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Wireless LANs and Linux
Patrick Mullen writes "Wireless LAN products are hitting everywhere these days. I've just an overview of these technologies, the products out there, and how they look on Linux." I'm a huge fan of the wireless stuff (we've been doing wireless lans for years now... if only we had wireless electricity ;) And check out
Absolute Value Software: Mark's working on a simple router/gateway (that runs Linux) and looks extremely promising.
802.11, with the boost of Apple's AirPort, has started really taking off (pun intended). USENIX conferences have had Wavelan or Aironet (now Cisco) gear available for a couple years now, and it's wildly popular; now, Aerzone (which used to be Laptop Lane) has partnered with Delta, and they are starting to offer 802.11 service in airports (the ones with airplanes, not the plastic flying saucers). I think American has a deal with another company, but I can't remember the name of that one.
The nice thing, of course, is that since it's wireless, you don't necessarily need to be in the lounge to get a signal; so next time you're in the vicinity of a Crown Room or Admiral's Club, see if you have any signal.
For that matter, just see if you see any wireless LANs around home! When we set ours up, it turned out that a couple companies across the street showed up in the choice of networks pop-up menu....
The 2.4ghz band is available in most countries around the world. Two exception, until recently, were France and Japan, but both have agreed to clear the band (I think it was the military in France that was on it).
One of the things that is a real stumbling block is that many of the drivers don't work properly or at all on an SMP machine. If you are like me and have a dual CPU box, wireless networking is very problematical. Another thing to watch out for is that while the Lucent drivers work fine in PCMIA mode, they fail if you try to use a Lucent card in the PCI slot adapter they sell.
Ya know, lately I have been having these feelings of uncertainty about the potential health effects of the radiation our bodies are forced to absorb every day. Back in the 1920's-1930's Television was a dream and radio was, what, 10-100W transmitters? Not much ambient radiation. Flash to now. We have local TV, radio transmitters, cell phones, bluetooth, wireless LANs, Microwave transmitters, and satellite. Not to mention CRT screens, television screens, CB radios.... You get the idea. How is all this affecting us? Are the cancer rates any higher? I know teenagers appear dumber, but that's just observation. Are we going to be forced, some day in the future, to set up RF free zones for sensitive people?
Dirty Pirate Hooker
There are released, supported Wavelan now ORiNOCO card does have drivers for Linux.
I quote from the Lucent produce listing:
"The ORiNOCO PC card is compatible with Windows® 95/98/2000/CE/NT (NDIS Miniport driver), Apple® Mac OS 7.5.2 and higher, Novell Client 3.x & 4.x, and Linux (kernel versions 2.0.x to 2.2.x) for Intel processors."
Seems quite a bit broader than this article's "Windows 95/98/NT/2000"...
Just a few corrections on your post.
;-)>
802.11 specifies three PHY layers: Direct Sequence (DSSS), Frequency Hopping (FHSS), and Infrared (IR). DSSS and FHSS both run at 1Mbps and 2Mbps (depending on signal strength.) I believe that IR also runs at 2Mbps, but I've never actually seen one.
802.11a is what you call 802.nextgen. It uses an orthogonal frequency domain multiplexing (OFDM) to deliver from 6Mbps to 54Mbps in the 5.0GHz N-UNII frequencies.
802.11b is High Rate DSSS physical layer (HR/DSSS). It is an extension to DSSS which adds 5.5Mbps and 11Mbps data rates.
There is no such thing as "802.11b - 11Mb Frequency Hopping". Only DSSS has been extended to 11Mbps.
Source: IEEE 802.11 Handbook: A Designer's Companion By Bob O'Hara and Al Petrick.
Wireless Electricity has been around, in theory, or a while.
Of course, Nikola Tesla was way before his time.
"What's so special about Wireless LAN's as opposed to normal (Wirefull?) LAN's?
I would guess the lack of wires?
Dirty Pirate Hooker
Gosh, for a savings of a few dollars, I can have 1/10th the speed, *AND* it only works on Windows and Mac?
Sign me up!!!
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My understanding is the Cybiko has a very restrictive policy regarding use of its SDK. Pretty much everything you do becomes their property, to be marketed through them. *Not* open source, by any means.
Note that the 14 dB antenna isn't an omni. You don't get 14 dB from an onmi. Gain is at the expense of concentrating the energy in one direction or at least one plane.
