Bluetooth Technical Operations
By Lee MacRae
Bluetooth is a high speed, low powered wireless link technology that's designed to connect phones or other portable equipment together with little to no work required by the user. Unlike infrared, Bluetooth doesn't require line of site positioning to work.
Current prototype circuits are contained on a board that is 0.9 cm square, with a much smaller circuit board being developed.
When one Bluetooth device comes in contact with another, they will automatically exchange addresses and details of capability. Then, they can establish a 1 MB link with security that they will use as required. The protocols involved with handle both data and voice, with a very flexible topography.
The technology achieves its goal by embedding tiny, non expensive short range tranceivers into the devices available today. The radio operates on the 2.45 GHz frequency band, and supports up to 721 KBps, along with three voice channels.
Each devices offers a unique 48 bit address from the IEEE 802 standard, with the connections being point to point or multipoint. The max range is 10 meters, although it can be extended to 100 meters by increasing the power. The devices are also protected from radio interference by changing their frequencies, also known as frequency hopping.
What's important, is the fact that Bluetooth devices won't drain battery life. The specification targets power consumption of the device, limiting the drain on the battery. The radio chip will consume only 0.3mA in stand by mode, which is less than 5% of the power that standard phones use.
Bluetooth will also guarantee security at the bit level. The authentification is controlled by the user via a 128 bit key. The radio signals can be coded with anything up to 128 bit. With the frequency hopping, Bluetooth is already very hard to listen into.
The baseband protocol is a combination of both circuit and packet switches. Slots can be reserved for synchronous packets as well. Each packet will be transmitted in a different hop frequency. Normally, a packet covers a single slot although it can be extended to cover up to five slots.
Bluetooth can also support data channels of up to three simultaneous voice channels. Therefore, it's possible to transfer the data while you talk at the same time. Each individual voice channel will support 64 KB.
From a technical standpoint, Bluetooth is very different indeed. It's the best wireless method in the world, surpassing even infrared. For communication on the go, Bluetooth is indeed very hard to compete with.
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Bluetooth Reviews And More
The world is going wireless. Whether it's Wi-Fi or WiMax, or Bluetooth, wires are going the way of Britney Spear's career. ArtDio, after dabbling in wireless audio last year, has embraced this trend whole-heartedly, adding a trio of Bluetooth-enabled speaker sets to its line up. The BT-132 is a portable stereo Bluetooth set up that can be powered by either 4 AA batteries or an AC adapter. The 132 also includes a built-in microphone so that when a call comes in on your paired mobile phone, the music stops, allowing you to use the BT-132 as a speaker phone.
Get more info at Bluetooth mouse.
Linux Bluetooth Remote Control (LBRC) is a remote control program that allows a Linux computer to be controlled by a J2ME device via Bluetooth. It is divided into a server part that runs on the computer and reacts to input events and a client part that runs on the J2ME device. The J2ME client sends the device's keycodes, which are translated to keystrokes, mouse movements, mouse clicks, or other input events on the controlled computer.
To learn more go to Bluetooth car kits.
The Model 4355 Bluetooth transceiver plugs into the dock connector of an iPod or iPhone. The transceiver can send the iPod's music or other audio out via a Class 2 Bluetooth wireless connection to Zoom's new Model 4380 headphones/headset, Zoom's model 4360 stereo receiver, and other Bluetooth-enabled stereo playback devices. Unlike competing Bluetooth transmitters, the model 4355 provides volume control from the iPod or iPhone. Plugged into an iPod, the miniature transceiver becomes a natural extension of the iPod.
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The Bluetooth News Section
iPod Bluetooth
Thu, 06 Jan 2005 07:23:00 EST
naviPlay wireless stereo headphone adapter with integrated remote control is a bundle of untethered freedom.
AirWave Wireless Announces Investment Protection Program for Trapeze Customers
Tue, 10 Jun 2008 00:00:00 EST
AirWave Wireless announced a new investment protection program to provide stable, flexible management for Trapeze Wireless customers, including customers of Trapeze's OEM partners Nortel, 3Com and Enterasys. The new program extends preferential pricing to existing Trapeze customers who transition to the AirWave Wireless Management Suite 6, the industry's leading multi-vendor wireless network management software.
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