csr@icc.com Want to know how to save up to $8000.00? ......................... Web: www.icc.com/savemore PremiumProducts • ProvenPerformance • CompetitivePrices...ICC © Copyright 2007, ICC. ICC and ICC logo are registered trade name and trademark. All rights reserved. 1107 C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F
  10. 10. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F ® Now. GigaLAN10 with reduced O.D. Like the Mars Rover’s continuing leadership in the Conduit & Cable Tray Fill Comparison Chart exploration of space, Mohawk’s new GigaLAN 10 Old OD .320” New OD .295 Old OD .320” New OD .295” UTP cable with reduced O.D. continues to lead 1.5” conduit 9 cables 10 cables the way in supporting 10GbE. 2” conduit 15 cables 18 cables The reduced .295” OD brings enhanced flexi- 3” conduit 35 cables 41 cables bility and installation ease into the conduit. This 4” conduit 62 cables 73 cables cable offers a cost-effective solution for high band- 12” cable tray* 447 cables 562 cables width applications from desktop to data centers. 24” cable tray* 955 cables 1124 cables GigaLAN 10 is the highest performance 36” cable tray* 1432 cables 1686 cables Augmented Category 6 Cable which supports *4” deep cable tray 10BASE-T to a full 100 meters, exceeding the latest IEEE and TIA/EIA requirements. MOHAWK For more information call 800 422 9961 or visit www.mohawk-cable.com. Cabling Excellence for Open Architecture C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F
  11. 11. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F www.cablinginstall.com design 6A’s final hurdle: testing (But not the kind you think) I f all goes according to plan, the final chapter of the Telecommunications Industry Committee members optimistically look at December as a potential publish date. Association’s (TIA; www.tiaonline.org) standardization of Electrical and Electronics Engineers’ (IEEE; www. ____ of Augmented Category 6 (Category 6A) specifications ieee.org) 10GBase-T specifications. Such high frequen- will be written before this calendar year ends. The group cies have been new territory for the group, which has has its sights set on a meeting the second week of Decem- been challenged to make some minute measurements of ber, at which all outstanding issues may be resolved and connectors to 500 MHz without using ASTM the standard approved for publication. International (www.astm.org) tests as references, be- “The standard is in great shape,” says Val Rybinski, cause no such tests exist. global sales engineer with Siemon (www.siemon.com) “We can make measurements with a certain amount of and newly-re-elected chair of the TIA’s TR-42.7 Tele- inaccuracy—say 1 dB, for example,” Rybinski continues. communications Copper Cabling Systems Committee. “What we’d like to do in the standard is get that inaccu- “The transmission numbers have been firm for a long racy reduced, and the way to do that is to develop better time; they have not changed in two years,” she adds. In test fi xturing. We believe the new measurement fi xture addition to establishing link and channel performance made specifically for connecting hardware will allow us requirements, TIA standards also specify the perfor- to make very accurate measurements.” mance of components within those systems. And it’s Effectively isolating a connector and measuring that some of those component specifications—for connect- connector’s performance presents numerous challenges ing hardware, in particular—that TR-42.7 must fi nalize from technical and practical standpoints, and TR- before the standard is complete. 42.7 formed a task group—headed by the committee’s co-chair, Sterling Vaden—to develop and refine a test Measuring component compliance? fi xture for the purpose. From a standards-process viewpoint, the only part of the Among the technical challenges the group has faced standard that is still under review—and, therefore, still are maintaining good impedance around 100 Ω at has the potential to change—is the procedure for mea- 500 MHz, and one of the biggest practical challenge is suring connecting-hardware component compliance. isolating the twisted pairs from the measurement. His- “We froze the entire body of the document except a few torically, the characteristics of the test leads used in the minor technical changes” related to the component-mea- process have been subject to change during the testing surement procedure, Rybinski states. So, it is safe to say process, due at least in some part to the leads’ movement the link and channel specifications are indeed final, as while testing is underway. The fixture recently developed they have been for two years. and currently being used by the test-fi xture task group The most recent category-rated TIA specification, Cat- keeps the test leads very precisely located, thereby allow- egory 6, specified performance levels to 250 MHz. Cat- ing them to be subtracted from the measurement and egory 6A doubles that frequency to 500 MHz, which is allowing as pure a connector measurement as possible. in sync with the maximum frequency of the Institute If the connector fits… PATRICK MCLAUGHLIN is chief editor of Cabling Installation & The next step, one that is set to be taken as this article is Maintenance. going to press, is a series of round-robin testing in ➤ www.cablinginstall.com Cabling Installation & Maintenance ■ November 2007 ■ 9 C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F