Bruce
Bruce Perens.
cya
Ethelred
Everyone wants to be Ethelred. Even I want to be Ethelred.
cya
Ethelred
Everyone wants to be Ethelred. Even I want to be Ethelred.
Since beginning my postings on Slashdot I have become increasingly alarmed at the number of idiotic morons that say the most alarming, or the most uninformed things. Case in point, the above first post.
First posting is a priviledge lad. You should not go out of your way to get the first post and then waste it on something as stupid as 'boom'. You should in fact use the great opportunity to have your views known. Dare I say, even about the topic at hand? Yes, it is possible to have a first post that contains a little bit of meaning. I would even prefer a Penis Bird Guy post to this idiotic AC's retarded attempt to get attention.
Now, why does this bother me? On its own it probably wouldn't. But combine this with the fact that in every article the stupidity of the posters is only overshadowed by the obvious stupidity of the moderators and you start to understand why I am quickly losing faith in humanity. I realize that the audience (and hence the moderators) here is made up of mostly young adults and teenagers. However, if this is the youth of America in action, I can only doubt our survival in the future. Such blatant stupidity and obvious power tripping arrogance should not be tolerated or fostered. But here, not only is it tolerated, it is encouraged. Moderators are told to abuse by the 'majority rules' crowd. Don't let an opinion you disagree with get moderated up. No matter how eloquently written that opinion is. No matter how many facts the poster used to back his position. No matter how right he/she is or could be, don't let that opposing view be heard! It is strange to me that a forum based on freedom is in actuality just a place to reinforce the stupidity that has been bred into this generation. If the youth of America is represented here on Slashdot, then I don't just weep for the future, I bleed my wrists in pain and indignation at the prospects that lie ahead for us.
As Slashdot continues to attempt to drain out your indignation, please do not be afraid of having your own opinion. As Slashdot goes out of its way to indoctrinate our youth into the 'majority' mindset, as slashdot attempts in every way to completely obliterate our ability to think for ourselves, stand up for your rights. Do not be afraid to continue expressing your opinions. No matter how unpopular those opinions are, you are our hope for the future. Please remember that.
I realize this will get moderated down into oblivion quicker than any other post on the forum, but please, if you read it, remember it. Do not be afraid of your thoughts. Do not let the slashdot hordes convince you that you must wipe your mind clean of 'unpure' thoughts. Remember your mind. Remember your youth. Remember your own thoughts. And most importantly, remember to be different.
Do not be afraid of your differences with others. Embrace them! Hold onto those differences as if your life depended on it. It may be rough trying to ride through your youth this way (and I know, because I did just that), but it is worth it. As I quickly approach thirty years of age (27 and counting) I realize that I was never afraid of all the bible thumping morons that were always so 'concerned' about my differences. In fact, I usually just laughed it off when it didn't piss me off. And now, I still play that evil, 'satanic' heavy metal music. I still enjoy a good 'evil and satanic' Dungeons and Dragons game. I still enjoy a good horror story or movie. And I still play those damnable, corrupting violent video games. I still wear black tee-shirts (the ones that got me called a satanist on a daily basis by my 'peers' as a youth). And nobody is ever gonna pry that guitar out of my hands (not even my wife, but she wouldn't try).
You can do it. You can make it through your youth without becoming the zombie that the 'popular' crowd wants you to be. You don't have to be popular. You just need to be 'YOU'. And believe it or not, Slashdot is totally against the entire concept of being YOU. Slashdot is all about being a part of the 'in' crowd. Slashdot is all about being 'hip', or 'kewl' or '3l33t'. Please, even if you are naturally 3l33t (and some are), do not succumb to the urge that Slashdot places in front of you. Do not give up your differences. Allow yourself free thought. Allow yourself to voice your opinion. Allow yourself to live, as you and you alone.
Slashdot will not succeed in destroying the free-thinking minds of the individuals that make up the youth of America. Don't let it succeed. As it appears more and more to just be a 'anti-corporate' corporation in and of itself, go against the grain. Do not be afraid. The future is yours, but only if you are willing to remain you.
Yes I'm feeling philosophical today. Is that a reason to mod me down? Probably. After all, I dare to accuse Slashdot of something that isn't cool. How unpopular of me! Fuck popularity. I'd rather be able to look myself in the mirror than be a druken, drugged-up, ass-kissing, 'thank you sir may I have another' moron like the great Slashdot 'community'.
