Gobi AT&T Mobile Settings
Overview
This document will quickly walk you through running the Gobi Carrier Wizard, how to setup the device for AT&T networks.  This could also be used for a guide for other GSM networks.
CAUTION: Installation of your SIM card must be done while the unit is powered off.  DO NOT install the SIM while the unit is powered up as damage to the SIM and/or TransPort may occur.
 
Assumptions
This guide assumes that you have a PC that is able to reach the TransPort through the Ethernet interface to gain access to the WebUI for configuration purposes.
 
Information You will Need
Before you attempt to set up your Transport for mobile connection, you will need the following items from AT&T:

• The assigned APN (Access Point Name)
• PIN Number for your SIM card, if AT&T explicitly says it is required
• Username and Password, if AT&T explicitly says it is required

 
Running the Gobi Carrier Wizard
The first thing that will need to do be done is run the Gobi Carrier Wizard to enable the device for AT&T.  The following steps will guide you through this process:
 
1) Log into the WebUI through the Ethernet interface. (Default IP address is 192.168.1.1)
 
2) Once in the WebUI, click on Wizards on the upper-left hand side, as shown in the screenshot below:



3) Click on the GOBI Carrier Wizard, and then click Next, as shown in the screenshot below:



4) Choose AT&T, and click Next, as shown below:



5) On the next page, you will see a line that says “Save configuration changes here”, with the “here” being blue in color and underlined. Click the ‘here’ link and then click Save on the next screen. Reboot the device after saving.
 
6) After the device reboots, log back into the WebUI.
 
7) Navigate to Configuration > Network > Interfaces > Mobile > Mobile Settings.
 
8) Fill in the appropriate settings for the SIM card that was supplied by AT&T.   
Note: You should see the IMSI number for your SIM.
Note: Most carriers will only require an APN for connectivity.  Leave the other fields blank unless AT&T explicitly tells you to use them. 



9) Click Apply and Save the settings.  Note that this will take ~30 seconds or so.  Once the process completes, a message at the top of the page will indicate if it has either been successful or failed to save the settings. If successful, click the Reboot link and reboot the device.  If failed, try to setup the mobile settings again.  Please email Digi Technical Support with the debug.txt file (please see “When contacting Digi Technical Support” below) if the failure continues.  
 
Once the unit has been rebooted, it could take another minute or so before it establishes an IP address.
 

Indicators, WebUI
 
LED Displays
 
For the WR41 & WR44
W-WAN NET
Will illuminate steady if the unit is able to log on to the AT&T mobile network.

W-WAN SIM
This LED should illuminate green if a SIM card is present.

W-WAN DAT
Represents data passing to and from the network.

Signal Strength
Here is a guide for the signal strength:

• -113 dBm or less (0 LED) -> effectively no signal
• -112 dBm to –87 dBm (1 LED) -> weak signal
• -86 dBm to –71 dBm (2 LEDs) -> medium strength signal
• -70 dBm or greater (3 LEDs) -> strong signal

The minimum recommended strength indication is 2 LEDs. If you have no or 1 LEDs lit, it is recommended that you fit an external antenna to the unit.
 
For the WR21
Service
Illuminates steady when there is a network connection to the WWAN interface and flashes when data is transmitted or received.

WWAN
Flashes to show which network mode the unit is operating in:

• Off - no service
• 1 blink - GPRS mode
• 2 blinks - EDGE mode
• 3 blinks - UMTS mode
• 4 blinks - HSDPA mode
• 5 blinks - HSUPA mode
• On steady - CDMA mode

Signal Strength
Here is a guide for the signal strength:

• -113 dBm or less (0 LED) -> effectively no signal
• -112 dBm to –87 dBm (1 LED) -> weak signal
• -86 dBm to –71 dBm (2 LEDs) -> medium strength signal
• -70 dBm or greater (3 LEDs) -> strong signal

The minimum recommended strength indication is 2 LEDs. If you have no or 1 LEDs lit, it is recommended that you fit an external antenna to the unit.
 
