B) Additional hints
❏
Is the antenna properly connected?
Use an antenna with the following features:
➫
Frequency range
: dual-band GSM 900/1800 MHz.
➫
Impedance
: 50 Ohms.
➫
Gain (a cable) : 0dBi.
➫
VSWR (a cable) : -10dB.
❏
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.
5.4
Further questions
For further troubleshooting information, please check our Frequently Asked Questions on www.wavecom.com (customer
support section).
TROUBLESHOOTING
Wavecom WMOD2B Modem
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