User manual

15Wavecom WMOD2B Modem
TROUBLESHOOTING
B) Additional hints
❑ Is the antenna properly connected?
Use an antenna with the following features:
➫ Frequency range : dual-band GSM 900/1800 or 900/1900 MHz.
➫ Impedance : 50 Ohms.
➫ Gain (antenna + cable) : 0dBi.
➫ VSWR (antenna + 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).
AT+CSQ response Signal quality
(RSSI)
11 to 31 ➞ Should be sufficient*
0 to 10
and +99
➞ Could be insufficient*