 
 
 
WebUI
 
Locating the Mobile IP Address
 

1. On the Home page, you should see the Mobile IP address under PPP1 (W-WAN (CDMA)).

 
 
 

2. Under Management > Network Status > Interfaces > Mobile

 
 NOTE:  Use the above screenshot as a reference for the below information.
 
Mobile Connection  
 
Registration Status
The GSM registration status of the mobile module with respect to the GSM network. It may be one of the following

• Not Registered, not searching
• Not registered, searching
• Registered, home network – Note that this is ideal
• Registered, roaming
• Registration denied
• Unknown
• ERROR

The registration status may sometimes be followed by additional information about the Location Area Code (LAC) and the Cell Identifier (CI).

Signal Strength
The signal strength in dBm being received by the mobile module.
Here is a guide for the signal strength:

• -113 dBm or less (0 LED) -> effectively no signal
• -112 dBm to –87 dBm (1 LED) -> weak signal
• -86 dBm to –71 dBm (2 LEDs) -> medium strength signal
• -70 dBm or greater (3 LEDs) -> strong signal

The minimum recommended strength indication is 2 LEDs. If you have no or 1 LEDs lit, it is recommended that you fit a high-gain external antenna to the unit. 
 
 
Mobile Statistics
 
IP Address
The IP address of the mobile interface.

Primary DNS Address / Secondary DNS Address
The primary and secondary DNS addresses used by the mobile interface

Data Received
The number of data bytes that have been received on the mobile interface whilst it has been connected.

Data Sent
The number of data bytes that have been sent on the mobile interface whilst it has been connected.   
 
 
Mobile Information  
For GSM networks, the Mobile Information section can have the following items.
 
SIM Status
This indicates whether or not a valid SIM card has been installed in the router. It may be one of the following

• READY - SIM is OK
• SIM PIN - PIN number required
• SIM PUK - SIM blocked (unblocking code required)
• ERROR - SIM is not installed or is faulty

 
Radio Technology
The current network technology in use. It may be one of the following

• GSM
• GPRS
• EDGE
• UMTS
• HSDPA
• HSUPA
• CDMA 

 
Manufacturer
The manufacturer of the mobile module.  For a Gobi module, you should see either Huawei Incorporated or Qualcomm Incorporated.
 
Model
The model of the mobile module.  Examples for the Gobi would be Huawei EM680, Qualcomm Gobi 2000, Qualcomm Gobi 3000.
 
IMEI
The International Mobile Equipment Identification (IMEI) of the mobile module.
 
ESN
The Electronic Serial Number (ESN) of the mobile module.
 
MEID
The Mobile Equipment Identifier (MEID) of the mobile module.
 
IMSI
The International Mobile Subscriber Identity (IMSI) of the mobile module.
 
ICCID
The Integrated Circuit Card Identifier (ICCID) of the SIM card.
 
Firmware
The firmware running on mobile module.
 
Bootcode
The bootcode firmware running on the mobile module.
 
Hardware Version
The hardware version of the mobile module.
  
GPRS Attachment Status
The current status of the mobile module with respect to the Mobile service. It may be one of the following

• Not attached - the unit has not connected to a mobile service.
• Attached - the unit has connector to a mobile service.
• ERROR - unknown response from the mobile module.

 
GPRS Registration
See Registration Status under Mobile Connection.
 
Network
The name of the GSM network to which the mobile module is currently connected to or ERROR if no network is available.  The numbers at the end is the Mobile Country Code (MCC)/Mobile Network Code (MNC).
 
Preferred system
The preferred technology. It can be one of following

• Auto
• GSM only
• WCDMA only

 
Raising and Lowering the Cellular Link

• Under Management > Connections > PPP Connections > PPP 1 – W-WAN, you should see the Mobile IP Address, the Primary and Secondary DNS Address, as well as buttons to Drop or Raise the link. 

 
 

Locating the Event Log
 
Under Management > Event Log
This page displays the current contents of the event log on the router.  This log records events throughout the Digi device’s system including cellular information.  Some of this cellular information you might see would be status codes, error codes, signal strengths, tower locations, & service available.
Note: The newest information is on top of this file.
 
