Multi-Tech Systems MTCBA-G-UF1 ユーザーズマニュアル

Chapter 3 – Troubleshooting  

Multi-Tech Systems, Inc. MultiModem® GPRS with USB User Guide 

 

 

 

 

 

If the Wireless MultiModem returns a message of error upon an attempted transmission of data or voice 
signals, see the table below for possible causes and solutions. 

Solutions for “error” message situations 

If the modem 
returns 

Then ask … 

Action 

Error 

Is the modem registered on the 
network? 

Follow “Verifying network registration" procedure to 
be sure modem is registered on network. 

 

Is the modem receiving an 
incoming call or is it already in 
communication?

 

End any communication using the ATH command.

 

 

Does AT+CREG? return 0,1 
(registered) or 0,5 (registered 
roaming)?

 

If not, check for adequate signal strength on network. 
Use AT+CSQ. 

 

Is the selected bearer type 
supported by the called party? 
 
 
Is the selected bearer type 
supported by the network? 

In comm. program, type AT+CMEE=1 to view the 
extended error codes (see “Error Results Codes" in 
the AT Command guide).  
Be sure called party and network support selected 
bearer type. 
Be sure that semi-colon (“;”) is typed immediately 
after the phone number in the AT command. e.g., 
ATD######; 

 

Is the received signal strong 
enough? 

See “Verifying Signal Strength.”   

 

Is the antenna properly 
connected? 

See “Antenna/RF Specifications.”