Today's pcs bluetooth ArticleWhat is Bluetooth?
Bluetooth technology specifies a two-way, short-range radio link that enables communication between PCs, mobile phones, PDAs, and other computing, electronic, and home theatre equipment. With Bluetooth, you can easily synchronize contact or calendar data between a PDA and laptop, talk on a hands-free phone, or print without cables. It is a cable replacement technology like infrared, but offers many advantages over infrared.
The Bluetooth specification focuses on keeping costs low, power consumption minimal, and the size small. Its low power consumption means it can be used in battery-powered devices. Bluetooth offers faster data rates and greater transmission distances compared with infrared and there are no line-of-site restrictions. It operates at the 2.4 GHz radio frequency, ensuring worldwide operability.
History
Bluetooth is named after a 10th century Danish king, Harald Blatand (Harld Bluetooth) who was known for uniting warring groups in current-day Norway, Sweden, and Denmark. It was originally developed by Ericsson, but is now managed by the Bluetooth Special Interest Group (SIG).
The Bluetooth SIG is an industry group with members from the telecommunications, computing, and chip manufacturing industries. To date over 2000 companies are members. The Bluetooth SIG oversees a qualification program to ensure compliance with the standard and interoperability with other Bluetooth devices. Any device bearing the Bluetooth logo has successfully completed interoperability testing.
Technical Details
Speed: The gross data rate supported by Bluetooth is 1 Mbps. Actual data rates are 432 kbps for full-duplex and 721 kbps for asymmetric transmission.
Frequency: Bluetooth uses the unlicensed ISM (Industrial, Scientific, and Medical) band at 2.4 GHz. In most countries, this band is available. In a few countries it is reserved for military use, but even these countries are moving to make the band available for general use. Because Bluetooth shares the same frequency range as 802.11b WLAN products, these two technologies cannot operate in the same space under some conditions.
Security: Bluetooth is designed to be as secure as wire using authentication and 128-bit encryption. Applications can also build their own security on top of the Bluetooth connection.
Transmission distance: Bluetooth?s typical range is up to 10m. The range depends on the radio power class used. A class 2 radio has a typical range of 10m. More powerful classes support longer ranges and have higher output powers. Most devices use a class 2 radio and mobile devices, like mobile phones, where low power consumption is crucial, can only use a class 2 radio.
Architecture: With Bluetooth, up to 8 devices can be connected simultaneously. A piconet is the term for a collection of Bluetooth devices connected in an ad hoc fashion. All devices are peer units, but one device acts as a master and the other slaves for the duration of the piconet connection. Each piconet can support up to 3 full-duplex voice devices. Within a 10m area, there can be up to 10 piconets.
Applications
Bluetooth is becoming the preferred wireless technology in the WPAN (Wireless Personal Area Network). Personal applications include:
- Users can connect PCs to transfer files.
- Workers can collaborate on the same document using Microsoft NetMeeting.
- Users can connect to a printer without cables.
- Users can synchronize data between a handheld PDA and laptop.
- Users can listen to music via a wireless headset.
- Users can talk on their mobile phone with a wireless headset.
- Users can connect their laptops to the internet using their mobile phone?s GPRS or UMTS network.
A synopsis on pcs bluetooth .LG CG300 Fitted Leather Case with Belt Clip
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Recommended pcs bluetooth ItemsBlueAnt Wireless Interphone Bluetooth HF - 093747
BlueAnt Wireless Interphone Bluetooth HF - 093747
> Wireless headset for your Bluetooth enabled cell phone at a
range of up to 33 feet (10 metres)
> Bike-to-bike Intercom* for rider & passenger or two separate
bikes up to 490 feet (150 metres)
> World class Digital Signal Processor (DSP) for noise and
echo reduction
> Excellent performance at speeds of up to 80mph (130 Km/h)
> Microphone incorporates anti-noise and anti-wind feature
> All weather, water resistant including heavy rain
> Large multi-function button for easy use with gloves on
> Full duplex
> Automatic volume adjustment depending on speed induced
environmental noise
> Configurable with Bluetooth Headset compatible GPS devices
> Easily mounts to all full faced and open faced helmets
> 2 clip mounts included - Clamp mount and Adhesive
> Voice answer, voice dialing & redial
> Up to 10 hours talk-time or 700 hours standby
> 2 year replacement warranty
Customer Review: Well Thought Out - Excellent Performance
My wife and I both ride and could never afford the expensive communication devices such as the chatter box. So, I happened to read a review about these things and ran into a nice one that talked about the blue ant. Everything they said in the review was correct, these things really work well. For one, my wife was in the house and thought I'd test this Bluetooth feature, and I walked up the street to see how far I could get before it crashed and lost the signal due to loss of line-of-sight. I didn't expect to get past my driveway (in my pajamas) and before you know it I was out in front of my neighbors house and started to loose it. I knew right then what I had was a winner, it was working and working great! Next day we tested the bluetooth out on the road and we could get about 500 meters in distance just using the blue tooth, not the cell phone. If you need to communicate with more than just the two, just use the cell phones. You can use this with snow gloves on your hands, one handed operation usage. Another nice feature is the fact you don't have to talk like a walkie-talkie, it's bi-directional, and both can talk at once like a telephone, it's very easy to install.