 
Testing
Once you have set up the mobile settings on your unit and you see a mobile IP address, there are a couple of quick tests you can do to ensure your device is working.
 
Ping Test
 
Go to Administration > Execute a command.  Enter ping followed by a hostname or IP address and then click Execute.
 
For example:  ping www.digi.com

1. If the result is good, you will see the response time as well as Success of 100%. 
2. If the result says ‘unable to resolve <hostname>’, then something is wrong with the DNS primary and secondary addresses.  Please look under Management > Connections > PPP Connections > PPP 1 – W-WAN to verify you have a primary and secondary DNS address.
3. You should also try to ping a working, public IP address instead of a hostname.  For example: ping 66.77.174.59
4. If this result is good (see above for a good response), then again there is something wrong with the primary and secondary DNS addresses.
5. If the result fails, you will see ‘no response from <ip address>’.  Please verify you have a mobile IP address by going to Management > Connections > PPP Connections > PPP 1 – W-WAN.
6. If you do not have an IP address, please email Digi Technical Support with the debug.txt file (please see “When contacting Digi Technical Support” below).
7. If you do have a mobile IP address, but cannot ping to a valid, public IP address, please verify with the provider if you have a public or private mobile IP address.

 
 Accessing the Internet
 
If you have a laptop or computer directly connected to your Transport, you can try opening a browser and accessing the Internet.
 
NOTE: In order for this step to be a valid test, you must ensure you do not have another source to the Internet, such as being connected to your company’s network either via Ethernet or over Wi-Fi.
 
If this fails, please verify the Ping Test still passes.  If the ping test passes and you cannot access the Internet, please email Digi Technical Support with the debug.txt file (please see “When contacting Digi Technical Support” below).

 
Accessing the Transport Remotely
 
If you have a Mobile Terminated account, you should be able to access the Transport remotely.  Find a laptop or PC that has Internet access (not connected to the Transport), open a browser, and specify the mobile IP address of the Transport.
 
If this fails, please verify that you have Web Server enabled (Configuration > Network > Network Services).  Having IP Forwarding (Configuration > Network > IP Routing/Forwarding > IP Port Forwarding/Static NAT Mapping) or IP Passthrough (Configuration > Network > IP Passthrough) enabled could affect these results as well.  Otherwise, if you cannot access your Transport remotely, the issue could be that you have a mobile originated account or a private account.  You should check this with your provider.
 

Mobile Originated vs. Mobile Terminated
 
Mobile Origination – Allows for outbound data to pass through the Digi and receive responses from the data request, but it does not allow for data originating from the Internet to pass through the Digi or to devices beyond it.
 
Mobile Termination – Allows for 2-way communication of data, where data from the Internet can reach the Digi and beyond, and data from the Digi can go to the Internet.
 


Troubleshooting
Ensure you are on the latest firmware
Updating your firmware may resolve your issue as well as enhancements to both your Transport and traces for troubleshooting.

1. To check your firmware, go to Administration > System Information and note your Firmware Version
2. Compare the firmware version to our latest release by going to www.digi.com > Support > Firmware Updates
3. Enter your Transport Model (i.e. WR21) in the field and then click on your particular model
4. It should bring you to a page for your product. Choose the fimrware for the type of upgrade you will performing, either via FTP (WebUI) or FlashWriter, from the options on the page and save the file to your PC.
5. Please follow “TransPort Firmware Upgrade Instructions” that is available under the General Firmware page listed above.

 
When contacting Digi Technical Support
To contact Digi Technical Support, please call 952-912-3456 or email tech.support@digi.com.  If you already have a Tech Support case number, please reference this number when contacting Support.
 
Please provide the debug.txt file.  You can gather this either via FTP or the WebUI by going to Administration - File Management > FLASH Directory, right-click on debug.txt and select Save Target As (or whatever term your browser uses).  For more details see http://ftp1.digi.com/support/documentation/QN_024_Extracting%20the%20debug.txt%20file%20from%20a%20Digi%20TransPort%20or%20Sarian%20router.pdf.