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Wireless Options20.1 BluetoothOne of these relatively new wireless standards (see the introduction to thischapter) is called Bluetooth wireless technology 1 . It is concerned with shortrangewireless as an alternative to a cable. The Bluetooth-Standard was createdby the Bluetooth Special Interest Group (SIG). The Bluetooth SIG consistsof more than 2000 member companies with tens of thousands of employeesworldwide.The task description of the Bluetooth SIG is as follows:Develop, publish and promote the preferred short-range wireless specificationfor connecting mobile products, and to administer a qualification programthat fosters interoperability for a positive user experience. The Bluetooth wirelesstechnology is an open platform.The Bluetooth standard defines three power classes. These are differentiatedby the transmitting power of the device and thus the achievable range. Devicesof the highest power class (Class 1) use a maximum transmitting powerof 100 mW and can attain - with an unobstructed line of sight access to communicationspartners - a range up to 100 metres. Bluetooth devices in powerclass 2 and 3 (Class 2, Class 3) use much less energy because of their lowertransmitting power of 2.5 and 1 mW. They attain under the same conditionsa range of 20 and 10 metres, respectively.Bluetooth devices transmit in the 2.4 GHz ISM band (Industrial ScientificMedical band). The transmission data rate is 1 megabit per second(1 Mbit/s), much slower than the rates with WLAN, see section 20.2, WirelessLAN (WLAN).1.named after the Viking King Harald Blåtand, nickname "Bluetooth", whoallowed the christianisation of large parts of Scandinavia in the 10thcentury.92Documentation