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infrared data association (IrDA)

Infrared Data Association (IrDA) is a technology for wireless, point-to-point transmission of data based on infrared light. The concept was developed in the 1990s and named after the IrDA Association. IrDA is based on the modulation of infrared light with wavelengths between 850 nm and 900 nm, which is generated with infrared LEDs.

In the early years, the IrDA concept had a transmission speed of 115 kbit/s with Serial Infrared( SIR), later the transmission speed was increased to 4 Mbit/s with Fast Infrared ( FIR), to 16 Mbit/s with Very Fast Infrared ( VFIR), to 96 Mbit/s with Ultra Fast Infrared ( UFIR) and to 512 Mbit/s or 1 Gbit/s with Giga-Infrared( GIR). In addition to high data rate data transmission, there is also Consumer Infrared( CIR), which is used for audio and TV equipment, but is not compatible with the two previously mentioned modes.

Data exchange under IrDA

Conceptually, data exchange between devices - usually cell phones, handheld PCs, PDAs and laptops - takes place via the infrared light link. The distances between the sending and receiving stations are limited to only a few meters. In addition, both devices must have line-of-sight contact and the positioning of both devices must be relatively exact, since an angle of incidence of more than 30 degrees already results in faulty transmission.

Protocol layers of IrDA

Protocol layers of IrDA

The IrDA layer model is supported by a protocol stack that includes a mandatory and an optional protocol set. The general protocol set consists of the IrDA Physical Layer( IrPHY), IrDA Link Access Protocol( IrLAP), IrDA Link Management Protocol( IrLMP), and Information Access Service( IAS).

Optional IrDA protocols

Optional protocols available include:

The Tiny TP, IrDA Tiny Transport Protocol, which supports flow control on the IrLMP link with optional segmentation and reassembly. The IrCOMM, IrDA Communications, provides parallel and serial port emulation for communications applications, printers and modems. IrOBEX , IrDA Object Exchange, supports object exchange services similar to HTTP. IrDA Lite supports methods to reduce the size of IrDA code while maintaining compatibility of the full implementation. IrTran-P, IrDA Transport Protocol, is a protocol for capturing and exchanging images from digital cameras. IrMC, IrDA Mobile Communication, forms the specification for mobile exchange of information in mobile telephony and other mobile applications such as phone book, calendar and message data. IrLAN, IrDA Local Area Network, describes a protocol for wireless connection to local networks using infrared technology.

Englisch: infrared data association - IrDA
Updated at: 09.11.2013
#Words: 390
Links: transmission, data, infrared (IR), light, modulation
Translations: DE

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