D-Link DSL-2750U Manual

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FAQ : How To Configure 3G WAN Fail Over
Technical Support Setup Procedure
FAQ: How To Configure 3G WAN Fail Over
Release date: 4/11/2011
Model Support: DSL-2750U
H/W: T1
F/W: TH_1.01

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FAQ : How To Configure 3G WAN Fail Over
Technical Support Setup Procedure
3G WAN Fail Over 

1. –TH_1.01

GUI
2. 3G USB  
http://bit.ly/s1JgVV
: 

1:  ,   , 
Address IP Address DSL-2750U 192.168.1.1 
Enter 

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FAQ : How To Configure 3G WAN Fail Over
2: (User Name) 
(Password) “admin” Validate
Code Log In

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FAQ : How To Configure 3G WAN Fail Over
3: SETUP 3G Internet Setup 
3G USB dongle USB DSL-2750U  
 (modem status) DISCONNECT  
Add

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FAQ : How To Configure 3G WAN Fail Over
4: “Enabled USB Modem”
APN 3G, (username) , password) dial number 

“Apply/Save”

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FAQ : How To Configure 3G WAN Fail Over
5: modem status  “CONNECTED”
:  Manual Dial “Manual Dial” 
3G WAN failover 

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FAQ : How To Configure 3G WAN Fail Over
6: CONNECTED  Status > Device Info
3G (public IP address) (
mobile Internet Connection) 
3G

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FAQ : How To Configure 3G WAN Fail Over
Note: WAN fail over 3G 
ADSL 
 Manual Dial “Manual Dial” 
3G WAN failover 
ADSL3G DSL-2750U 
ADSL (Primary WAN connection)

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FAQ : How To Configure 3G WAN Fail Over
ADSL 3G 
disconnected (standby) WAN Fail Over

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FAQ : How To Configure 3G WAN Fail Over
ADSL DOWN 3G dongle 
3G 3G 

Note: 3G 


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FAQ : How To Configure 3G WAN Fail Over
ADSL 3G disconnected 
ADSL 

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FAQ : How To Configure 3G WAN Fail Over
Technical Support Setup Procedure
How to Configure 3G WAN Fail Over
Before you start:
1. Please make sure your firmware has been upgraded to the
latest version –TH_1.01. You may check your current firmware
version from the top right corner of the device WEB
management GUI.
2. Please check if your 3G USB Adapter is in the compatibility list
via this link -> http://bit.ly/s1JgVV
CAUTION: Please use a wired connection between the PC and the device
when doing configurations.
Step 1: Open a web browser such as Internet Explorer, Mozilla Firefox, Safari and etc. On the Address
bar type in the LAN IP Address of the DSL-2750U which is 192.168.1.1 and then press on the Enter
key on your keyboard.
Step 2: A login screen will appear, type in the User Name and the Password as “admin” all in lower
case and then type in Validate Code and then click on the Log In button.

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FAQ : How To Configure 3G WAN Fail Over
Step 3: Go to SETUP tab, select ‘3G Internet Setup’ on the left hand side.
Plug in the 3G USB dongle to the USB port at the back of the DSL-2750U. Wait for the “modem
status” to change to “DISCONNECT” (This may take several minutes). After that, Click “Add”.

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FAQ : How To Configure 3G WAN Fail Over
Step 4: Check the box “Enable USB Modem”
Enter the APN of your 3G service provider, username, password and dial number, if any (pls check the
setting with your service provider if you are not sure).
Click “Apply/Save”.
Step 5: Wait for the “modem status” to show “CONNECTED”
CAUTION: Do NOT click on the “Manual Dial” button. Clicking on “Manual Dial” button will force
the 3G connection to become the primary internet connection, and WAN failover function will NOT
work!

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FAQ : How To Configure 3G WAN Fail Over
Step 6: Once it shows “CONNECTED”, you may go to Status>Device Info to check the 3G internet
connection status and the public IP address. (Please choose “mobile” from the “Internet
Connection” drop down list). You may access internet via 3G connection now.

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FAQ : How To Configure 3G WAN Fail Over
Note: To achieve WAN fail over, 3G connection will be triggered to connect
automatically when ADSL connection is not available.
Please Do NOT click on the “Manual Dial” button. Clicking on “Manual Dial” button will
force the 3G connection to be used as the primary internet connection, and WAN failover
function will NOT work!
By default, when there is an ADSL connection and a 3G connection configured on the DSL-2750U, it
will take the ADSL connection as the PRIMARY WAN connection.
If ADSL connection is up and running, 3G connection will be in „disconnected‟ status. It will standby
for WAN Fail Over.

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FAQ : How To Configure 3G WAN Fail Over
When the ADSL connection is DOWN, as long as your 3G dongle is connected to the device and you
have done your 3G configuration properly, 3G connection will be triggered automatically to take over
as the primary internet connection.
Note: This may take about a minute to get connected (depends on 3G signal and connectivity within
your area).

-18-
FAQ : How To Configure 3G WAN Fail Over
When ADSL connection is back online, 3G connection will be disconnected.
ADSL connection will take over as the primary internet connection again.

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FAQ : How To Configure 3G WAN Fail Over
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