ZyXEL Communications P-870H-51a v2 - Manual (Page 9)

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2. Enable wireless LAN, enter a name to identify your wireless network
(such as “ZyXEL“) in the SSID field, and select a channel which is not
used by neighboring wireless devices.
3. Select your security mode and configure wireless security settings. In
this example, the P-870HW-51a v2 uses WPA2-PSK for data
encryption.
If you do not set wireless security, any one within range could use your
P-870HW-51a v2 to access your network and the Internet.
Make sure your wireless security settings are compatible with your
existing wireless devices. See the User's Guide for more information on
wireless networks.
Go to the WLAN Setup with WPS section if you do not want to use the
wireless LAN screen to set up your wireless network.