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 Definition: The Infrared Data Association (IrDA) defines physical specifications communications protocol standards for the short-range exchange of data over infrared light, for uses such as personal area networks (PANs). IrDA is a very short-range example of free space optical communication.
IrDA interfaces are used in palmtop computers, mobile phones, and laptop computers (most laptops and phones also offer Bluetooth but it is now becoming more common for bluetooth to simply replace IrDa in new verions of products). IrDA specifications include IrPHY, IrLAP, IrLMP, IrCOMM, Tiny TP, IrOBEX, IrLAN and IrSimple.
IrDA has now produced another standard, IrFM, for Infrared financial messaging (i.e., for making payments) also known as 'Point & Pay'. For the devices to communicate via IrDA they must have a direct line of sight.
Source: Wikipedia (http://en.wikipedia.org/wiki/Infrared_Data_Association)
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