D-Link DIR-860L User Manual page 45

Section 3 - Configuration
Channel.Width:
Select the Channel Width:
Auto.20/40/80 - Select if you are using 802.11ac, 802.11n, and non-802.11n wireless devices.
Auto.20/40 - This is the default setting. Select if you are using both 802.11n and non-802.11n wireless devices.
20.MHz - Select if you are not using any 802.11n wireless clients.
Visibility.
Select Invisible if you do not want the SSID of your wireless network to be broadcast by the DIR-860L. If Invisible is selected, the
Status:
SSID of the DIR-860L will not be seen by site survey utilities so your wireless clients will have to know the SSID of your DIR-860L in
order to connect to it.
Wireless.
Refer to "Wireless Security" on page 42 for more information regarding wireless security.
Security:
D-Link DIR-860L User Manual 41