4 GHz (5 GHz for 802.11a/n) RF 2.4 GHz
Transmission
power
40??“500 mW/Sr 100 mW 10??“100 mW
Maximum data
rate
9600 bps??“16 Mbps (very
rare)
11 Mbps (54 Mbps for 802.11a,
802.11g)
3 Mbps
Range 1 m 100 m 10??“100 m
Supported
devices
2 Connects through an access point 8 (active), 200
(passive)
Voice channels No No Yes
Addressing 32-bit physical ID 48-bit MAC 48-bit MAC
What Is Bluetooth Wireless Technology? 3
Because the ISM frequency band is available for general use by ISM
applications, several other devices (e.g., WLAN, cordless phones,
microwave ovens) operate in this band. Bluetooth wireless technology
is designed to be very robust in the face of interference from other
devices.
1.2.1 History of Bluetooth Wireless Technology
Bluetooth communications originated in 1994, when Ericsson began a
study to find alternatives to connecting mobile phones to its accessories.
The engineers looked at a low-power and low-cost radio interface to
eliminate cables between the devices. However, the engineers also
realized that for the technology to be successful, it had to be an open
standard, not a proprietary one. In early 1998, Ericsson joined Intel,
International Business Machines (IBM), Nokia, and Toshiba and formed
the Bluetooth Special Interest Group (SIG) to focus on developing an
open specification for Bluetooth wireless technology.
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