  12. 12. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F which multiple manufacturers’ connectors are tested using group is close to a final document. “At some point, jacks and a single fi xture. Hugo Draye, product manager for certifica- plugs need to be defined as components. Link and channel per- tion products with Fluke Networks (www.flukenetworks.com), ________________ formance reports must be based on individual components.” points out that such testing is critical to arguably the most im- Draye recalls that similar challenges faced Category 6, when portant characteristics of standard-compliant products—in- early pre-standard plugs and jacks were not interoperable teroperability and backward compatibility. among vendors, nor necessarily backward-compatible with “Manufacturers of connecting hardware are ready to conduct lower-category hardware. Back then, technology progressed round-robin testing of each component,” says Draye. “That and connecting-hardware manufacturers refined their compo- happens late in the standards process,” and he notes that the nents to perform within the TIA-established parameters that would ensure both interoperability and backward compatibility. With Category 6A, TIA is on the threshold of finalizing the means for measuring connectors’ ability Premise Wiring to perform within those parameters. Somewhat ironically, it has been an- CAT 6 • CAT 6a • CAT 7a “The standards clearly de- Modular Plugs & Jacks fine what to measure and how to do it to ensure valid results. But they do not address sampling method.” other form of Category 6A testing—alien crosstalk and the means of field-testing for it—that has generated about 99% of the pre-standard buzz. On that topic, Rybinski offers two facts that may surprise many: • Everything related to field-testing proce- dures for Category 6A have been closed. The specifications are complete. • Standards have never made field test- Stewart Connector understands that specifying and sourcing quality modular ing mandatory. Category 6A is no connectors for premise and campuswide communications systems can be exception. a tough job. Especially as technology, standards, and products continue to evolve. That is why we ve engineered our plugs and jacks to ensure your networks superior performance... today and tomorrow. Sampling undefined To that end, Draye observes, “The TIA and PLUGS-CAT 3 to 7a JACKS-CAT 3 to 7a IEEE have said, ‘Here’s how you measure, • Shielded and Unshielded • Shielded and Unshielded here are limit lines, et cetera.’ The stan- • For Solid & Stranded Cable • Horizontal, Vertical, and Angled dards clearly define what to measure and • Polished Contacts for High Mounting Options how to do it to ensure valid results. But they Insertion Life • Single and Multi-Port Designs do not address the sampling method.” • Multiple Keying and Wire • PCB and Cable Mounted Designs In other words, the standards are silent Management Options and users are left to make their own deci- sions about testing all, some, or no Cate- Stewart Connector gory 6A circuits for alien crosstalk. As Rybinski pointed out, this is noth- www.stewartconnector.com • 717/235-7512 ing new. 10 ■ November 2007 ■ Cabling Installation & Maintenance www.cablinginstall.com C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F
  13. 13. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F Create Clear, Crisp Labels. Deliver a Professional Image. Get Referrals. Repeat. Instill confidence in your installations. Count on P-touch® labelers for high quality labels, with crisp, sharp printing. They’re easy-to-use, reliable and affordable, and P-touch® PORTABLE tapes come in a range of adhesive formulations to ensure Rugged, ergonomic design works your labels stay stuck on even hard-to-hold surfaces. where you do – inside or out Show you take pride in your work, impress your clients, and grow your business. VERSATILE Perfect-fit labels for patch panels, For more information, visit www.brother.com or face plates, cables and more! e-mail industrysolutions@brother.com EASY-TO-USE Use “hot keys” to quickly print industry symbols, bar codes, and your saved label templates DOWNLOADABLE Download Excel® and Access® files, symbols and logos from your PC, and print labels anywhere ® S PT-1010 TION SOLU For quick labeling – LING PT-9500 L LABE up to 2 line printing STRIA PT-1650 PC-connectible labeling – INDU Carrying case included – Around $40* print labels in advance up to 7 line printing Around $300* Around $170* Available in catalogs and online (product availability varies by reseller) at: P-touch® products include starter roll of tape. Additional purchase required for all other tape and label supplies. © 2007 Brother International Corporation, Bridgewater, NJ All trademarks and registered trademarks referenced herein are the property of their respective companies. Brother Industries, Ltd. Nagoya, Japan. *Estimated street price www.brother.com C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F
