User guide

3GPP TS 27.007 AT CO
MMANDS
AT Commands for EV-DO-EV3 Modems
64
 Until the DTR line is ON, the module does not return back in the power saving condition.
 The power saving function does not affect the network behavior of the module, even during the power save
condition the module remains registered on the network and reachable for incoming calls or SMS. If a call
incomes during the power save, then the module wake ups and proceeds normally with the unsolicited
incoming call code.
 Reference: 3GPP TS 27.007.
Signal Quality +CSQ
Execute command reports received signal quality indicators.
Test command returns the supported range of values of the parameters <rssi> and <ber>. Although +CSQ is an
Execute command without parameters, ETSI 07.07 requires the Test command to be defined.
Syntax
Command Command type
AT+CSQ Execute
AT+CSQ=? Test
Execute command reports received signal quality indicators in the form:
+CSQ: <rssi>,<ber>
Where:
<rssi> Received signal strength indication.
0 (-113) dBm or less.
1 (-111) dBm.
2-30 (-109)dBm-(-53)dBm / 2 dBm per step.
31 (-51)dBm or greater.
99 Not known or not detectable.
<ber> Bit error rate (in percent).
0 Less than 0.2%.
1 0.2% to 0.4%.
2 0.4% to 0.8%.
3 0.8% to 1.6%.
4 1.6% to 3.2%.
5 3.2% to 6.4%.
6 6.4% to 12.8%.
7 More than 12.8%.
99 Not known or not detectable.
Notes
 Reference: 3GPP TS 27.007.