DTIM

DTIM

A Delivery Traffic Indication Message is a kind of Traffic Indication Message(TIM) which informs the clients about the presence of buffered and/or multicast/broadcast data on the access point. It is generated within the periodic beacon at a frequency specified by the DTIM Interval. [citeweb|title=DTIM interval|url=http://reviews.cnet.com/4520-6029_7-6210011-1.html|publisher=cnet.com|accessdate=2008-02-17] Beacons are packets sent by an access point to synchronize a wireless network. Normal Traffic Indication Message(TIM)s that are present in every beacon are for signaling the presence of unbuffered unicast data. After a DTIM, the access point will send the multicasted/broadcasted data on the channel following the normal channel access rules (CSMA/CA). Also see WiFi as established by the Wi-Fi Alliance

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