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Unlike radio-frequency (RF) wireless links, IR wireless cannot passthrough walls.Therefore, IR communications or control is generally not possible between different rooms in a house, or between different houses in a neighborhood (unless they have facing windows).This might seem like a disadvantage, but IR wireless is more private than RF wireless.Some IR wireless schemes offer a level of securitycomparable to that of hard-wired systems.IR wireless is the use of wireless technology in devices or systems that convey data through infrared (IR) radiation.Infrared is electromagnetic energy at a wavelength or wavelengths somewhat longer than those of red light.The hardware is similar, and the two forms of energy behave in much the same way. This type of system can function when the sourceand destination are not directly visible to each other. The box does not have to be pointed directly at the set,although the box must be in the same room as the set, or just outside the room with thedoor open.IR wireless technology is used in intrusion detectors; home-entertainment control units; robot control systems; medium-range, line-of-sight laser communications; cordless microphones, headsets, modems, and printers and other peripherals.
However, extensions to infrared technology supported more than two computers and semi-permanent networks. It is necessary to place two infrared devices within a few feet of each other when networking them.
Infrared was replaced in modern computers by the much faster Bluetooth and Wi-Fi technologies.
Computer infrared network adapters both transmit and receive data through ports on the rear or side of a device.
Infrared adapters were installed in many laptops and personal handheld devices.
In Microsoft Windows, infrared connections were created through the same method as other local area network connections.
Wireless communication can be provided for communicating via an infrared transmitter, cellular phone or data packet radio whereby E-mail, faxes and voice messages can be downloaded.