Tessco Wireless Journal May June 2016 Page 1 TESSCO Wireless Journal May-June 2016

PLEASE reference this code when ordering from this issue. Technical accuracy is the responsibility of the author(s). 07972 Feature Article Shortest Path Bridging: The End of Spanning Tree Page 1 Feature Article NASA Adds Cell Signal Boosters To Its Comms Toolkit Page 1 Feature Article Wireless as a Short-Term Alternative to Fiber for Cost Savings & Efficiency Page 3 Cost-Effective Capacity From Kathrein Page 5 Fortify Your 4G LTE DAS With PCTEL Page 8 Unlimited Versatility From DDB Enclosures Page 11 Exceed Market Standards With RADWIN Page 12 Innovative Remote Sensing & Software Solutions From Sentera Page 14 This Issue (continued on page 2) The Wireless Journal VOLUME 23 NO. 2 May/June 2016 wirelessjournal.tessco.com System and Product Reviews for Those Who Build, Use and Maintain Wireless PRSRT STD US POSTAGE PAID DENVER, CO PERMIT NO. 5377 Shortest Path Bridging: The End of Spanning Tree Submitted by Alcatel-Lucent Enterprise Shortest path bridging is increasingly expanding its reach beyond the data center and is allowing network administrators a new alternative to service separation, reducing or eliminating the use of spanning tree in their networks. What is Shortest Path Bridging? Shortest path bridging is an open standard supported by multiple vendors and is fully described in IEEE 802.1aq. It uses MAC-in-MAC encapsulation in the data plane and IS-IS in the control plane to provide loop-free separation between services in a network. What's the Traditional Way to Deploy Network Services? The traditional approach to deploying services in a network is to declare a VLAN for each individual service. For instance, a business might declare a VLAN for VoiP, a VLAN for their ERP, a VLAN for their video surveillance cameras, and so on. Each location needing access to this service-typically a building, a floor, or an area of a floor-is then obligated to ensure the VLAN is delivered to that location. Conversely, if there's no reason for a given building to get access to a given service then you simply don't propagate the VLAN there. For instance, limiting financials to only the finance department or video surveillance to security. This means programming each network switch in the path to pass the VLAN along. When networks are small, this is a straightforward way to get the job done. NASA Adds Cell Signal Boosters To Its Comms Toolkit Submitted by SureCall, reprinted with permission from Commercial Integrator Magazine. When it comes to overcoming technological challenges, the engineers at NASA are, by definition, galaxy-class problem solvers. And when it comes to radio fre- quency and wireless communications, it's a sure bet that they hold every distance record to be had. But even NASA has to work within bound- aries. And one boundary, apparent to every- one with a cellphone, is that cell signals that are available outdoors often can't follow us indoors. And it turns out that even NASA needs some help in overcoming such terres- trial troubles. When project managers at the world-re- nown Goddard Space Flight Center, NASA's original space flight research center in Greenbelt, Md., needed to solve problems of poor indoor cell reception, they turned to professionals with worldly expertise, the experts at Washington, D.C.-based DAS Worldwide. The pros' preferred solution for NASA's RF-challenged interiors: cellular sig- nal boosters. Cellular sig- nal boosters are not new. But it took a major federal agreement on standards in 2013 between booster mak- ers, the four major wireless carriers (Verizon, AT&T, T-Mobile, and Sprint) and the FCC to reassure business and indus- try professionals that boosters are a viable, effective, and permissible technology. As a result, businesses and organizations across industry and government, including NASA, now employ boosters to solve their indoor reception issues. DAS Worldwide, headquartered just over a mile from the White House, delivers in-build- ing and outdoor wireless infrastructure solu- tions using the latest technologies that meet their clients' specific needs. Its clients' sites range from airports, to concert halls and sports stadiums, to industrial sites, to corporate and educational campuses, to residential buildings and shopping centers. "We've worked with NASA before, and they know we offer a full portfolio of solutions that PRSRT STD U.S. POSTAGE PAID TESSCO TECHNOLOGIES 11126 McCormick Road Hunt Valley, Maryland USA 21031-1494 CHANGE SERVICE REQUESTED Shortest Path Bridging is a great alternative to traditional VLAN-based networks: better link utilization, faster provisioning, and less downtime as you make changes to the network. Page 14

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