  14. 14. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F BUSINESSLINK FROM DODGE, ® THERE WHEN YOU NEED US. It’s the one resource business owners rely on. With extended hours, next bay priority service, free loaner vehicles and free membership, you can forget about downtime. And best of all, BusinessLink ® enrollment is free, no matter what you drive. For more info, visit dodge.com/businesslink or call 877-2THELINK (877-284-3546). C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F
  15. 15. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F 2007, www.intellichoice.com™ Chrysler Financial is a business unit of DaimlerChrysler Financial Services. Dodge and BusinessLink are registered trademarks of DaimlerChrysler. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F
  16. 16. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F ERITECH® Grounding & A B Bonding Products Enhance Your Data Center Reliability ERITECH® Signal ERITECH® Signal Reference Grid System Reference Grid System • High frequency, low • Allows for easy field impedance grounding construction of wire signal system reference grids ERICO® provides a comprehensive approach to grounding, • Prefabricated using 26ga. • Accepts up to 3 conductors 2” copper strip allowing for grid and pigtail bonding, surge protection and lightning protection applications. • IEEE® 1100 recommended construction using only one Trust ERICO products to enhance safety, reliability and prevent • Attach grid sections using connector CADWELD® “TW” connections damage to your datacenter equipment. C D ERITECH® ERITECH® Ground Bars HAMMERLOCK • Provide a convenient, single- • Connects the grounding point grounding and conductor to the ground bonding location rod with the swing of • Create an equipotential plane a hammer between service grounds and • Has greater current equipment during fault and carrying capacity than transient conditions most mechanical ground • TIA©/EIA© 607 Compliant rod connectors E F ERITECH® EK16/EK17 ERITECH® RC70/RC100 Direct-Burial Ground Heavy-Duty Rebar Clamps to Rebar Clamps • Features a conductor lay-in • Meets code requirements slot that reduces installation where AHJs (Authorities time Having Jurisdiction) call for • Designed to handle a range two connections between the of conductors from #10 to rebar and the conductor #2 AWG • Easy to install since all attachment hardware is on one side of the clamp A B F G H E C H G ERITECH® Convenient ERITECH® Ground Electrode Copper-bonded (CGE) Kits Ground Rods • Contain two 4-ft, 5/8-in. • Exceed the requirements diameter, ERITECH® copper- of ANSI®/UL® 467, CSA© and bonded ground rods, a ANSI/NEMA® GR-1 and last Contact ERICO at 1-800-677-9089 drive sleeve, a compression 40+ years or visit www.erico.com coupling and a grounding • ERICO also offers a connector complete line of ground • Easier to install from ground rods and accessories, level and more convenient including stainless steel to transport than 8-ft and galvanized ANSI is a registered trademark of the American National Standards Institute. ground rods CSA standards are a copyright of the Canadian Standards Association International. IEEE standards are a copyright of the Institution of Electrical and Electronic Engineers NEMA is a registered trademark of the National Electrical Manufacturers Association. UL is a registered trademark of Underwriters Laboratories, Inc. EIA is a copyright of the Electronic Industries Alliance TIA is a copyright of the Telecommunications Industry Association C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F
  17. 17. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F www.cablinginstall.com installation Make the right connection: Bonding a shielded system W ith the publica- tion of the IEEE 802.3an 10GBase-T standard in 2006, Bonding the system to ground helps ensure optimum performance of your shielded system. Augmented Category 6 (i.e., Category 6A) cabling sys- PSANEXT performance comparison tems are being deployed in data centers. Due to the high -20 electrical frequency needed to support 10-Gbit/sec -30 Category 6 data rates over copper cabling, the mitigation of signal -40 coupling between cables in close proximity, known as PSANEXT -50 IEEE limit alien crosstalk (alien near-end crosstalk or NEXT, and (db) -60 alien equal-level far-end crosstalk or ELFEXT, which -70 Category 6A UTP is also called alien attenuation-to-crosstalk-ratio at -80 Category 6 ASTP the far end, or AACRF), is critical to meet 10GBase-T -90 100 200 300 400 500 600 performance standards. Frequency (MHz) Shielded Category 6A links offer clear performance Power-sum alien near-end crosstalk performance characteristics benefits at 10 Gbits/sec by reducing or eliminating the of copper cabling systems over a 100-meter channel. effect of alien crosstalk and providing superior immunity to electromagnetic interference (EMI), such as radio-fre- links to the workstation due to its easy termination and quency