TP-Link TL-MR3420 User Manual page 33

3G Preferred
In this mode, the router will try 3G access first;
When 3G access fails and WAN access is valid, or when no 3G USB modem is inserted, the
router would switch to WAN access;
When the router succeeds to connect to the 3G network, the router would stop the WAN
connection and switch back to 3G access immediately.
3G Only
In this mode, the router will try 3G access only. WAN access is disabled.
WAN Preferred
In this mode, the router will try WAN access first;
When the WAN access fails, and 3G access is valid, the router would switch to 3G access;
When the router succeeds to connect to the WAN network, the router would stop the 3G
connection and switch back to WAN access immediately.
WAN Only
In this mode, the router will try WAN access only. 3G access is disabled.
Click the Save button to save your settings.
Note:
1) In 3G preferred and WAN preferred modes, until 2010-5-18, the failover/backup function only
works between 3G link and PPPoE / Dynamic IP / Static IP.
2) The failover/backup feature between 3G link and BigPond Cable / PPTP / L2TP will be
available in the near future. Please visit our website to download the latest firmware:
http://www.tp-link.com/support/download.asp
3) If you are using the 3G Preferred or WAN Preferred, the router would connect, disconnect or
switch the current access automatically. The Connect/Disconnect button (on 3G, PPPoE,
PPTP, L2TP) and some related parameters could not be set manually.
TL-MR3420
Figure 4-5 Internet Access Mode
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3G/3.75G Wireless N Router