Be different. Be yourself. Don't be, 'one of them'.
Bite my yammer.
I've been looking quite a bit at the linux-wlan code which you can get from the Absolute Value systems page. Frankly, it's bloated beyond belief and in some places just plain broken (e.g. a jiffies based timeout with interrupts disabled). It has very much the look of code produced by someone being paid by the line. I'd rate its chances of getting into the standard kernel in anything like its present form as virtually nil.
That story URL was good, here's another (and I think more comprehensive), from a DC LUG meeting more than a year ago.
/linux/wireless.html
Thanks to Peter Teuben for doing this:
http://www.astro.umd.edu/~teu ben
- Serge Wroclawski
It's nice to see an article on wireless networking, but this one's a bit too trivialised. It misses information and there are a few errors:
1. Lucent cards are 11MB
2. Lucent cards have Linux support, both directly from Lucent (binary module) and as 3rd party (pcmcia-cs).
3. Samsung's Linux support is 3rd party.
They also don't mention a number of other cards (3Com have a Linux-compatible one, Compaq have a Samsung-compatible one, Elsa do one, there's the cheapo non-interoperable 2Mbit ones I've forgotten the name of, and of course there's the Apple stuff), so don't take this as a complete list by any means. Nor do they mention that the linux-wlan project is only interested in a limited number of cards. Finally, they say nothing about 802.11b base stations, which (in my experience) cause the most confusion to people when they're buying wireless stuff.
Finally, mobile IP isn't really related to wireless networks - it's a means of allowing your machine to move around a network topology, rather than a building. It's not necessary to understand or to have a mobile IP system to use wireless network cards.
Well - to start:
Bluetooth is one international standard. It works very well at VERY short range. It is not going to be a good setup for LANs - poor security, too slow, too unresponsive to change - but blows everything else away when it comes to phone earpieces, or scanner to portable printer connectivity. It also kills 802.11 devices in close proximity to it as its hop speed is so high.
802.11 is also international, and considerably better for a home LAN
802.11 - 2Mb Frequency Hopping - pretty solid, with good range. Not bad for industrial settings where end users have a telnet/3270/5250 application.
802.11b - 11Mb Direct Sequence - very solid, and very secure; signal can be at a lower level than rf interference, so can't be seen. Signal only appears when decoder with identical chipping set is used. I've had Quake 2 over a 5 mile link with directional antennas - no judder!
802.11b - 11Mb Frequency Hopping - An excellent choice for the home. Frequency hoppers are much cheaper than DS transmitters, and 11Mb gives much better throughput than 10BaseT (CSMA/CA overhead is less than half CSMA/CD)
802.nextgen - 25Mb radio, at 5GHz. Throughput - yummy, range - down a bit, unfortunately.
Cat 5 my house? No need with RF!!!
Frog51
You know a way to make 802.11b work as a LAN (ie, not just peer-to-peer) without an access point? Do tell.
Routing is a basic concept of TCP/IP networking. If you are so unfamiliar with it that you don't even know it exists, I would recommend you start here:
TCP/IP for Dummies, Fourth Edition
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The software that comes with it is Mac-only, but there is a Java application on the net that manages it. The management protocol is SNMP, so a native Linux application to manage it would be easy enough.
;)
IIRC the card inside is WaveLAN, so you might be able to use the Lucent WaveLAN tools on it.. Also, I've heard if you are interested in cracking the case you can stick a nice 14dB amplified omni antenna on it and get mega range.. I'm thinking of doing that to mine so I can get data out on the porch
Apple really nailed it on that one. No PC vendor comes close, and a comparable base station from Lucent or Cisco costs waay more..
Your Working Boy,
Via microwaves.
People have proposed oribiting solar collectors and microwaving it back to Earth or Luna.
Some problems:
-Any moisture in the atmosphere screws the method,
but that still leaves several deserts with 99% downlink.
-Beams spread out. Masers, solitons, etc. may get around this problem.
-Anything near the beam may get fried.
In 1993, before the collapse of Communism in the USSR, but in they heyday of Glasnost and Perestroika, I went on a school exchange trip to Minsk. One of our daytrips was to Minsk University, where we were shown a lab, and it was explained to us in halting English, that they were researching the "transmission of electricity without wires".
The room was dominated by two enormous steel balls, and every second a spark passed between them with a deafening "click". We recieved no further explanation.