interference (RFI). But it is important that shielded installation in the field, and cost-effective electronics. Of cabling systems be properly bonded and grounded to the available copper cabling types, unshielded twisted- ensure the highest level of performance and to protect pair (UTP) Category 6A copper solutions are specifically expensive IT equipment. If shielded cabling systems are designed to reduce the effect of alien crosstalk by incor- not properly designed and/or installed, transmission porating innovative features into both the cable (such as errors may occur due to unwanted additional noise. increased separation between cables and tighter twist Let’s consider the performance benefits of shielded rates) and the connectors (such as crosstalk suppression twisted-pair structured cabling, and answer the follow- within the printed circuit board). ing top-of-mind user questions on bonding and ground- Shielded Category 6A systems offer a different tech- ing best practices: nique to suppress alien crosstalk, using foil and/or • Where, and how often, should the shielded cabling braided shielding within the cable to prevent signals system be bonded? from coupling between cables. These screens provide • How can I tell if my existing grounding system is significant margin over IEEE 802.3an specifications for adequate for shielded cable? power-sum alien attenuation-to-crosstalk ratio at the far • How can I tell if ground-loop problems exist at the end (PSAACRF), virtually eliminating the effect of alien workstation, and what can be done about the loops? crosstalk and providing more than 20 dB of headroom over comparable UTP systems. This impact is similar Performance benefits of 6A whether the cable contains individual shields around Copper is the preferred structured cabling medium each pair or a single foil around all pairs. for most connections in the data center and horizontal The increased suppression of ANEXT and AACRF by TOM TURNER is business development manager and ROBERT shielded cables also eliminates the need for costly and DENNELLY is product liner manager at Panduit Corp. (www.panduit.com). time-consuming field-testing of alien crosstalk. Fur- ➤ www.cablinginstall.com Cabling Installation & Maintenance ■ November 2007 ■ 15 C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F
  18. 18. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F Typical bonding and grounding ther, the foil shields provide superior immunity to TGB (telecommunications grounding busbar) EMI/RFI and makes it difficult for unauthorized TBB (telecommunications users to “listen in” by providing a more-secure bonding backbone) data environment for such markets as government or such applications as gaming that require strong levels of security. Importance of bonding, grounding Although overall integrity of the power and grounding system is crucial to ensure the reli- ability of all networked equipment, there is often confusion over how to properly ground and bond shielded cabling solutions. The primary purpose of the grounding and bond- ing system is to create a robust path for equaliza- MCBN (mesh common tion of voltages and for resultant surge currents to bonding network) return to their source. Lightning, power-system fault currents, circuit switching (motors on and This example of a telecommunications bonding and grounding system exhibits the off ), activation of surge-protection devices, and essential principles as well as the recommendations of the TIA-942, ANSI J-STD-607-A, electrostatic discharge (ESD) are common causes and IEEE Std 1100-2005 specifications. of transient voltages and electrical surges. Ground loops are a potential disruption to data signals, and develop to standards TIA-942, ANSI J-STD-607-A, and IEEE Std 1100- when a voltage difference occurs in the ground at each end of a 2005 (The Emerald Book), here are the principles of a properly cable shield, causing a current to flow through the shield. designed grounding and bonding system in a data center: To realize the full performance benefits of any structured • An intentional design—each connection must be engineered cabling system, shielded or unshielded, the overall integrity of and installed to properly handle the anticipated currents; the bonding and grounding system must be sound. According • Bonds all metallic components to the grounding system (e.g., equipment, racks, cabinets, access floors, Structured ground system ladder racks, cable trays, water pipes, conduit, building steel); • Visually verifiable and generally arranged for 1 ease of inspection and testing; • Equalization paths and ports for ESD-protec- 3 tion wrist straps; The system grounding protection starts at the The patch panel is • Support for the proper operation of surge protec- jack module with bonded to the rack tion device for IT equipment and power circuits; 360º shielding with bonding screws. • Electromagnetic compatibility within the data center environment; 2 • Adherence to all local electrical codes, and listed with a nationally recognized test lab. In addition, it is recommended that complete 4 system bonding be observed