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Troubleshooting
43
Troubleshooting
7. Troubleshooting
■ First things to check
1. Check that the data cable is firmly connected to the terminal and to the compatible PC or other
compatible device.
2. Check that the power supply is firmly connected to the terminal and to an AC wall outlet.
3. Disconnect the power supply from the AC wall outlet before you check that the SIM card is installed
properly.
■ Poor reception
If there are problems with reception, for example interruptions in the service, the signal may be too
weak. Check the signal strength with the following AT command for example in the HyperTerminal
connection window: at+csq.
The response is +csq: <rssi>, 99. The parameters for <rssi> are from 0 through 31 at 2 dBm intervals:
0 ... 6 -101 dBm or less -> Unacceptable coverage
7 ... 11 -100 dBm ... -91 dBm -> Weak coverage
12 ... 16 -90 dBm ... -81 dBm -> Moderate coverage
17 ... 31 -80 dBm or greater -> Good coverage
99 Not known or not detectable