Madge Networks 802.11b Manual do Utilizador descarregar pdf (Página 26)

802.11 Modes of Operation

• Most wireless devices cannot transmit and listen

at the same time on a single frequency, thus

CSMA/CD is not used

• The supported modes of operation are:

– DCF, Distributed Coordination Function

• No central controller; just like Ethernet

• Protocols used are:

– CSMA/CA (CSMA with Collision Avoidance)

– CSMA/CA with virtual channel

–PCF, Point Coordination Function

• The base station controls all activities

• Prioritized transmissions possible

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Madge Networks 802.11b Manual do Utilizador Página 26