Chapter 2 – Activation and Installation
16
Multi-Tech Systems, Inc. MultiModem rCell User Guide
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.
1.
To Telnet to the modem. You can access the modem thru the Run icon or from the Command Prompt:
Click
Start I Run
icon. In the Open window, enter
cmd
and then press
ENTER
.
or
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
2.
In the command window, type
AT+CSQ
3.
The router responds with the received signal strength (rssi) and the channel bit error rate (ber).
RSSI ranges from 0 to 31. BER ranges from 0 to 7 (7 is the highest error rate).
Signal Strength – RSSI
10 – 31
Sufficient
0 – 9
Weak or Insufficient
99 Insufficient
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.
1.
In the command window, type
AT+CREG?
2.
The router will respond in one of the following ways:
Network Registration Verification
Value
Network Registration Status
+CREG: 0,0
The router is not registered on any network
+CREG: 0,1
The router is registered on the home network
+CREG: 0,5
The router is registered on a network and it is roaming
Note:
If the router indicates that it is not registered, verify the signal strength to determine if the problem is the strength of the
received signal.
Exiting Modem Mode
1.
After the last AT Command is entered, press:
CTRL + ]
(the right bracket).
2.
The following prompt displays:
telnet>
Type
quit
and press
Enter
.
3.
Then the following prompt displays:
c:>
Type
exit
and press
Enter
.