A bit more about the technologies involved...
Hewlett Packard Laboratories, Palo Alto
3 August 00
La culture c'est comme la confiture, moins on en a, plus on l'étale...
I'm not pretenting to teach a course on Wireless LAN. I guess
that many books explain the subject in more details and accuracy than
me (anyway, I hope). I just feel that many users of Wireless LANs
don't really know what is inside their magic piece of kit and are
curious about it. I hope that this document will help you to
understand a bit more of the different technological aspects and
compare the different Wireless LANs functionalities.
While working on the Wavelan driver and the Wireless Extensions, I've
gathered much information trying to understand how it works. The
vendors documentation and web sites have been also very helpful, many
of them really try to explain the technologies behind their products
and provide white papers. The Net contains also a lot of papers
and reports on the subject of wireless LANs and radio communications.
I have still a limited knowledge and understanding of the wide numer
of technologies used by Wireless LANs, so I hope that it is mostly
accurate, complete and that it will help you. If some knowledgeable
person could help me to improve this document, or if anybody could
give me some suggestions or corrections, I would be glad...
This document is the third part of the Linux Wireless LAN
Howto, located at http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/, and
available in HTML, PostScritp or PDF form. Please refer to its first
part for details (copyright, disclaimers...) and a list of some other
web pages on the subject.
2 MAC, LAN, Layer and other strange words...
3 Anatomy of a radio LAN
A radio network is a collection of nodes communicating together
through radio devices, using radio waves to carry the information
exchanged (obvious, isn't it ?). It is sometime called a radio
Ethernet, by analogy of the wired technology. Most radio
devices are a card (ISA, Pcmcia) to plug in a PC (or workstation),
and interact directly with the standard networking stack on it (no
need of PPP or any specific protocol stack).
4 The radio modem (physical layer)
This section of the document deals with all the issues related to the
physical layer (bottom of the pile, OSI wise :-), or in our case the
5 The MAC level (link layer)
This section of the document focus on the next layer up, the link
layer. This mostly comprise the MAC (Medium Access Control)
protocol. Different MAC protocols and techniques are presented.
6 Some Wireless LAN standards
A short gallery of the most famous Wireless LAN standard (but
unfortunately not necessarily the most widespread...).
Linux Wireless LAN Howto -
Converted to html from Frame Maker - 25 August 98
Updated 3 August 00
Copyright © 1996-2004 Jean Tourrilhes
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