User manual

B) Additional hints
❏ Is the antenna properly connected?
➫ For GSM 900 : use a 870 to 960 MHz / 50 Ohms antenna.
➫ For GSM 1800 : use a 1710 to 1880 MHz / 50 Ohms antenna.
➫ For GSM 1900 : use a 1850 to 1990 MHz / 50 Ohms antenna.
❏ Is the received signal strong enough?
➫ With the AT-Command AT+CSQ check that the received signal (1
st
parameter of the response) is strong
enough to be able to establish a call.
* based on general observations.
❏ The modem always returns «No carrier» when trying to issue a voice communication?
➫ Insure the character «semicolon» is present straight after the phone number on the AT-Command
ATD######;
❏ The modem always returns «No carrier» when trying to issue a data communication?
➫ Insure the selected bearer type is supported by the called party.
➫ Then, insure the selected bearer type is supported by the Network.
➫ If no success, try bearer selection type: AT+CBST=0,0,3.
➫ Insure the SIM Card is available for Data/Fax calls.
TROUBLESHOOTING
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GUIDE 19/04/99, 9:2218