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Logitech Cordless Presenter

Posted: October 26th, 2002
Written by: Justin "The Sheriff" Woods

Bluetooth Technology Overview

Bluetooth is a relatively new technology, and has been gaining support from almost every hardware manufacturer out there. Named after the Danish Viking King, Harald Blåtand. He is known for uniting Norway and Denmark. It's a fitting homage to name a technology that unites peripherals after him. It's rumored that he got the name "Bluetooth" (translated from Blåtand) because his teeth were stained from eating his favorite fruit, blueberries.

In short, Blue tooth is a networking technology, which uses the 2.4 ghz radio band, because it's unlicensed, which means you don't need a permit to use it. The hardware operates in a mode known as frequency hopping, which requires the continuous shifting between the 79 available frequencies on the 2.40 ghz band. Bluetooth can hop up to 1600 times per second in noisy conditions.

Hardware equipped with Bluetooth connectivity create small networks called "piconets", which can have up to 8 devices communicating in a 10 meter radius. If you have multiple piconets in a small area, it's known as a scatternet. Each piconet will maintain it's connection without interruption from the others, because the way they frequency hop is random, but agreed upon; meaning each piconet will have its own series of hops. The piconet itself is made up of a master, and slaves. Each piconet has 1 master to every 7 slaves. Up to 10 piconets have been combined in this way.

What I have provided here is a very short, simple explanation of the basics of Bluetooth. If you would like more information, feel free to take a look at the following websites:

Of course, I could write a novel about this, but I don't want to get too far off track from the real subject of this review, which is of course, the presenter. So now that you have a basic understanding of Bluetooth, let's move on the rest of the review.

Next Page: The Presenter

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