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
---------
Full Version: Beam Receive Speed
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
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
QUOTE(rob_figlabs @ Jun 16 2005, 10:18 AM)
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!
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.
--------
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.
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.
This is a "lo-fi" version of our main content. To view the full version with more information, formatting and images, please click here.