D-Link DWM-312W User Manual page 67

Section 4 - Configuration
General Settings
Channel If Select Channel Automatically is disabled, select the desired
channel here.
Enable periodic
Select this to set the router to automatically repeat the channel scan.
scanning
Scanning period
If the previous option is enabled, use this to instruct the router how
often to perform the scan.
D-Link DWM-312W User Manual 63