Here you go.
DTIM has to do with power management. With every beacon comes a TIM (traffic indication map). Basically, a power-managed card wakes up and waits for a TIM. A TIM tells the client card that there's data waiting for it at the access point. When there's data waiting, the access point indicates this with at DTIM message.
A shorter DTIM will cause the card to wake up more often to download waiting data. A longer DTIM will keep the card in power-save mode longer, however, since more data will be waiting, the card will have to stay on longer to collect the waiting information.
Also remember that if the beacon period is set at 100, and the data beacon rate is set at 2, then the Access Point sends a beacon containing a DTIM every 200 Kµsecs
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