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The PowerBook computer has a directed infrared (IR) communication link connected internally to a serial port on the KeyLargo IC. When the computer is placed within range of another device with an IR interface, it can send and receive serial data. The other device may be another IR-equipped PowerBook, a desktop computer with an IR communications link, or some other device that complies with the Infrared Data Association (IrDA) standard.
Operating range is 1 meter, and the devices must be positioned with their IR ports pointed toward each other within about 15 degrees.
The IR link in the PowerBook computer supports IrDA at up to 4.0 Mbps. The IrDA modulation method complies with the IrDA physical layer standard, which can be found at ftp://www.irda.org.