Multi-Tech MultiModem EDGE Reference Manual page 36

<rba> Allowed Radio Band(s)
The parameters <rba>, <rbp> and <rbc> allow the subscriber to set and query preferences for selecting
frequency bands.
This device normally uses an automode algorithm designed to recognize automatically the radio bands of the
current country, typically a combination of two bands. Commonly used dual-band combinations are, for
example, 900/1800 MHz in European countries or 850/1900 MHz in North America. The standard radio band
combination of a country depends on the ARFCNs (Absolute Frequency Channel Number) and the MCCs
(Mobile Country Code) visible at the air interface. This enables the ME to easily find the standard band or band
combination of a country every time after power-up and, thus, usually eliminates the need for the subscriber to
make any changes. So, if automode is used and the allowed bands are not restricted with <rba> the response
parameter <rbc> shows the standard band(s) of the current area.
As an alternative, if any bands other than those automatically selected by the ME are needed, the automode
can be influenced using the AT^SCFG command. This may be necessary, for example, when running tests of
GSM applications, when access to specific radio bands shall be restricted or when the final product is not
intended for operation in certain countries.
Before changing <rba> or <rbp> ensure that no network activity occurs. The write command cannot be
executed when making a call or sending/receiving short messages.
Execution of the write command causes the ME to deregister from and re-register to the network, no matter
whether the selected <rbp> or <rba> setting really changes. Therefore, it is useful to have the URC "+CREG"
enabled.
Please note that <firstscan>=1 ("Radio/FirstScan" feature enabled) may override the settings selected <rba>.
The status of the SIM PIN authentication remains unchanged, eliminating the need to enter the SIM PIN again
after the change.
The parameter <rba> is intended to restrict the allowed bands to less than four bands. By default, all four
bands are allowed. Each band not contained in <rba> is generally disabled.
All bands of <rbp> must be contained in the range set with <rba>. The response parameter <rbc> will never
show a value outside the <rba> range. <rba> has precedence over <rbp> and <rbc>.
The <rba> value to select resp. deselect radio bands can be either a single band value or a multiple band
value as listed below. The multiple band values are calculated by adding up the appropriate single band
values.
Parameter <rba> is global for the ME, non-volatile and will not be reset by AT&F.
"1" GSM 900 MHz
"2" GSM 1800 MHz
"4" GSM 1900 MHz
"8" GSM 850 MHz
"3" GSM 900 MHz + GSM 1800 MHz
"5" GSM 900 MHz + GSM 1900 MHz
"10" GSM 850 MHz + GSM 1800 MHz
"12" GSM 850 MHz + GSM 1900 MHz
"15" all bands
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371G)
Chapter 2 – Configuration Commands
36