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In the Vishay transceiver data sheets the following nomenclature is used for defining the lrDA operating modes: SIR: 2.4 kbit/s t0 115.2 kbit/s, equivalent to the basic serial infrared standard with the physical layer version lrPhy l.0 MIR 576 kbit/s t0 1152 kbit/s FIR 4 Mbit/s VFIR 16 Mbit/s MIR and FIR were implemented with lrPhy l.1, followed by lrPhy l.2, adding the SIR Low Power Standard. IrPhy l.3 extended the Low Power Option to MIR and FIR and VFIR was added with lrPhy l.4. A new version of the standard in any obsoletes the former version.