US Robotics USR2450 Informacje Techniczne Strona 8

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V 2.2 Copyright SystemExperts 2001,2002,2003
15
802.11b Frame Control
n 3 types of 802.11b packets
n Management (type 00)
n {association, re-association, probe} {request, response}
n authentication, de-authentication, & disassociation
n beacon
n e.g., time-stamp, traffic indication map, supported rates
n ATIM Announcement Traffic Information Message
n sent after each frame
n Control (01)
n RTS, CTS, ACK, CF*, PS-Poll
n Data (10)
n ok, data! plus
n CF-ACK/Poll, etc.
V 2.2 Copyright SystemExperts 2001,2002,2003
16
802.11b IBSS
n Independent Basic
Service Set (IBSS)
n Ad-Hoc mode
n Often called peer-to-peer
n No Access Point (AP)
n i.e., with just your client
cards
n No wired connections,
only link wireless clients
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