All true.
What's the point of this story? Um... I like stories.
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The funny thing is you think you're telling me exactly the opposite of what I think, but in fact, you are agreeing with me.
By 'being different' I certainly didn't mean to be different in whatever is the most freakish way you can be. I'm different from anyone else I know. I play heavy metal guitar, yet I don't drink, don't smoke, don't do drugs, don't have tatoos, don't have peircings or any of the other things that are 'supposed' to go with it.
You have, in fact, embraced your differences. It's just that you are so comfortable with your differences that you don't even think of them as differences. That's a very healthy way to see things.
Embracing your differences isn't about 'standing out'. It's about being who you are. You don't need to be a freak to be different. Sometimes normalcy is different. It certainly is in this day and age.
Bite my yammer.
Well, that would be a savings of nearly $800-1000 (when you included 802.11b's access point and LAN cards together) and HomeRF now matches 802.11b's 11mbs. And what makes you think that either HomeRF and Bluetooth will only be Windows/Mac? My understanding is that Linux plans are in the works for both.
Lately, there have been a couple of 802.11b cards come out that are pretty cheap - check out the Linksys WPC11 , which can be found for around $120 a pop (if you can find it in stock...) and also Addtron's AWP100 card - no info on their site, but they told me it has the PrismII chipset, which is what the AbsoVal guys are working on, I believe. It, too, is around $120.
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This article does not do a good job of talking about what products are available, or comparing them.
For one, Lucent WaveLAN cards run at 11Mbps, not 2 as the article states. In addition, Lucent provides binary x86 Linux drivers on their web site.
For another, it's not really important whether or not the card's vendors provide Linux drivers. What's most important is whether or not they work under Linux. The fact is most of these cards work using pcmcia-cs.
No mention is made of the access points, which are important if you want to easily hook up to your wired LAN. Of the ones I've tested, it comes down to two: Apple and Cisco. The Apple Airport can be configured via a third party Java client which works fine under Linux. It's also dirt cheap (~$280). The downside is that it is not a high performance solution, and it can only use one encryption key. If you want performance and flexibility, buy a Cisco. It can be configured via web, telnet, and serial interfaces. All encryption is done in hardware so it is far and away the fasted 802.11b solution I've seen. Most vendors do the encryption in software, and take about a 20% performance hit with it. Which would be fine, but you pretty much have to use encryption. If you're not, you are opening up your network connection to all your neighbors.
All the other access points I've tried use Windoze-only configuration clients (3Com and Lucent). Some of them try to prevent compatability by not allowing you to set the encryption keys directly (3Com and Apple(only applies if you use Apple's software instead of the Java client))
Overall, this stuff rocks though. I have an Apple Airport at home. Combined with my DSL line, it is awesome. I can use my laptop anywhere in the house. Sit on the sofa and play games, check email in the kitchen, whatever. The 802.11b is much faster than DSL, so you don't notice a performance hit at all.
I would also recommend only buying 802.11b 11Mbps hardware if you want to use it other places. There are two coding techniqes allowed in 802.11. One is Direct Sequence Spread Spectrum (DSSS), which runs from 1Mbps to 11Mbps. The other is Frequency Hopping Spread Spectrum (FHSS) which maxes out at 2Mbps. The two are 100% incompatable. They will not communicate in any way at all (except possibly some interference.) So, if you buy cheap 2Mbps cards, there is a good chance that they are FHSS and will not work with 11Mbps DSSS equipment. Spend the extra bucks and get 802.11b equipment. You will appreciate the extra speed and compatability. If you can find 2Mbps DSSS cards, they should talk to 11Mbps equipment fine (at 2Mbps of course.)
Well, that would be a savings of nearly $800-1000 (when you included 802.11b's access point and LAN cards together) and HomeRF now matches 802.11b's 11mbs.
Why would I be so foolish as to include the access point?
As for the "now matching" speed; I define "now" as "I can go into a store and buy one". Unless every web page I've checked is mistaken, 11Mbs HomeRF doesn't meet that qualification.
My understanding is that Linux plans are in the works for both.
Neither Vincent Cerf, Al Gore, nor God herself can transmit packets over a plan; it requires actual products with actual drivers.
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Will that work point-to-multipoint (which is what I meant by a proper LAN)? So if I've got three or four wireless devices, I can serve them all simultaneously off a single 802.11b card in peer-to-peer mode with no need for an access point?