over the entire net- Finally, the entire The connector is then work to minimize any electrical potential dif- system is bonded from bonded to the the rack to MCBN ferences. Complete system bonding for any patch panel located in the floor structured cabling system exhibits the following characteristics: • Electrical continuity throughout the rack; • Bonds equipment and patch panels to racks/ cabinets; Following these four steps with the Structured Ground System provides robust connections • Bonds each rack/cabinet to the telecommunica- that have low resistance, are easy to install, and are easily checked during inspections. tions grounding busbar (TGB); this may ➤ 16 ■ November 2007 ■ Cabling Installation & Maintenance www.cablinginstall.com C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F
  19. 19. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F YOUR COMPLETE SOURCE FOR GROUNDING PRODUCTS Grounding • Exothermic • Lightning Protection Grounding Busbars • UL Listed • Meets ANSI-J-STD-607-A Requirements • Kits Available Harger Lightning & Grounding 301 Ziegler Drive, Grayslake, IL 60030 Phone: 847.548.8700 • 800.842.7437 • Fax: 847.548.8755 Website: www.harger.com • Email: hargersales@harger.com C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue B Next Page EMaGS F
  20. 20. C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F Shielded cable/jack be done via a mesh common bonding network This shielded cable and jack (MCBN); combination from Panduit pro- • Bonds the telecommunications grounding vides 360° shielding termination. system to the alternating-current (AC) ser- vice panels serving the IT equipment in the We recommend a 4-step room; such bonding promotes equivalent process to properly bond the ground potential between the IT equipment shield at the patch panel: grounding and the equipment ground of the Foil of 1. Bond all the shielding shielded cable 360˚ power system(s) serving the IT equipment; termination (foil and/or braid) of the • Proper bonding and grounding elements cap data cable to the shielded (clear covers, ID labels, green-coded conduc- jack module, which provides tors) to aid in visual verification of the system. 360° shielding termination. 2. Snap the jack module into an all-metal patch panel to Best practices for shielded create a bond between the module and the unpainted tabs For shielded cabling systems, the additional step of bonding the on the patch panel. cable shield is essential to ensure proper system performance. 3. Attach the patch panel to the rack using thread-forming The foil screen in Category 6A shielded cabling already pro- bonding screws; the thread on the screws removes paint vides enhanced system performance by preventing unwanted from the thread holes on the rack, and the serrations on cable-to-cable signal coupling (i.e., alien crosstalk). A proper- the head of the screws remove paint from the patch panel, ly bonded and grounded shielded cabling system further pro- creating a high-performance electrical bond between the tects twisted pairs from external noise by carrying induced patch panel and the rack. current along the continuous foil shield of the cable to the 4. So long as electrical continuity exists throughout the rack, transceivers at each end of the cable. the last step is to bond the rack to the main busbar or MCBN located under the data center’s raised floor. To ensure long- term integrity of the system, always use compression con- nectors (not mechanical) so the connection does not loosen with vibration. Once cabling to the patch field has been bonded, atten- tion can be turned to the rest of the bonding and grounding system. Here are several “best practices” that must be con- sidered during the design and installation of the rest of your shielded structured cabling system: Best Practice 1: Grounding the cable shield During installation, a frequently asked question is whether the installer should ground one or both ends of a shielded cable channel. Generally, the cable shield is bonded to the grounded equipment chassis or rack at each access or patch location. In other words, if the IT equipment is grounded, then any shielded cables used to connect equipment to patch panels, or to other equipment, must be grounded. A typical shielded structured cabling channel runs from a switch to the workstation and comprises two patch cord links and the shielded horizontal link. One end of the channel starts in the data center where the switch, patch panel, and shielded patch cord linking them must be properly bonded to the rack. The rack is tied to the telecommunications grounding system, which in turn is bonded to the AC power system. The other end of the channel terminates outside the data _____________________________________ center at the workstation outlet. An issue to considere is wheth- er a shielded cabling link at this outlet location can be ➤ 18 ■ November 2007 ■ Cabling Installation & Maintenance www.cablinginstall.com C Previous Page A Installation 7Maintenance Contents Zoom In Zoom Out Front Cover Search Issue Next Page EMaGS B F

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