User guide

Chapter 2: Installation & Activation
Multi-Tech Systems, Inc. MVPGSM 12
Note about Wireless Bands
The wireless units inside the MVPGSM support quad band frequencies (850/1900/900/1800 MHz). In reality,
these operate like dual, dual-band devices. In other words, they can be configured for 850/1900 or
900/1800 MHz. They do not auto-seek the local area frequency.
Should you need to change the default band setting, follow the instructions below:
Go to Configuration | Wireless Setup | Interface Parameters.
Type AT+WMBS=<Band><Param> into the Modem InitString1 box.
For <Band>, enter the option you desire:
4 = Dual-band mode 850/1900MHz
5 = Dual-band mode 900/1800MHz
For <Param>, enter the option you desire:
0 = Modem must be reset in order to use the specified band(s). This is the default.
1 = Modem restarts immediately using the specified band(s).
Example:
AT+WMBS=4,0
Click the Copy Channel button and both channel boxes, then click the Copy button.
Click OK on the Interface Parameters screen.
Go to Save Setup | Save & Reboot and click OK.
The MVPGSM will save the settings and reboot. Once the MVPGSM has rebooted, check to make sure the
wireless units can connect. You may now go to Configuration | Wireless Setup | Interface Parameters and
remove the AT+WMBS command from the Modem InitString1 and select the ‘copy to all’ button to make the
change for all channels and then click the Copy button. Then you can click OK on the Interface Parameters
screen and use the Save & Reboot option one more time. There is no need to have the MVPGSM send the
+WMBS command every time it initializes an internal modem, so we are reversing the process detailed
above.