Some may say, hey, who wants to talk to your wife of almost 10 years anyway, that's what rest stops are for, me, I would, since I love her but here's the thing. You don't have to have it on all the time. It has about 700+ hours of standby, and 5 hours of talk-time. If you want to talk and it is on standby just press the button for 3 seconds and it hails the other party, they don't even have to press anything, you are connected. I cannot say enough good things about this little device and it comes highly recommended. The cell phone feature works just as any other Bluetooth device works, which I don't recommend while driving the bike. Someone calls, just press the button and it answers the call. Dial out and talk with someone on the road, they would have a hard time believing you are on a motorcycle talking to them on the phone.
You will not be disappointed in this product.
Customer Review: Middle of the road headset
I also have the Cardo ScalaRider Bluetooth Headset. This headset is good if you ride two up or are always riding with a specific buddy. It is limited to two people. You cannot have three people communicating at once. For what it does it is a good headset however, if you are just looking for a Bluetooth headset to use with your cell phone I would recommend the Cardo.
The foam cover on this particular headset is cheap and really doesn't do a good job. At higher speeds I can constantly hear wind noise from the microphone which is very annoying, and by the way I wear a full face helmet and the bike has a shield. Pairing with the other headset can be a hit or miss item. It is slightly tricky and can be annoying after a while.
HP Bluetooth Mobile Laser Mouse (GK859AA#ABA)
HP Bluetooth Mobile Laser Mouse (GK859AA#ABA)
What's in the box? Mouse
Two fashion covers
Two AA batteries
Travel pouch
Quick start card
Software and user guide
Warranty card.
Manufacturer: HP
Part: 459519-001.
Spare: 455916-001, 451485-001.
Customer Review: not bad, but very "touchy"
I'm pretty new to using bluetooth devices, and my first experience was a bad one (the dreadful Targus mouse). Undeterred, I returned that mouse and got this one instead. I'm happy to say that unlike the targus mouse, this one actually works reliably.
However, after using it for a couple of weeks, I still feel it is far from ideal, and I'm not really sold on this as being my "main mouse" for my laptop.
The first problem with it is the setup. You are supposed to be able to just load in the dvd, and follow the instructions. Um, not quite. I'm using windows vista, and I have firefox set up to be my default browser. Unfortunately, the setup for this mouse is based on html, and it doesn't like firefox. Ooops. So I had to manually bring up internet explorer, load their setup utility, and run it. Not a big deal, but it was a hassle having to diagnose the problem. Once I did get the installer to run, setup was easy.
The second main gripe is the reliability. As I said, I've been using it for about two weeks, and already I've had to re-install it. After the first week it just stopped working, and I had to de-install it and re-install it to get it to work properly. *shrug* no idea why, but what a pain.
The third, and probably most important thing I dislike about this mouse is just how it works when you are using it. It is far to "twitchy" for my liking. Since I use it with my laptop, I find myself using it in all kinds of different conditions. On the couch, at the table, in the office and so forth, and often not at a proper computer desk type of setup. What I've found is that the mouse is very picky about the type of surface you use it on. If you don't have a really nice large flat surface, the mouse works very poorly. It becomes almost impossible to use. The other corded optical mice that I've worked with are MUCH more tolerant about this. The other thing is that even if you do take some care to setup a nice mouse surface, the sensitivity of the mouse is too much for me. It is usable, but just barely, and it is pretty frustrating.
