Configure for 1 or 2 for SSIDs supporting smart devices. Configure for up to 10 in industrial environments with applicable client devices.
DTIM stands for a Delivery traffic indication map or message. It is basically an additional message added after the normal beacon broadcast by your router or access point.
The more often that DTIM is transmitted, the more often that your mobile devices wake up, and the more battery that it uses (due to the lack of “sleep”). By setting a low value of DTIM and beacon interval, you can effectively keep your devices awake indefinitely so they never go into sleep mode when idling. In some cases, the “no sleep” setup can use up to 10~20% additional power consumption.
Investigation:
- Start WiFi Scanner
- Filter/Select desired SSID
- Under SSID details look at element 5 Traffic Indication Map (TIM)
- DTIM Count (1 byte)- how many beacon frames(including current one) appear before next DTIM. Value 0 indicate current TIM is a DTIM
- DTIM Period (1 byte) – number of beacon interval between successive DTIMs
Traffic Indication Map (TIM): DTIM Count: 0 | DTIM Period: 1
Number: 5
Length: 4 bytes
DTIM Count: 0
DTIM Period: 1
Bitmap Control: 0x00
. . . . . . . 0: Multicast: False
0000 000. : Bitmap Offset: 0x00
Partial Virtual Bitmap: 0x00
Data: 00010000
Aruba Solution
- Login to Aruba Virtual Controller
- Click Configuration
- Click Network
- Choose a network and click the pencil icon to edit
- Show Advanced Options
- Under 802.11 find DTIM interval
- Select the Value you want
- Apply Changes