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

 

 

 

 

 

 

 

 

 

43

 

 

 

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Troubleshooting