All in all, I'm happy that the mouse works (I don't take that for granted anymore) and I like the idea of having a cordless mouse where I don't need a usb adapter or anything to use it. The mouse is also a good size, comfortable in your hand, and so forth. But on the downside it is real "twitchy" and I'm less than thrilled about having to re-pair it to the computer after the initial install. It seems to me like this bluetooth mechanism may be more trouble than it is worth.
Bluetooth Application Programming with the Java APIs Essentials Edition (The Morgan Kaufmann Series in Networking) (The Morgan Kaufmann Series in Networking)
Bluetooth Application Programming with the Java APIs Essentials Edition (The Morgan Kaufmann Series in Networking) (The Morgan Kaufmann Series in Networking)
Adoption of Bluetooth wireless technology has become ubiquitous in the last few years. One of the biggest steps forward is the standardization of Java APIs for Bluetooth wireless technology (JABWT). The latest updates to this standard is explained in detail in this book. The JABWT standard, defined by the JSR-82 Java Specification Request, supports rapid development of Bluetooth applications that are portable, secure, and highly-usable. Wireless device manufacturers have responded overwhelmingly to the JABWT specification by implementing JABWT applications in mobile phones and other personal wireless communications products.
"Bluetooth Application Programming Essentials: Programming with the Java APIs" explains in detail how to write Bluetooth applications using the Java APIs to exploit the power of both technologies. Written by the specification lead for JSR-82 and two other key participants in developing the standards of JABWT, this book provides the authoritative explanations and concrete examples needed to get started right away.
This book provides embedded Java developers with to-the-point information on the APIs in the specification with detailed programmatic examples of the APIs in use. A NEW chapter on the Push Registry definition (a new feature in the 1.1 version of JSR-82) has been added. Finally, the new Essentials version of the book will update the remaining chapters to reflect changes in the latest Bluetooth spec (2.1) and the industry as a whole.
As a bonus, this edition of the book offers over 200 pages of added content on the website. This "bonus material" includes complete source code from examples in the book, the javex.bluetooth code package, the java.obex code package, an enhanced set of "Example Applications", and a tutorial on "Implementing JABWT on a Device." These code-heavy sections are actually more effective in electonic format where the application can be easily downloaded.
KEY FEATURES & BENEFITS
* By focusing only on the essentials, this concise resource enables software and hardware vendors to quickly develop Bluetooth applications for mobile devices in an increasingly competitive market.
* The updated material examines crucial programming areas (including RFCOMM, OBEX, device discovery, service discovery, and L2CAP), which allows developers to not only successfully design, but master and build Java APIs for Bluetooth Wireless Technology.
* Includes a new and valuable chapter that delineates the pivotal Push Registry feature ? a recent development that will help programmers avoid the common problem of connection collision.
* By providing real-world issues and problems involved in implementing the Java APIs specification, the book allows developers to identify with the text and encourages repeated reference.
Customer Review: Actually a 2nd edition of this book
Although it doesn't say so on the cover, this is actually a second edition of a book by the same name and the same authors. The first edition was good, but this technology moves quickly and a new edition was needed. There is plenty of practical instruction and lots of helpful figures in the book which, quite honesty, is often lacking in books published by Morgan Kaufmann - they tend to be a bit on the academic side. Plus the book has a website where there is plenty of additional code plus the javex.bluetooth and java.obex packages available for download. Also note that the old edition of the book has about two hundred more pages than this new edition. That's because much of what was previously in the book has been moved to the website, primarily code. The following is the table of contents for the new edition:
Ch 1: Introduction
Ch 2: An Overview of JABWT
Ch 3: High Level Architecture
Ch 4: RFCOMM
Ch 5: OBEX
Ch 6: Device Discovery
Ch 7: Service Discovery
Ch 8: L2CAP
Ch 9: Bluetooth and the Push Registry
Just because some of the chapter titles are the same doesn't mean the content is the same. Everything has been updated and so far it looks like a worthwhile purchase.
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Bluetooth’s Growth Beginning to Reach Maturity (CommunicationsDirect)Wed, 13 Aug 2008 16:52:02 GMT
SCOTTSDALE, Ariz. -- Bluetooth seems to have reached a maturation period with growth rates that, while strong, do not match the growth of the recent past, reports In-Stat. The Bluetooth chip market should benefit as new standards, such as Low-energy and High-speed Bluetooth, are expected to be introduced into devices beginning in...
bluetooth usb
, even though it is meant to be wireless and hands free.
