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  Mobiles   Bluetooth   HomeRF/SWAP   WAP   GPRS, HSCSD   EDGE   CAMEL, IN


new bluetooth logoNamed after a 10th Century Danish king famed for uniting his kingdoms, the Bluetooth consortium has developed industry standard for the wireless connection that utilizes a short-range radio link enabling seamless interconnection between laptops, PCs, modems, PC peripherals, LAN access devices, mobile phones, pagers, PDAs, digital cameras, wireless headsets, fax machines, keyboards, joysticks and virtually any other digital device. Bluetooth facilitates both voice and data transmission. Bluetooth radio technology is provided by Ericsson, with Toshiba and IBM developing a common specification for integrating Bluetooth into mobile devices to make sure it is secure and free from interference. Intel is contributing its chip expertise and Nokia its knowledge of mobile handset software.

old bluetooth logoBluetooth has positioned itself as a point-to-point (or even point-to-multipoint) cable replacement while HomeRF is meant to be an entire home network. Bluetooth can still support up to 8 devices in a piconet (two or more Bluetooth units sharing a channel). The actual Bluetooth chip can be incorporated into a variety of devices and measures just 17x33x3mm. Bluetooth operates on a same ISM 2.4 GHz band and like HomeRF it must cope with interference from baby monitors, garage door openers, cordless phones and microwave ovens, which also use this frequency.

Bluetooth general specification:

Frequency Range 2402 - 2480 MHz
Data Rate 1 Mbps
Channel Bandwidth 1 MHz
Range Up to 10 m can be extended further
RF hopping 1600 times/s
Encryption GSM like, device ID and 0/40/64 bit key lengths
TX Output Power 20 dBm Max. (0.1W)

Read more about bluetooth:, and IEEE 802.15

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