You know a way to make 802.11b work as a LAN (ie, not just peer-to-peer) without an access point? Do tell.
Would this really work? I thought that the magnetic field was more-or-less also fixed to the Earth's rotation (ignoring its ordinary non-rotationally related fluctuations)? Wouldn't coils attached to the Earth be stationary relative to the Earth's magnetic field?
These are the advantages of NOT running in ad-hoc mode:
a) Gateway/access point can act as a repeater
b) With multiple gateways, you can hop in a cellular fashion between access points as you roam.
Currently, all Linux drivers will only run the card in ad-hoc mode, with the exception of the absolute-value.com project. (Or at least, that's what I believe the difference between the AV project and the already-in-kernel drivers is.) I recall in a discussion with some other people a while ago that you can run a card in full access-point mode, but you have to implement a full 802.11b stack in the card driver. I was then told that the only cards such a stack was implemented for were Harris PRISM chipsets. Note that the AV project listed all of their supported cards as being based on or similar to PRISM based cards.
Peer-to-peer 802.11 may be a LAN, but it's a pretty sucky LAN compared to the features you can get with the same hardware and the right driver.
retrorocket.o not found, launch anyway?
Wireless Electricity Has Been Done. And A long time ago by Tesla in 1899.
Here's The Link
"Tesla spent his remaining funds on his other inventions and culminated his efforts in a major breakthrough in 1899 at Colorado Springs by transmitting 100 million volts of high-frequency electric power wirelessly over a distance of 26 miles "
that linux is getting more and more support from the HW markets. On another note, I can see how this can be a great thing for transmeta if the prices of wireless hw drop. From what I understand, transmetta is aiming to create various linux appliances. Well, what about actuall _appliances_. Web access from the kitchen, the bathroom, and the kids play room, all utilizing wireless technology and access terminals with a small footprint. I know for one that I want to have access to various computing tools in other places than just my desk. And there is no real easy way to do alot of wiring without doing it when the building is first constructed. just a thought
"sex on tv is bad, you might fall off..."
I lost my concept of community when my community lost all concept of me.
This is something that Nikola Tesla was working on, actually. The entire theory behind the Tesla Coil was that it could transmit electricity through the air to be converted into useful power at the home. The problem was, Westinghouse dropped his support of it because it became difficult to charge people for it.
Another idea of Tesla's was the idea of using the Earth's rotation and magnetic field to generate electricity. You could set up giant coil towers that would be dragged through the magnetic field via the Earth's rotation. This could be converted and then retransmitted through Tesla Coils to power peoples homes, cars, airplanes... The possibilities of wireless power become almost endless.
My theory is not as strong as it used to be, though. Anyone else have a more thorough grounding in these ideas?
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"You spilled my egg... I needed that egg."
Didn't Benjamin Franklin tap into this using a kite, a key and a storm?
Maybe my brain fell out of calibration this morning, but I can't find what you're talking about there under 'products' or 'projects'. As far as inexpensive routers go, if someone can use one that isn't wireless, I really like my Linksys . It works great as a router/firewall and lets me connect all of my home computers to the internet via a single cable modem.
"If I have seen further than other men, it is by stepping on their glasses." - Michael Swaine
The article really only delves into what the techonology itself is, and doesn't even mention how well these devices work under Linux. There is a stunning article in the August issue of Linux Magazine that you can find here that demonstrates setting up wireless networking in your home and incorporating it into existing networks. Unfortunately, I don't think the article is featured online. If you'd like to see it and can't find a copy of the magazine, feel free to mail Linux Magazine and ask.
Interested in open source engine management for your Subaru?
yes, it seems scary. I have no idea how it works or what the risks are. I do know that I've seen it/done it dozens of times and the light bulb glows on and off. Eerie.
Anybody know how it works? I'm trying to float my laptop now, I'll let you know how it works.
HomeRF is just going to cause problems. Who needs it? Another incompatable standard running in the same frequency band which offers no advantages whatsoever. At best, it will work just as well as 802.11b. There is nothing about HomeRF vs. 802.11b which makes one cheaper than the other. Apple is pushing 802.11b access points for under $300. Is HomeRF going to be less? I doubt it.
