Beam Receive Speed

[jace48]

Hello all,

What speed under beam receive does the Zaurus Irda work?
Under Windows XP it shows connected at 115K but the actual file transfer happens at 9.6 K

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[rob_figlabs]

Hi,

For slow IrDA (SIR) the maximum connection speed is 115200 bits per second (or 115 kilobits per second). So you divide by 8 to get kilobytes per second (14 KB/s). Add in the fact that IrDA is half duplex - only one side transmits data at a time, lighting conditions and positioning of the devices can degrade the link quality, and also that the IrDA protcol has some overhead then, in practice, you probably only get about 7 KB/ s transferred. Getting 9.6K is quite good if you've achieved it!

Some devices (not the zaurus  ) have Fast Infrared (FIR) which is 4Mbps which means it is in theory 35 times faster than SIR so you could get 245KB per second transferred.

Rob

[jace48]

So you divide by 8 to get kilobytes per second (14 KB/s). Add in the fact that IrDA is half duplex - only one side transmits data at a time, lighting conditions and positioning of the devices can degrade the link quality, and also that the IrDA protcol has some overhead then, in practice, you probably only get about 7 KB/ s transferred. Getting 9.6K is quite good if you've achieved it!

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I was planning to get any Ir phone for internet access but I guess I will drop it now.

BTW is Zaurus Irda Half Duplex or the my Irda adapter? I am using MA-620 USB Irda adapter.

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[rob_figlabs]

It's the IrDA protocol that is half duplex - so all IrDA devices are.

If you just want to use it for Internet access then I think it will be fine. I often don't get much higher speeds out of GPRS anyway. So, unless you have a 3G phone, have paid for faster GPRS or are in an uncongested network cell then I don't think you'd see much practical difference.

The problem I always had of browsing via an IR phone was trying to balance the phone on one knee and the handheld on the other while sitting on a train   So I got a bluetooth card and phone instead.