IrDA
From ThinkWiki
IrDA can be used to communicate using Infrared to other IrDA compliant devices, such as other Notebooks, PDAs and mobile phones. 
All IBM ThinkPads manufactured in the last years have integrated IrDA that can be used in one of two modes, SIR or FIR.
SIR is limited to serial datarates up to 115.2Kb/s FIR is the preferred mode of IrDA operation and operates at a bandwidth of 4 Mbps
Some very old ThinkPads only support SIR mode, or might not have IrDA support at all.
A newer VFIR standard exists, which supports speeds upto 16Mbps. However for the moment no ThinkPads support this.
Linux support
External Sources
Linux-IrDA Project (External) Linux PCMCIA Project (External) tpctl homepage (External) Linux Infrared Remote Control (External)
ThinkPad Models featuring this Technology
IrDA 1.0 (SIR - 115Kbps)
365C, 365CD, 365CS, 365CSD, 365E, 365ED, 365X, 365XD 535, 535E 560 755CD, 755CDV, 755CE, 755CSE, 755CV, 755CX 760C, 760CD, 760E, 760ED, 760EL, 760ELD, 760L, 760LD, 760XD, 760XL 765D, 765L PC110
IrDA 1.1 (FIR - 4Mbps)
240, 240X 380, 380D, 380E, 380ED, 380XD, 380Z 385D, 385ED, 385XD 390, 390E, 390X 535X 560E, 560X, 560Z 570, 570E 600, 600E, 600X 770, 770E, 770ED, 770X, 770Z A20m, A20p, A21e, A21m, A21p, A22e, A22m, A22p, A30, A30p, A31, A31p i Series 1720, i Series 1721 R30, R31, R32, R40, R50, R50p, R51, R52 T20, T21, T22, T23, T30, T40, T40p, T41, T41p, T42, T42p, T43, T43p, T60, T60p X22, X23, X24, X30, X31, X32, X40, X41, X41 Tablet, X60, X60s Z60m, Z60t, Z61m TransNote
Categories:
365C 365CD 365CS 365CSD 365E 365ED 365X 365XD 535 535E 560 755CD 755CDV 755CE 755CSE 755CV 755CX 760C 760CD 760E 760ED 760EL 760ELD 760L 760LD 760XD 760XL 765D 765L PC110 240 240X 380 380D 380E 380ED 380XD 380Z 385D 385ED 385XD 390 390E 390X 535X 560E 560X 560Z 570 570E 600 600E 600X 770 770E 770ED 770X 770Z A20m A20p A21e A21m A21p A22e A22m A22p A30 A30p A31 A31p I1720 I1721 R30 R31 R32 R40 R50 R50p R51 R52 T20 T21 T22 T23 T30 T40 T40p T41 T41p T42 T42p T43 T43p T60 T60p X22 X23 X24 X30 X31 X32 X40 X41 X41 Tablet X60 X60s Z60m Z60t Z61m TransNote Components Glossary
