How to Create an Enterprise Wireless Infrastructure

By Jeff Kunst, VP, MobileAccess Networks  |  Posted 2008-02-03 Print this article Print

Providing efficient, effective wireless coverage within a major structure, whether it's a skyscraper or a sports stadium, can be more than just problematic. As MobileAccess Vice President Jeff Kunst explains, it takes careful planning and the right kind of antenna system. For another look at how this problem was solved in the real world, see eWEEK's article on wireless networking in the Hearst Tower.

Today's enterprises embrace wireless applications that depend on an array of wireless technologies and frequencies. While IT departments are most familiar with WLAN-based applications, consider the escalating indoor use of mobile phones and PDAs, the regulatory push for public safety radio coverage in large venues, and the buzz surrounding new Mobile WiMax and 4G technologies.

Unfortunately for the IT department, most large enterprise facilities are black holes from a wireless perspective-wireless coverage doesn't just happen.  Most often, RF (radio frequency) signals are blocked by a building's reflective glass coating or signals are absorbed by dense structural materials so they're unable to evenly penetrate the building's core.  To ensure "five-bar" wireless coverage indoors, IT managers need to deploy a "plumbing" infrastructure for wireless.  Known as DAS (Distributed Antenna Systems), these infrastructure solutions overcome a building's inherent structural impediments and deliver robust wireless coverage throughout the facility.

What Is a DAS?

At the simplest level, DAS solutions provide a wired path for delivering wireless services.  They use a cabling infrastructure for RF signal transport from signal sources to a network of distributed antennas that broadcast signals throughout a facility. The DAS cabling infrastructure may employ coaxial, fiber optic, or Category 5/6 cabling in various combinations.

Of course, to function, a DAS must be connected to the RF signal sources associated with wireless services. The simplest option is to "siphon" wireless signals from a nearby cellular tower using a rooftop antenna linked to a BDA (bidirectional amplifier). While this approach is simple, it can impact a carrier's macro network. For a larger investment, a carrier can also place a wireless BTS (base transceiver station) inside the facility with a T1 backhaul connection to its macro network, thereby improving capacity of the larger network.

Once a signal source has been established inside a facility, signals are "distributed" at the building core to ensure even indoor coverage for a variety of RF services. The newest flavor of DAS on the market also supports integrated WLAN capabilities over DAS cabling, eliminating the need for separate WLAN-only wiring. This approach enables IT departments to cost-effectively piggyback their WLAN deployment over the same infrastructure used to support other wireless services.

Jeff Kunst brings more than 15 years of telecommunications experience to MobileAccess Networks. Mr. Kunst was vice president of marketing and product management for Lucent's metroMSX product family. The metroMSX platform was developed by Chromatis Networks, where Mr. Kunst, as director of product management, was instrumental in the acquisition of Chromatis for $4.75 billion. He has also held senior technical and marketing positions at Newbridge Networks, Hughes Networks Systems and the U.S. Coast Guard. Jeff has a B.S. in electrical engineering from the U.S. Coast Guard Academy, in New London, Conn., and an M.S. in electrical engineering from the George Washington University, in Washington, D.C. Jeff Kunst can be reached at

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