D-Link DIR-825 User Manual page 42

Section 3 - Configuration
Channel Width:
Select the Channel Width:
Auto.20/40 - This is the default setting. Select if you are using both 802.11n and non-802.11n wireless devices.
20MHz - Select if you are not using any 802.11n wireless clients.
Visibility Status: Select Invisible if you do not want the SSID of your wireless network to be broadcasted by the DIR-825. If Invisible is selected, the
SSID of the DIR-825 will not be seen by Site Survey utilities so your wireless clients will have to know the SSID of your DIR-825 in
order to connect to it.
Wireless Security:
Refer to page 38 for more information regarding wireless security.
D-Link DIR-825 User Manual 37