Wireless Networking Basics

Building a wireless network requires two distinct types of hardware components, wireless access points, and wireless access cards. The wireless access point is a device, which is attached to an existing computer network via a standard Ethernet cable. It has an antenna on it, which allows it to broadcast and receive signals from PCs and other devices. Each device wishing to communicate with the access point needs a wireless access card, which also contains an antenna. The current wireless standard, called 802.11g, allows for up to 54 megabits of data per second to be transmitted between the desired access point and the access card. While not quite as fast as wired networks, which typically run at 100 megabits to 1000 megabits per second, wireless networks offer more flexibility, and can be less expensive to install. This is especially true for older buildings where installing cable can become cost prohibitive.

Cutting Corners of Wireless Networks

Wireless networks use radio frequency waves to transmit information, and thus they are susceptible to being blocked by walls and other obstructions in a building. These obstructions can cause "dead zones" where the radio waves are unable to reach their intended recipients. Microwave ovens and other radio frequency emitting devices can also wreak havoc on wireless signals. The solution is to place your wireless access points strategically around your building so that interference is minimized. When the distance from a wireless access point to the wireless device is more than a few dozen meters, wireless repeaters can be installed to boost the signal. These repeaters can also be placed so that the wireless signals can be accessible from all corners of the building.

Wireless Network Security Solved

Installing a simple wireless network is pretty straightforward, but installing a secure wireless network can be substantially more difficult. However, an Ann Arbor company called Interlink Networks now offers their LucidLink products, which make installing comprehensive wireless network security a snap. Before LucidLink became available, an organization wishing to lock down their wireless network would need to hire expensive network security consultants to install and manage the wireless portion of the network. LucidLink packages all of this expertise into a software add-on that is so easy to use that even a small company's office manager can easily take control over who is accessing the company network via wireless. It goes above and beyond simple address authentication (standard with most wireless routers), and implements what is called a RADIUS server. RADIUS servers are what large organizations spend thousands of dollars installing and maintaining in order to secure their large (1000+ node) wireless networks. Until now, installing a RADIUS server was out of the price range for all but the largest companies. In contrast, LucidLink's product can be purchased for as little as $99 for a 3 user Home Office Edition, $449 for a 10 user version, and goes up to $3995 for a 250 user version.

Summary of Wireless Networks

While there are still issues with making sure that all areas of a building are covered, the current WiFi standard (802.11g) has a more powerful signal, meaning less emphasis needs to be placed on the locations of attached devices. However, it is still recommended that a professional site survey be done to verify that all required areas of the building can be reached by the wireless signal. Meanwhile, Interlink Networks has finally solved the security problem at a price that is affordable for small and medium sized business.

About the author
Terrence A. Weadock is the President and Founder of Dominant Systems Corporation, an Ann Arbor-based computer network solutions provider. http://www.domsys.com