DTIM

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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.^[1] 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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