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and <sri> indicates the SBD ring indication status:
0
No SBD ring alert received
1
SBD ring alert received
Note: It is valid for the A3LA-R/RM/RGS to receive a telephony ring alert and an SBD ring alert
at the same time. Assertion of the RI signal indicates only the presence of an alert; this
command may be used to determine the type(s) of ring alert.
A.8.96 +CSQ[F] – Signal Quality
Exec Command: +CSQ[F]
Execution command returns the received signal strength indication <rssi> from the A3LA-RG.
Response is in the form:
+CSQ: <rssi>
where <rssi> is:
0
Equivalent to 0 bars displayed on the signal strength indicator
1
Equivalent to 1 bar displayed on the signal strength indicator
2
Equivalent to 2 bars displayed on the signal strength indicator
3
Equivalent to 3 bars displayed on the signal strength indicator
4
Equivalent to 4 bars displayed on the signal strength indicator
5
Equivalent to 5 bars displayed on the signal strength indicator
Note: The +CSQ form of the command waits for an updated signal strength reading to become
available. This will usually be within two seconds of issuing the command. If the A3LA-RG is in
the process of acquiring the system, or in a satellite handoff, a delay in response of up to 10
seconds may be experienced.
If the A3LA-RG has no SIM, is awaiting a SIM PIN entry, has an invalid SIM, or has otherwise
not proceeded to successful registration, the delay in response may exceed the 50 second
timeout limit. Under such condition, an ERROR response will be received. To avoid a delayed
response due to registration problems, issue the +CREG command to verify registration prior to
entering the +CSQ command to obtain signal strength.
Note: The +CSQF form of the command returns immediately, reporting the last known signal
strength.
Test Command: +CSQ=?
List the supported signal strength indications. The response is in the form:
+CSQ: (supported <rssi>s)
A.8.97 +CULK – Unlock
Exec Command: +CULK=<unlock key>
Unlock the SBD functionality of the A3LA-RG after it has been locked by the Gateway. The
unlock key must be obtained by contacting Iridium’s customer support.
<unlock key>:
0000000000000000 .. FFFFFFFFFFFFFFFF (a string of 16 hexadecimal digits)