Madge Networks 802.11b Manuel d'utilisateur Page 27

  • Télécharger
  • Ajouter à mon manuel
  • Imprimer
  • Page
    / 45
  • Table des matières
  • MARQUE LIVRES
  • Noté. / 5. Basé sur avis des utilisateurs
Vue de la page 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
Vue de la page 26
1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 44 45

Commentaires sur ces manuels

Pas de commentaire