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AC75 AT Command Set

2.14 AT^SCFG

AC75_ATC_V01.002 Page 68 of 569 10/30/06

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Preferred radio band(s)

The write command will trigger the band selection, starting with the user preference specified by <rbp>. This

means bands contained in <rbp> will be searched first, regardless of the standard band combination of the cur-

rent country. The final result of the band selection can be read from <rbc>.

If <rbp> was a band or band combination which differs from the standard band(s) and the requested band(s)

are not visible at the air interface the ME reverts to the standard band(s) of this country. Please note that the

band selection procedure is independent of the registration procedure, i.e. the ME selects a band no matter

whether or not there is a PLMN (Public Land Mobile Network) the ME can register to. So, if the <rbp> was a

band or band combination supported by the country, but currently no PLMN can be found, the ME will select the

"preferred" band (indicated by <rbc>) without registering to the network. To avoid registration problems, for

example when the settings are configured for testing the GSM application it is recommended that the tester first

activates the desired band(s) on the test equipment and then executes the AT^SCFG write command. Besides

remember that the network registration also depends on the settings made with AT+COPS.

The <rbp> is volatile and cannot be read back with the AT^SCFG read command. This is because the value is

used only for triggering one single search operation.

The parameter <rbp> may be one of the single bands or one of the four dualband combinations listed below.

All preferred bands must be contained in the range of allowed bands set with <rba>, invalid combinations are

not accepted. To give priority to a certain single band or band combination and suppress all others simply select

the same value both for <rbp> and <rba>.

The value range of <rbp> is "1...12", but only the bands or band selections listed below are allowed. Trying to

set an unsupported value will be denied with "ERROR". To select or deselect a band calculate the sum of the

values of all desired bands and enter the resulting value. For example, for GSM 1800 MHz (2) and GSM 850

MHz (8) please enter the value (10).

“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

Currently selected radio band(s)

<rbc> is the single band or dual band combination currently used by the ME, found either by the automode

algorithm or after the network search was triggered with <rbp>. The <rbc> value is saved on power down.

When restarted next time the ME tries to select the same band(s) if these are visible. If the band(s) stored with

<rbc> are not visible the ME uses the standard band(s) of the current country and consequently updates the

<rbc> value.

<rbc> is only a response parameter returned either after sending the read command AT^SCFG? or writing

AT^SCFG="Radio/Band".

In addition to <rbc> and to allow the subscriber to be notified whenever the selected band changes it is recom-

mended to activate the "

+CIEV: band" (see Section 3.3, AT^SIND).

“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

<rbp>

(str)(+CSCS)

<rbc>

(str)(+CSCS)

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