April 14, 2005 4:00 AM PDT

FAQ: Wi-Fi alphabet soup

Fast-paced innovation can be exhilarating, but it can also be a recipe for confusion.

Take Wi-Fi, the popular wireless-networking technology that's taken the computer and consumer electronics industries by storm. The term specifically refers to a handful of standards approved by industry groups that has made wireless networking inexpensive and nearly unbiquitous in the latest gadgets and computers. The Wi-Fi standards use unlicensed radio spectrum to transfer data between devices, such as a laptop and a wireless-networking router.

802.11b was the first of the Wi-Fi standards to become popular about five years ago. Two other standards, 802.11a and 802.11g, have joined it as Wi-Fi standards, and still another, 802.11n, is on the way, although still a way off. Some of these work together, but some don't. Each offers slightly different advantages and disadvantages. All are available in commercial products you can buy now.


What's new:
Wireless networking has become common in the latest computers and gadgets, with the tech that drives it morphing faster than you can say "router."

Bottom line:
Wireless-networking standards can be daunting: Some work together, some don't. Each has advantages and disadvantages. All are available in commercial products you can buy now. Get fluent in Wi-Fi speak so you can pick the gear that's right for you.

More stories about Wi-Fi

Sorting out the alphabet soup can be as frustrating as untangling the ball of wires behind your PC that the standards are supposed to help replace. For example, 802.11n is still in development but manufacturers are trying to get a jump on the demand for it by developing products using a technology that 802.11n will be based on. Called MIMO, it's getting lots of buzz as some wireless-router makers tout it as the most powerful flavor of Wi-Fi to date.

Here are the basics to begin cutting through the knot.

What are the different flavors of Wi-Fi?
Wi-Fi standards are set by the Institute of Electrical and Electronics Engineers, or IEEE, and the Wi-Fi Alliance, an industry group responsible for interoperability testing. So far they have finalized and approved three standards: 802.11a, 802.11b and 802.11g.

802.11n is a proposed specification that will become a Wi-Fi standard once it's finalized by the IEEE and the Wi-Fi Alliance completes its interoperability testing. Groups have submitted various 802.11n proposals to the IEEE, but are still debating what to include in the standard. It isn't expected to be completed until late 2006, with products based on the standard coming out in early 2007.

Some companies are also touting a wireless-networking technology known as MIMO. This is not technically a variety of Wi-Fi, or even an industry standard. Rather, it is the technology that's expected to form the basis of 802.11n.

What is MIMO and what does it do?
MIMO (pronounced my-mo) stands for multiple input, multiple output and refers to the use of more than one antenna to send and receive two or more unique data streams over the same channel simultaneously in wireless devices, resulting in networks with long ranges and high throughputs. It is currently the primary basis for the proposed 802.11n standard.

In addition to multiple antennas, MIMO products use specialized software, allowing data sent from access points in multiple streams to be received and deciphered by clients. In combination, the multiple antennas and software allow data to be reliably sent and received in environments with considerable interference over relatively long distances.

MIMO products create wireless networks that can reach significantly farther than current Wi-Fi networks and still provide high data throughputs. In some cases, wireless networks using MIMO technology can reach over 300 feet and still send and receive data at 30mbps.

However, Pre-N products offer higher throughputs at the outer edges of its range, according to reviewers.


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Its a good story.. heres a little more..
I applaud the author for doing a lot of research on this issue. As someone implementing this in the buisness world, and using all of these technologies, plus others.. there is a lot more complexity to these devices as well as their ramifications.

One thing we need to stress as technology people is security in these wireless devices. Most people are implementing these devices with little or worse yet no security only to have problems with legal, sarbanes-oxley or HIPPA later on down the road.

In addition, the standards and naming can be a little confusing. What is being referred to in the article as 108MB Pre-N is not really pre-N, it is tagged as Super-G. The new Pre-N / N proposed standards are supposed to deliver (And ill treat this supposed as if a Microsoft representative said it if you know what i mean..) almost 1G of data bandwidth shared between all users on the Access point at the core and no less than 500MB of combined data at the fringe points. And oh yeah.. the fringe point is supposed to be almost a 1/4 mile in legnth.

When/If Pre-N/N ever really becomes a commonplace the need for higher security and responsibility becomes even that much more. Deployment of these devices without planning, security and site surveys opens persons and companies up to great liability. Dont believe me.. you will when homeland security comes knocking at your door one day for something your neighbor 3 doors down did on your internet connection.

Just a few thoughts.. but its nice to see something about wireless published where the author did their homework instead of spewing market press by some vendor.

Thanks for letting me give my 2 cents!

Be Well..

"We can never see past the choices we don't understand." - You should know who said this and why.
Posted by (55 comments )
Reply Link Flag
802.11b has lower bandwidth and shorter range compared with other types of
802.11b has longer range in my experiences and in theory.
Posted by Yo-Min, Chu (2 comments )
Reply Link Flag
depends on the manufacturer
In theory, yes - in my experience, definitely not.
My new noname chinese .g+ cable router + access point(108 speed in theory) has a much better range (and it is fast)than my older Linksys .b thingie...
Posted by googey10 (27 comments )
Link Flag

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