What does DTIM mean in Unclassified?

Delivery Traffic Indication Message

Traffic indication map (TIM) is a structure used in 802.11 wireless network management frames. The Traffic indication map information element is covered under section 7.3.2.6 of 802.11-1999 standard.The IEEE 802.11 standards use a bitmap to indicate to any sleeping listening stations that the Access Point (AP) has buffered data waiting for it. Because stations should listen to at least one beacon during the listen interval, the AP periodically sends this bitmap in its beacons as an information element. The bit mask is called the Traffic Indication Map and consists of 2008 bits, each bit representing the Association ID (AID) of a station. However in most situations an AP only has data for a few stations, so only the portion of the bitmap representing those stations needs to be transmitted. Because the bitmap is never transmitted in its entirety, it is referred to as a virtual bitmap, and the portion that is actually transmitted is referred to as a partial virtual bitmap.

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