The numerous wires connecting of the modern engineering have entangled for a long time already into the world not virtual, but quite a real network. Therefore more and more popular there is usage of wireless connections. One of them allows linking pair of devices on meter distance; by means of others it is possible to create the whole local area networks.
IR-communication:
In the beginning of the last decade of the last century for wireless connections of home devices have started to use infra-red (IR) link. In 1993 Infrared Data Association worked out the common standard of Infrared Direct Access has been created.
IR-port looks as a window from dark (or dark red) transparent plastic behind which there is a light-emitting diode and the photo diode. The digital signal after strengthening is routed on a light-emitting diode of one device and dispatched in the form of infra-red radiation on the photo diode of other device. The transfer rate makes from 2,4 Kbit/c to 115 Kbit/c, and in a case with computer IR-ports can reach 4 Mbit/c.
With the help of IR-port it is possible to link only two devices on distance no more than 1 m, thus between them there should be no barriers. The corner, under which devices are under the ratio to each other, should not exceed 60 degrees. However advantage of IR-communication is in that it is very cheap. Equipment of IR-port some devices cost less than $1.
Therefore IR-ports are built in many notebooks, a handheld computer, mobile phones and other instruments. According to association of IrDA, in 2003 already more than 0,5 billions devices in the world had IR-port. Besides, IrDA consumes not enough energy, does not bring interferences in operation of radio equipment and does not put harm to health.
Bluetooth:
The following technology of wireless connection has been created by union Bluetooth (“the Blue tooth”). The organization (and then the technology) has received such unusual name in honor of the king of Denmark Harold II living in Х century and nicknamed the Blue Tooth. It has become famous as the combiner of the Danish earths. In the same way the Bluetooth-technology helps to connect among themselves personal computers, mobile phones, a handheld computer and every possible household appliance.
Bluetooth differs from IrDA that it uses radio-waves. The Bluetooth-device contains the small chip — the transceiver working in a range of 2,4-2,48 GHz. Connection of two Bluetooth-devices allows transfer the data on speeds from 420 to 720 Kbit/c to distance to 10 m. of All Bluetooth can to link to eight devices, except that, this standard possesses a high noise stability.
At the same time heavy use of Bluetooth carries on to sharp increase in power consumption for transportable devices.
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