Blue tooth is an industrial specification for wireless personal area
networks (PANs). Blue tooth provides a way to connect and exchange information
between devices such as
mobile phones, laptops, PCs, printers,
digital cameras,
and
video game consoles over a secure, globally unlicensed short-range radio
frequency. The Blue tooth specifications are developed and licensed by the Blue tooth
Special Interest Group. Bluetooth is a standard and communications protocol
primarily designed for low power consumption, with a short range
(power-class-dependent: 1 meter, 10 meters, 100 meters)based on low-cost transceiver
microchips in each device.
Blue tooth enables these devices to communicate with each other when they are
in range. The devices use a radio communications system, so they do not have to
be in line of sight of each other, and can even be in other rooms, as long as
the received transmission is powerful enough. It has to be noted that in most
cases the effective range of class 2 devices is extended if they connect to a
class 1 transceiver, compared to pure class 2 networks. This is accomplished by
higher sensitivity and transmitter power of the Class 1 device. The higher
transmitter power of Class 1 device allows higher power to be received by the
Class 2 device. Furthermore, higher sensitivity of Class 1 device allows
reception of much lower transmitted power of the Class 2 devices. Thus,
allowing operation of Class 2 devices at much higher distances. Devices that
use a power amplifier on the transmit, have improved receive sensitivity, and
highly optimized antennas are available that routinely achieve ranges of 1km
within the Blue tooth Class 1 standard.
More abstracts about the Blue Tooth Technology