Bluetooth Technology
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Bluetooth Technology Explained
Cellular phone technology has come a long way since its humble beginnings in the early 1980s, and one of the hottest new trends in cell phones is the use of Bluetooth. A little lost in the mix and not really sure why everyone is going bananas over this wireless data transfer innovation? Then keep reading to find out -- in layman's terms -- just what Bluetooth is all about.
What is Bluetooth?
Bluetooth isn't limited to just mobile phones. It is being implemented in everything from personal digital assistants (PDAs) to full-on laptop computers. Bluetooth is a wireless technology that allows for small amounts of data to be transfered within a short range. More technically speaking, it is an industrial specification for wireless personal area networks (PANs).
Not unlike Wi-Fi (802.11), Bluetooth is meant to be used within a specified range and is sometimes referred to as IEEE 802.15.1. Virtually anything can be sent over Bluetooth, but one of the most common applications of the technology -- for cell phones, specifically -- is the use of wireless handsfree headsets. Other uses include sharing picture and audio files between mobile handsets without having to make use of a pricey data plan.
A prominent competing technology is IrDA or "infrared data association", but IrDA typically requires line of sight, whereas Bluetooth can theoretically work through walls.
Origin of the Name
While many other techie terms sound awfully techie, Bluetooth is something a little different. Its name comes from a 10th century Danish king -- King Harald Bluetooth (sometimes spelled Blatand, and also known as Harold I of Denmark) -- and thus the universally accepted Bluetooth logo is a combination of the Nordic runes for the letters H and B. Bluetooth was originally just the codename for the developing technology, but it became so widely used (instead of 802.15.1) that everyone started referring to it by its codename.
Specifications
- 1.0 and 1.0B: Where it all started. The first versions of Bluetooth -- 1.0 and 1.0B -- were quite glitchy and there were many issues pairing different devices.
- 1.1: Several of the problems presented by 1.0 and 1.0B were addressed with the release of Bluetooth 1.1. They also added support for what is known as "non-encrypted channels."
- 1.2: Backwards compatible with BT 1.1, Bluetooth 1.2 allowed for faster data transmission speeds and improved resistance to radio frequency interference.
- 2.0: The newest version of Bluetooth is 2.0. Devices sporting this version are backwards compatible with 1.1 and 1.2 units. Data transfers are even faster, up to 10 times faster, and power consumption is significantly lower.
Classes
There are three classes of Bluetooth. Increased range comes at the cost of increased power usage.
- Class 1: Maximum range of 100 meters, maximum permitted power of 100 mW.
- Class 2: Maximum range of 10 meters, maximum permitted power of 2.5 mW.
- Class 3: Maximum range of 1 meter, maximum permitted power of 1 mW.
Profiles
- Handsfree: HID, or Hands Free Profile, was designed to be used in automobiles so that people could chat on their cell phones without actually holding the phone to their ears.
- Headset: HSP, or Head Set Profile, is probably the profile that you are most familiar with, as it is the one used for all those Bluetooth headsets you see on the market from such companies as Motorola
- A2DP: Now quite prevalent in musicphones, A2DP or "Advanced Audio Distribution Profile" allows for audio to be played back in full stereo through compatible Bluetooth headphones.
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