Aggregating air: Toward optimizing wireless
Tolly on Technology
By
Kevin Tolly
,
Network World
, 04/14/2003
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While we are barely into the second quarter of the year, it is already reasonable to label 2003 the year of enterprise wireless. Aruba, Trapeze - and now Engim - are taking a distinctly enterprise look at harnessing wildly popular wireless. For its part, Engim is focusing on the most
constrained resource: the thin air itself.
A chipmaker coming out of stealth mode, the company says it has solved a lot of problems associated with delivering enterprise-class
performance - or "wired experience" for corporate wireless LAN (WLAN) users. Ironically, the company has solved problems that,
I'd bet, most enterprise network managers aren't aware they even have. Of course, that is part of the problem too.
The technical part of the problem is that, in a world where vendors are pushing dedicated, billion-bit-per-second desktop
connections, the ubiquitous wireless standard, IEEE 802.11b, functions more like a 10M bit/sec Ethernet hub. It provides shared rather than dedicated bandwidth, and like the bad old
days, high use by one user can translate into poor response time for other users. And that is with ideal conditions.
Interference from building materials, signal degradation caused by distance from the access point - even your colleague using
the microwave - could cause users to drop to about 1M bit/sec communication with the access point. (See a review of WLAN analyzers)
So why no howls from users? Well, in many places, deployment is in the early stages, so performance problems have not yet
manifested. As with cell phones, the benefits of mobility far outweigh problems with speed or quality. And if you complain,
your IT guy might grab your wireless network interface card and shove a cable in your face.
There is a human aspect to the problem as well. Precious few of us old-line data networkers are radio frequency experts. As
fast as you can say "Orthogonal Frequency Division Multiplexing" (OFDM), we're heading for the hills.
Today's plug-and-play wireless is about as complicated and fast-moving a technology as we've seen in a while. I always judge
complexity relative to ATM - the gold standard of complexity. 802.11 wireless seems to have it beat - simultaneously shipping
three "standard" flavors of the technology with more dot-eleven subcommittees seeming to spawn daily. And because our users
are not complaining, why dig deeper when there are so many other things to do?
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