What makes this stuff cheap is economies of scale. If the same folks that are spending all this effort competing with 802.11b just started making and selling 802.11b equipment we would all be better off. They could help grow the 802.11b market which would push prices down. But no, it's another example of companies trying to segment the market and screw the consumer to jack up their bottom line.
I am running the Airport as a bridge, with my Linux server as the DHCP server with dynamic DNS and IP masquerader. I run it this way so that I save one static IP number (otherwise I would have to give the Airport a static IP), and so that I get dynamic DNS (which the Airport doesn't provide). The laptops use the Lucent Wavelan "Gold" with the kernel Wavelan driver and the Debian PCMCIA and wireless-tools packages.
This works great for toting the laptop around the house so that I can dip onto the net while watching the baby, etc. And it's cheap, too!
Bruce
Bruce Perens.
First, peer-to-peer _is_ a LAN. Local area network, right?
But if you want it to talk to the rest of the network, look at a good article at NullDevice. Just add a wireless card to your existing Linux router....
Actually, the fact that my post got moderated up as funny pretty much proves the point I was trying to make. Slashdot is the perfect example of people being told to conform, but all the while we are supposed to believe that by conforming to 'the Slashdot way' we are in fact standing up for our individuality. It is really saddening. Really, really disheartening as well.
Bite my yammer.
Signal Ground did a review of Enterasys Networks' Wireless LAN offerings. They are 802.11b compliant (11Mbs), offer Linux drivers and the sources, and well, you can read the article for yourself.
This is supposed to be great art. So why does it look like a bunch of decapitated naked people? -- Calvin
I believe the AC that said 26 is right. I can't remember for sure, but I think that's about the time I started getting that bonus.
Bite my yammer.
Just as another datapoint, I have been running the webgear aviator 2.4 cards under linux for a year now, and they work like a champ.
I got both PCMCIA cards, complete with 2 ISA adapters, for $150 or so from buy.com.
Not the fastet throughput (around 75k bytes (not bits!) per second), but more then adequate for most applications... it is still 10 to 20 times faster then your cable modem / dsl connection.
Bill
Mathematically impossible requirements are technically not against policy.
What's so special about Wireless LAN's as opposed to normal (Wirefull?) LAN's?
What's special is when you find a good new pr0n site and you want to take the laptop to the bathroom with you!
You need wireless electricity? There are these neat things called batteries that you can put into laptops so that you can carry and run them just about anywhere for several hours without being plugged in. Ever heard of 'em? They're really neat.
--
"A witty saying proves nothing" - Voltaire
Stand under a tree in a nasty rain strom.
:-)
Of course, the problem is one of control. Will you get killed or merely sterilized?
As long as you're out of the breeding pool...
MSBPodcast.com The opinions expressed here are my own. If you don't like 'em... Think up your own stuff.
Considering how concerned folks are these days about the possible health risks of EM from cell phones, I hate to think about the idea of being exposed to thousands of watts of microwave transmissions (or whatever EM wavelength) ALL THE TIME...
Unfortunately doing this kind of power transmission makes any kind of communication impossible. Think of it as full-band signal jammer. so you've got a choice: transmit power or use radio, cellular, tv, etc. can't do both.
But like I said, this is an artificial segmentation of the market. There is no reason that you can't have "business" grade 802.11b equipment with say, hardware encryption, connectors for external antenna's, support for thousands of simultaneous clients, a high price point (like Cisco). While at the same time having "home" grade 802.11b with no external antenna provision, software encryption, and a low price point (like Apple).
It's like saying that we should have two differnet processor standards because businesses like to buy higher quality PC's than most home users. It doesn't make sense. You can make cheap x86 PC's, and you can make expensive ones. Just like you can make "business grade" 802.11b and "consumer grade" 802.11b. But don't you want your software to work in both places? Does it make sense for me to have two wireless cards for my laptop? One for home and one for work? Of course not.
Like I said, this is just Intel and some other folks trying to segment the market so that they can dominate that segement. My opinion is that rather than compete in the 802.11 segment, they want to create their own segment. The fact that this strategy offers no advantage to the consumer whatsoever is irrelevant to them.
Intel and a bunch of others are pushing HomeRF, which will be cheaper than 802.11b. And Bluetooth, which will be cheaper yet, will be able to provide point-to-point and point-to-multimpoint wireless data at 1Mbs, although initially its functionality as a full LAN will be pretty limited (no more than 8 devices per piconet, for example)