Hello Dianafern,
Good day. Thank you for your question.
For the CSQ value, please refer below:
CSQ >= 99, or CSQ <= 1, GSM = 0
CSQ < 6, GSM = 1
6 <= CSQ < 10, GSM = 2
10 <= CSQ < 15, GSM = 3
15 <= CSQ < 20, GSM = 4
20 <= CSQ < 99, GSM= 5
So, for example, the range for each of the values will be as follows:
GSM = 0 : RSSI >= -111 dBm or less, not known or not detectable
GSM = 1 : RSSI < -101 dBm
GSM = 2 : -101 dBm <= RSSI < -93 dBm
GSM = 3 : -93 dBm <= RSSI < -83 dBm
GSM = 4 : -83 dBm <= RSSI < -73 dBm
GSM = 5 : -73 dBm <= RSSI < +91 dBM
Please go through this and let me know if it helps.
Kind regards.