Madge Networks 802.11b Bedienungsanleitung Seite 27

  • Herunterladen
  • Zu meinen Handbüchern hinzufügen
  • Drucken
  • Seite
    / 45
  • Inhaltsverzeichnis
  • LESEZEICHEN
  • Bewertet. / 5. Basierend auf Kundenbewertungen
Seitenansicht 26
DCF
DCF, Distributed Coordination Function
No central controller; just like Ethernet
Protocols used are:
CSMA/CA (CSMA with Collision Avoidance)
Sense the channel before transmitting. If idle, transmits. It does
not sense the channel while transmitting
Waits DIFS+RandomTime before transmitting
Receiver waits SIFS time before acknowledging
Using duration field in 802.11 frame other nodes backoff this
much amount of time (NAV)
CSMA/CA with virtual channel
Perform channel reservation
RTS alerts and indicates duration of frame for sender’s range
CTS alerts and indicates duration of frame for receiver’s range
Seitenansicht 26
1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 44 45

Kommentare zu diesen Handbüchern

Keine Kommentare