Specifications

Chapter 2 – Configuration Commands
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 33
The parameter <rba> determines the maximum range of the bands allowed. The value may be one of the
single bands listed below or all valid combinations from the values 1, 2, 4 and 8. Thus, the value range of
<rba> is “1”..”15”. To select or deselect a band calculate the sum of the values of all desired bands and enter
the resulting value. For example, for 1800 MHz (2) and 850 MHz (8) please enter the value (10).
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
<rbp> Preferred Radio Band(s)
The parameter <rbp> may be one of the single bands or one of the four dual-band combinations listed below.
All preferred bands must be contained in the range of allowed bands (see <rba>), invalid combinationsare 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>.
<rbp> primarily serves to trigger the network search; i.e., it is only used one time for searching and selecting a
network. As the currently used band depends on the availability of the allowed networks, the value indicated by
<rbc> may be different from <rbp>. Also, the next time a network search is necessary (for example, after restart)
the ME will first try to reselect the network last used, which may be different from the value of <rbp> last given.
Therefore, the setting of <rbp> will not be saved.
The value range of <rbp> is “1...12”, but only the band(s) 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
<rbc> Currently Selected Radio Band(s)
The band(s) indicated with <rbc> are all allowed bands found at a location area. This means, if prompted to
select a network the ME will search for these networks only. The value can be either a single band or a dualband
combination.
<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
recommended to activate the “+CIEV” (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
“10“ GSM 850 MHz + GSM 1800 MHz
“12“ GSM 850 MHz + GSM 1900 MHz
<ropr> Radio Output Power Reduction
According to 3GPP Rel99, output power reduction for multiple TX slots is a mandatory feature. The amount of
power reduction is configurable up to 3.0dB for 2TX, 4.8dB for 3Tx to 6dB for 4TX. To optimize heat dissipation,
power consumption, and SAR values, it is recommended to use full power reduction (value “3”).
The parameter is global for all interfaces, non volatile, and will not be reset by AT&F.
“1“ Medium Reduction at GMSK and 8PSK (0dB for 1TX and 2TX, 1.8dB for 3TX and 3dB
reduction 4TX
“2“ Medium Reduction at GMSK (1TX 0dB, 2TX 3dB, 3TX 4.8dB and 4TX 6dB reduction) and
Full Power at 8PSK (1TX and 2TX 0dB reduction)
“3“ Maximal Reduction at GMSK and 8PSK (1TX 0dB, 2TX 3dB, 3TX 4.8dB and 4TX 6dB
reduction). Default.