Despite relatively limited revenue growth for vendors - caused by steep drops in per unit pricing - the wireless LAN market is growing like crazy. Unit sales continue to grow at a double digit pace.  More than half of the enterprises we surveyed recently either had WLAN equipment in place, or were planning to have it within a year. As WLANs proliferate, however, many enterprises and public venues face an issue: how to provide secured, policy-driven access to different groups of end users.

Some enterprises and venues have taken the approach of deploying separate WLAN infrastructures for separate groups of users - for example, an airport might have one network established for airline personnel, and a separate network providing hot spot access to passengers. This approach can work but can be expensive - and it requires a cooperative approach (in terms of site survey and channel selection) to reduce interference between the networks.

Another approach to this problem is being offered by Chantry Networks, a start-up focused on Layer 3 WLANs. Chantry’s BeaconWorks product line has been designed around the concept that WLANs can be virtualized by the centralized Layer 3 router. A single WLAN infrastructure could therefore support a wide variety of users simultaneously, eliminating inter-network interference while still supporting strong security. The BeaconWorks system can simultaneously support different authentication systems, different billing systems and even different IP addressing schemes for each virtual WLAN within the overall network.

Chantry’s first marquee deployment of this new technology is being trialed today in a large (over ½ million square foot) convention center. The owners of the convention center saw three distinct groups of “customers” for WLAN solutions:

* Conference exhibitors who traditionally paid for wired Ethernet connections to the convention center’s broadband access during shows.
* Conference attendees looking for quick hot spot access to e-mail and the Web.
* Convention center employees (and tenant company employees) requiring high-speed network access.

Using a single physical wireless infrastructure to provide secured virtual WLANs was an attractive solution for this convention center, from both cost and revenue perspectives.