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Chapter 3 – Using Your Wireless modem
Multi-Tech Systems, Inc. MultiModem EDGE Wireless Modem User Guide 15
Chapter 3 – Using Your Wireless
Modem
Phone Number for the Wireless Modem
• Every wireless modem will have its own unique phone number provided by your wireless provider.
• The wireless modem’s phone number may simply be told to the subscriber or be on the SIM or both.
Wireless provider implementations may vary.
Examples of Useful AT Commands
A Note About HyperTerminal
In order to verify signal strength and roaming status, you must use a terminal application such as HyperTerminal. To
open this program in Windows XP or Windows 2003, go to Start > All Programs > Accessories > Communications
> HyperTerminal. Other Windows operating systems have similar paths to HyperTerminal. See your system’s online
Help if you cannot find it.
A Note About AT Commands
AT commands can be used to operate, configure, and query your modem. A reference guide to the EDGE commands
is included on the MultiModem CD and on the Multi-Tech Web site.
The following two commands let you query signal strength and roaming status.
Verify Signal Strength
Using HyperTerminal, type AT+CSQ
The modem 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
Checking Network Registration and Roaming Status
Using HyperTerminal, type AT+CREG?
The modem will respond in one of the following ways:
+CREG: 0,0 (this tells you that the modem is not registered on any network)
+CREG: 0,1 (this tells you that the modem is registered on the home network)
+CREG: 0,5 (this tells you the modem is registered on a network but it is roaming)
Note: If the modem is showing not registered, perform the procedure for verifying signal strength to determine
the strength of the received signal.
Checking the Modem’s Identity
Use the ATI command (Note: This command is illustrated using the capital letter i after AT)
• Type ATI
Product information displays. For example, Siemens MC75 Revision xx.yy (xx.yy is the software version)