Chapter 1 Introducing the Zyxel Device
VMG/XMG Series User’s Guide
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1.1.5  WAN Priority
The WAN connection priority is as follows:
1 Ethernet WAN
2 G.fast/DSL
3 Cellular WAN (3G/4G)
See Section 1.1.7 on page 22 for more information about Cellular backup.
1.1.6  Wireless Access
The Zyxel Device is a wireless Access Point (AP) for IEEE 802.11b/g/n/a/ac wireless clients, such as 
notebook computers, iPads, smartphones, etc. It allows them to connect to the Internet without having 
to rely on inconvenient Ethernet cables.
Your Zyxel Device supports WiFi Protected Setup (WPS), which allows you to quickly set up a wireless 
network with strong security.
See Section Table 14 on page 44 for more information about how to set up a wireless network with WLAN 
and WPS buttons.
Figure 5   Wireless Access Example
1.1.7  Zyxel Device’s USB Support
The USB port of the Zyxel Device is used for cellular WAN backup, file-sharing, and media server.
Cellular WAN (3G/4G) Backup
Connect a supported cellular USB dongle with an active SIM card to the USB port. This adds a second 
WAN interface and allows the Zyxel Device to wirelessly access the Internet via a cellular network. The 
cellular WAN connection is a backup in case the DSL connection fails.
To set up a cellular connection, click Network > Broadband > Cellular Backup.