Draytek Vigor2820 Series User Manual page 51

Enable
Display Name
Physical Mode
Physical Type
Choose Yes to invoke the settings for this WAN interface.
Choose No to disable the settings for this WAN interface.
Type the description for the WAN1/WAN2 interface.
For WAN1, the physical connection is done through ADSL port;
yet the physical connection for WAN2 is done through an
Ethernet port (P1) or USB port. You cannot change it.
To use 3G network connection through 3G USB Modem,
choose 3G USB Modem as the physical mode in WAN2. Next,
go to WAN>> Internet Access. 3G USB Modem is available
for WAN2. You can enable PPP as the access mode and
complete further configuration.
This setting is available for WAN2 only. You can change the
physical type for WAN2 or choose Auto negotiation for
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Vigor2820 Series User's Guide