Chapter 3 – Troubleshooting
Multi-Tech Systems, Inc. MultiModem® GPRS with USB User Guide 33
The modem is answering, but seems not to be doing anything. What’s the problem?
• The modem is answering in voice mode.
• If you are trying to make a data call, make sure the account has CSD service. You will also need the
data number (separate number from the main phone number given by the provider).
I am trying to make a data connection by dialing from my wireless modem to an analog modem. Why
does the analog modem answer and send tones, but never connect?
• To make a data call you must use the ATD<number> command.
• Make sure the account has CSD service.
How do I get the voice portion to work so I can talk to others using the wireless modem?
• You will need a cable that has the speaker pins connected to a speaker and mic.
• MTS offers a “Y” cable that splits out to an RJ10 connector. The RJ10 connector plugs into the receiver
of a handset.
How do I make a GPRS (Internet) connection using Windows?
• You must set the APN into the modem by using the command: AT+CGDCONT=1,”IP”,”<APN>” (APN is
given by the provider). This must be done using a terminal program.
• Create a dial-up connection in Windows to dial the number ‘*99***1#’ using no username or password.
• You can also use Mobile PhoneTools which will set the APN automatically and create a dial connection.
How do I make an Internet connection to my dial-up ISP?
• Make sure you have CSD service.
• Create a dial-up connection to the ISP’s access number. Then, using your account username and
password, choose the wireless modem as the device.
How does faxing work?
• You will need fax services set up on your account. You should receive a separate phone number for fax,
just as you have done for voice and data. You must call the fax number for the modem to receive a fax.
• You will also need a fax software package (not provided by MTS).
Why do I get garbage when I am in HyperTerminal and I try to connect to the GPRS network by sending
‘ATD*99***1#’? I have already set the APN correctly.
• HyperTerminal will only return garbage in this situation. You will need to use a PPP application instead.
The PPP application is needed to control the PPP session.
When I do ‘ATD*99***1#’ in HyperTerminal I get an error.
• Set AT+CMEE=1 and then try again to see what CME error is shown. Check the CME error in the AT
Command Reference Guide.
• Make sure the APN is programmed correctly into the modem by sending ‘AT+CGDCONT?’.
• Check ‘AT+CGCLASS?’, If it returns anything other than “B”, change it to “B” by setting
‘AT+CGCLASS=”B”’.
• Make sure that you have GPRS (packet switched data) service.
I can’t make any outoing calls and I have a solid LS light. I’m receiving a NO CARRIER response.
• Make sure the antenna is connected and the SIM is inserted correctly.
• Check signal and registration: ‘AT+CSQ’ (10-31 is good), ‘AT+CREG?’ (0,1 is registered & 0,5 is
roaming).
• Check NO CARRIER issue with ‘AT+CEER’. Look up error code in AT Command Reference Guide.