Table of Contents
Advertisement
How can verify GSM signal quality in the place where the monitor is?
CSQ command (Check Signal Quality) allows verifying the GSM signal
quality in the place where the area monitor is. In addition to the possibility to
send this command, with the syntax #SM?CSQ*, in the log file, every time
the area monitor switch the modem ON, before than its switching OFF, a
verification of the GSM covering, is done.
For very connection there will be a string like this:
17/05/18 15:06:36 +CSQ: 19,99
There is the date, hour, the command and a result expressed with 2 numeric
values.
The first value, 19 in this example, corresponds to the signal quality value
(RSSI) expressed in dBm.
Values
from 2 to 9
from 10 to 14
from 15 to 19
from 20 to 30
31
The second value, 99 in this example, is the bit rate error
Values
0
1
2
3
4
5
6
7
99
dBm
from -109 to -101
from -93 to -85
from -83 to -75
from -73 to -53
-51 or higher
Meaning
less than 0.1%
from 0.26% to 0.30%
from 0.51% to 0.64%
from 1.0% to 1.3%
from 1.9% to 2.7%
from 3.8% to 5.4%
from 7.6% to 11.0%
more than 15%
non detectable
Troubleshooting
Quality
Poor
Enough
Good
Excellent
Excellent
7-13
Advertisement
Table of Contents
