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WA_DEV_FEX20_UGD_002
Rev 002
April 26, 2010
78
Fastrack Xtend User Guide
Communicating with the Fastrack
Xtend
For more information about these AT Commands and their associated parameters, refer to document
[7] Firmware 7.4a
AT Commands Manual (Sierra Wireless Software Suite 2.31)/Firmware 7.4 AT
Commands Manual (Sierra Wireless Software Suite 2.30).
9.2. Verifying the Received Signal Strength
The Fastrack Xtend only establishes a call if the received signal strength is strong enough. Using a
communication software such as HyperTerminal, enter
AT+CSQ
to check the received signal
strength. The response returned will follow the format
+CSQ: <rssi>, <ber>
where:
<rssi> = received signal strength indication, and <ber> = channel bit error rate.
Refer to the table below for the description of the <rssi> values returned.
Table 52: <rssi> Value Description
<rssi> Value
Description
0 – 10
Received signal strength is insufficient.
11 – 31
Received signal strength is sufficient.
32 – 98
Not defined.
99
No measure available.
9.3. Verifying the Network Registration
Using a communication software such as HyperTerminal, enter
AT+CREG?
to verify the network
registration of the Fastrack Xtend. Refer to the table below for the list of main responses returned.
Table 53: AT+CREG Main Reponses
AT+CREG Response
Description
+CREG: 0, 0
Not registered.
+ CREG: 0, 1
Registered on the home network.
+ CREG: 0, 5
Registered on a roaming network.
If the Fastrack Xtend is not registered on the network, do the following:
Check the connection between the Fastrack Xtend and the antenna.
Verify the signal strength to determine the received signal strength (Refer to section 9.2
Verifying the Received Signal Strength).
Refer to document [7] Firmware 7.4a
AT Commands Manual (Sierra Wireless Software Suite
2.31)/Firmware 7.4 AT Commands Manual (Sierra Wireless Software Suite 2.30) for more information
regarding the
AT+CREG
AT Command, and other AT commands relating to network registration in
GPRS mode.
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