February 2009
Beginner
288 pages
7h 48m
English
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Operating Channels
Wi-Fi uses a segment of the radio spectrum (also called a band) near 2.4 GHz that has been reserved for unlicensed industrial, scientific, and medical (ISM) services, including wireless data networks. 802.11b, 802.11g, and 802.11n all use this band of frequencies. 802.11a uses a different frequency band near 5.2 GHz known as the Unlicensed National Information Infrastructure (U-NII).
Both the ISM and U-NII bands are open to many kinds of unlicensed radio services. This means that the people who make the equipment must demonstrate that their designs meet various regulations related to maximum power, interference, and so forth, but actual users (that's you and me) don't need to obtain licenses before they can operate approved radios. ...
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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.