Tessco Wireless Journal May June 2016 Page 2 TESSCO Wireless Journal May-June 2016

MAY JUNE 2016 Product information and performance claims are provided by manufacturers. 2 FEATURED SOLUTIONS A Correction to the Previous Issue of The Wireless Journal In the previous issue of The Wireless Journal, we incorrectly identified John Santo, Retired Executive Director of the DHS Joint Wireless Program as the moderator of the DAS track presentation at TESSCO One. Mr. Santo actually moderated the Public Safety Panel at the event. The main speaker at the DAS presentation was Paula Doublin, AVP-Construction & Engineering, AT&T Technology Operations. We regret the error. can be integrated into any environment to meet just about any need," said Joe Comizio, business development executive for DAS Worldwide. "When we were briefed on their problems and asked to bid on providing a solution, we knew immediately that boosters would be the best solution for both the sites where they needed help." According to Comizio, the two locations where NASA workers needed to have cell service were the Satellite Services Capabilities Offices and James Webb Space Telescope facility. The SSCO is a 15,000 sq. ft. facility where NASA develops solutions for on-orbit spacecraft refueling and repair, the assembly of large structures in orbit, and modular devices to upgrade spacecraft. According to NASA, these capabilities offer mission operators options for ex- tended mission operations, upgradability, reconfiguration, and recovery. The other facility is the assembly building for the James Webb Space Telescope, which according to NASA is "a space-based ob- servatory, optimized for infrared wavelengths, which will comple- ment and extend the discoveries of the Hubble Space Telescope and enable JWST to look further back in time to see the first gal- axies that formed in the universe, and to peer inside dust clouds where stars and planetary systems are forming today." "You might think that with all their intelligence and access to technology, NASA engineers would develop their own solution for in-building cellular reception," said Comizio. "But their approach is, why reinvent the wheel? If there is a proven OTS [off-the-shelf] solution that we can have installed by professionals, then let's fo- cus our resources on the projects in front of us." Comizio said his team's go-to booster is the SureCall Force5. "Quite simply, it's a bulletproof performer. We were able to cover the Satellite Services building with a single booster and four indoor antennas, and we were able to get it done in about three days during regular business hours with no disruptions to NASA workers' schedules. The JWST space, though a bit larger, also only required a single booster and several antennas, so here again, we were able to get the job done in just three days without any workflow disruption." While the NASA buildings could each be covered with a single booster system incorporating multiple antennas, larger facilities can be covered by using additional systems as needed. Even with options for more robust solutions at hand, Comizio offered this observation about cellular signal boosters: "They are simply the most effective, cost-efficient solution for providing in-building cell signal coverage. And the market for them is huge." (continued from page 1) NASA Adds Cell Signal Boosters To Its Comms Toolkit Shortest Path Bridging: The End of Spanning Tree For more information, visit www.tessco.com/go/surecall. About SureCall SureCall, the cell phone signal booster leader in combining high quality technology with innova- tive designs, produces award-winning boosters that dramatically improve cell phone reception for homes, cars and businesses. The company's line of FCC-approved boost- ers for personal, commercial and industrial use, increases the range and reception of almost any cellular call and/or data transmis- sion. Founded in 2001 and based in the Silicon Valley, SureCall is an industry leader with mul- tiple patents and patents-pending on their su- perior signal booster technology. The company continues to develop innovative new products that address the changing needs of all types of cellular and mobile broadband users. What Are the Problems With This Approach? Problem one is complexity. As the number of services and locations grows things get increasingly difficult to manage. Each new location, each new service, each departmental move causes a big change in the network since the VLANs have to be added to or modified at every switch in the path. This is time consuming and prone to error, and the problem gets worse the bigger your network gets. The second problem is a side-effect of using VLANs. VLANs are layer 2 constructs, and the way to learn a layer 2 topology is through the use of spanning tree. Spanning tree isn't particularly fast and it isn't particularly smart; in order to avoid loops, spanning tree will leave physical links unused in a typical network. That gigabit link you paid dearly to provision may in fact be sitting idle. Additionally, a given service may not actually choose the shortest path, causing performance issues for some users. How Does the Picture Improve With SPB? With an SPB-based network, layer 2 services can be distributed throughout the enterprise painlessly. The problems of a traditional VLAN-based network disappear. In an SPB network, a new location for a service is provisioned at the edge of the network-the rest happens automatically. This significantly speeds up deployment and reduces the risk of error. Another benefit with SPB is that all links are used, and the shortest path is always chosen. No more spanning tree means no more idle links. In Conclusion SPB is a great alternative to traditional VLAN-based networks: you get better link utilization, faster provisioning, and less downtime as you make changes to the network. It's supported by a number of vendors, including Alcatel- Lucent Enterprise. Visit www.tessco.com/go/alcatel-lucent. FORCE 5 REPEATER KIT TESSCO No. 556142 The OmniSwitch 6860 offers enhanced quality of service, user authentication, deep packet inspection and comprehensive security features to secure the network edge while accommodating user and device mobility with a high degree of integration between the wired and wireless LAN. TESSCO No. 516151 AGGREGATION SWITCH

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