A Field Guide to Wireless LANs for Administrators and Power Users

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Working Group members, I have come to fully appreciate that I do not know everything there is to know about this subject. However, you can rest assured that whatever is in this book is as accurate as I could make it as of the time it was written. It took me a long time to digest the standard(s) (no criticism to the IEEE 802.11 WG, but these documents aren't easy to read!), and I really didn't "get it" until I had the chance to play with some real hardware and put all my knowledge to some actual use. Besides real products, I also have had access to wireless LAN diagnostic tools, such as packet sniffers, which helped me to see what was really going on "under the covers." I cannot claim to have top-to-bottom knowledge of wireless LAN technology. My knowledge base is centered at the Data Link and Network layers, and I will be the first to admit that I am no expert in Physical layer modulation schemes. In my judgment, this is arcane knowledge (another of my subjective assessments, but I think it would be difficult to convince WLAN users that they needed to understand this stuff any more than Ethernet users could be convinced that they need to understand Differential Manchester encoding). If this sort of thing is what you are looking for, you will find just enough of it here for me to be able to tell you how the various schemes differ, and more importantly, what they are used for. If you want more details on information theory, coding theory, and so forth, there are many excellent books on those subjects. I will make sure that the reader understands the terms FHSS, DSSS, CCK, PBCC, and OFDM (and more) and will be able to tell them apart. I'm not even going to tell you what those mean now. Read Chapter 3, Speeds and Feeds, for that information.... I will cover the Physical layer technologies in sufficient detail to explain what they do, but I won't try to convince you that I am intimately familiar with their inner workings. I know what they do, and I think that's all that most people need to know (heck, if this stuff works smoothly enough, most users won't ever even need to wonder how it works). When I needed to learn more about WLANs, I found that the best reference was usually the standards themselves, despite their being written less than clearly. The IEEE 802.11-1999 standard is a large enough document that even experienced network software engineers needed "handbooks" to help them find their way through it. At the time, however, WLAN technology was just beginning to mature into a consumer-level technology that needs some basic treatment for mass audiences. By now, that transition is well under way. WLAN-enabled products are hot. There are other excellent books on wireless LANs if you need to run right out and design your own wireless LAN implementation; however, books for users are few and far between. I hope to ease the acquisition of the new "language skills" that are necessary to become comfortable with this technology. To deploy and use WLANs, much of this knowledge is not required--vendors try to make their products fairly bulletproof to keep their support costs down. However, if you need to set up and manage a WLAN, you'll want to know enough to be effective, without needing to drown in details. If you ever need to go behind the scenes and debug a problem, you will need to have the context that I provide in this book. It's difficult to fix a problem unless you can notice it. To do that, you need to know what the normal behavior is expected to be. If you want to use products based on IEEE 802.11 and need to understand the terminology involved in the standard, so that you can use, deploy, or manage the technology with the minimum of confusion, then this is the book for you. Ultimately, it is my assertion that very few people really need to know about which radio frequencies are being used, or the ways that data is modulated onto those frequencies

Book Info:
Published in 2003
Published by Prentice Hall
Author Thomas Maufer
ISBN 0131014064  Size 2.94MB

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