Figure 35 Backup Nxc-8160 Example - ZyXEL Communications NXC-8160 User Manual

Chapter 7 Advanced Settings
However, if the main NXC-8160 (P) encounters a problem (such as an unexpected crash or a
loss of power) but the reference server (R) still remains in constant contact with the backup
NXC-8160 (B), then the backup takes over for the main. When this happens, users connected
to the wireless network may experience a momentary disconnect as the backup APs take over.

Figure 35 Backup NXC-8160 Example

When you configure a backup NXC-8160, all the configuration settings from
the main NXC-8160 are automatically copied over. This also includes all
ESSID and AP configurations.
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NXC-8160 User's Guide