September 2003
Intermediate to advanced
304 pages
8h 39m
English
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Bluetooth: Cable Replacement for Devices
Bluetooth eliminates the need for cables that tether your tiny devices.
While the 802.11 protocols were designed to replace the ubiquitous CAT5 networking cable, Bluetooth aims to replace all of the other cables connected to your computer (with the sad exception of the power cable). Operating as a frequency hopper in the 2.4 GHz ISM band, it shares the same spectrum as 802.11b/g and many other devices. It is designed to create a so-called “Personal Area Network” for devices like cell phones, digital cameras, PDAs, headsets, keyboards and mice, and of course, computers. While it is possible to use Bluetooth for an actual Internet connection, it seems to be better suited for low bandwidth data and voice applications.
Pros
Very low power requirements, making it ideal for small battery-powered devices such as handhelds, phones, and headsets.
Simple interface and security model.
Exceptional interoperability between devices.
Built-in support for simultaneous data and voice traffic.
Cons
Relatively low data throughput (about 720 Kbps maximum).
Shares the 2.4 GHz band with many other devices, including 802.11b/g.
Very limited range, by design.
Recommendation
Bluetooth uses an aggressive full duplex frequency-hopping scheme (changing channels up to 1,600 times per second) to attempt to avoid noise in the 2.4 GHz band. While this may be good for Bluetooth, high power frequency-hopping devices can cause considerable interference for other devices using the ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.