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Chapter 2 – Activation and Installation
AT Command for Verifying Signal Strength
To communicate directly with the cellular modem to verify signal strength, network registeration, and roaming status, telnet to
the modem.
To Telnet to the modem. You can access the modem thru the Run icon or from the Command Prompt:
1.
Click Start I Run icon. In the Open window, enter cmd and then press ENTER.
Click Start I All Programs I Accessories I Command Prompt
●
In the command window, type telnet 192.168.2.1 5000
●
At the Login prompt, type the default user name: admin (all lower-case). Press ENTER
●
At the Password prompt, type the default pass word: admin (all lower-case). Press ENTER
In the command window, type AT+CSQ
2.
The router responds with the received signal strength (rssi) and the channel bit error rate (ber).
3.
RSSI ranges from 0 to 31. BER ranges from 0 to 7
Signal Strength – RSSI
10 – 31
0 – 9
99
AT Command for Checking Network Registration and
Roaming Status
Use this command to verify that the wireless Router has been registered on a wireless network.
In the command window, type AT+CREG?
1.
The router will respond in one of the following ways:
2.
Network Registration Verification
Value
+CREG: 0,0
+CREG: 0,1
+CREG: 0,5
If the router indicates that it is not registered, verify the signal strength to determine if the problem is the strength of the
Note:
received signal.
Exiting Modem Mode
After the last AT Command is entered, press:
1.
CTRL + ] (the right bracket).
The following prompt displays:
2.
telnet>
Type quit and press Enter.
Then the following prompt displays:
3.
c:>
Type exit and press Enter.
16
or
Sufficient
Weak or Insufficient
Insufficient
Network Registration Status
The router is not registered on any network
The router is registered on the home network
The router is registered on a network and it is roaming
(7 is the highest error rate).
Multi-Tech Systems, Inc. MultiModem rCell User Guide
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