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а че его искать? вот он
Delivery Traffic Indication Map = индикаторная карта трафика доставки и вот
...так называемый DTIM-интервал (delivery traffic indication message – сообщение о наличии пакетов для станции) и вот
Delivery traffic indication map. A special type of traffic indication map (TIM) element in a beacon frame that occurs only when a station in a basic service set (BSS) is in power-save mode. A DTIM indicates that any buffered broadcast or multicast frames are immediately transmitted by an AP (AP). и вот
(Delivery Traffic Indication Message) - A message included in data packets that can increase wireless efficiency. и наконец вот
A Delivery Traffic Indication Message is a kind of Traffic Indication Message(TIM) which informs the clients about the presence of buffered 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 buffered 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).
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