Specifications

Chapter 8 – Network Service Commands
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 97
3 Registration denied
• Authentication or registration fails after Location Update Reject due to one of the following:
∗ #2 ... IMSI unknown at HLR
∗ #3 ... Illegal MS
∗ #6 ... Illegal ME
Either the SIM or the MS or the ME are unable to log into any network. No further attempt is
made to reach or log into a network. User intervention is required. Emergency calls can be
made, if any network is available.
4 Unknown (not used)
5 Registered; roaming. The ME is registered at a foreign network (national or international network)
<lac>
Two byte location area code in hexadecimal format (e.g., “00C3” equals 193 in decimal).
<ci>
Two byte cell ID in hexadecimal format.
Example:
AT+CREG=2 Activates extended URC mode.
OK
AT+COPS=0 Forces ME to automatically search network operator.
OK
+CREG: 2 URC reports that ME is currently searching.
+CREG: 1,”0145”,”291A” URC reports that operator has been found.
8.5 AT+CSQ Signal Quality
Description: The AT+CSQ execute command indicates the received signal strength <rssi> and the
channel bit error rate <ber>.
Test Command Syntax: AT+CSQ=?
Response: +CSQ: (list of supported<rssi>s), (list of supported<ber>s)
OK
Exec Command Syntax: AT+CSQ
Response: +CSQ: <rssi>,<ber>
OK
Parameter Descriptions:
<rssi>
0 -113 dBm or less
1 -111 dBm
2..30 -109... -53 dBm
31 -51 dBm or greater
99 not known or not detectable
<ber>
0..7 as RXQUAL values in the table in GSM 05.08 section 8.2.4.
99 not known or not detectable
Note: After using network related commands such as AT+CCWA, AT+CCFC, AT+CLCK, users are advised to wait
3s before entering AT+CSQ. This is recommended to be sure that any network access required for the
preceding command has finished.