Electronic – What does the GSM AT+CSQ command output signify

at commandscellphonegsmmicrocontrollersim900

So the command returns the received signal strength(RSSI) and bit error rate(BER). I see that the RSSI is obtained even if the SIM card is not inserted in the GSM module. So what does RSSI signify?

AT+CSQ

+CSQ: 25,6

OK

Also how can we check if the network signals are available or not, when the SIM card is inserted in the GSM module?

Best Answer

According to this your Received signal strength is -63dBm. RSSI (=Received signal strength indication). As you say, you can receive RSSI without SIM (SIM IDs you in the network as a user so you can make calls. All the radio capabilities are in the phone, you can check the signal strength without the SIM).

For checking the available networks use:

AT+COPS=?
+COPS: [list of supported (,long alphanumeric,short alphanumeric,numeric[,])s][,,(list of supporteds),(list of supporteds)] +CME ERROR:
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