Multi-Tech MultiModem EDGE Reference Manual page 37

<rbp> 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
current 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 dual band 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>.
"1"
"2"
"4"
"8"
"3"
"5"
"10"
"12"
<rbc> 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
recommended to activate the "+CIEV: band" (see Section 3.3, AT^SIND).
"1"
"2"
"4"
"8"
"3"
"5"
"10"
"12"
<cns> Continuous Network Search Mode
This parameter can be used to influence the time the ME takes to register to the network.
Parameter is global for the ME, volatile and will not be reset by AT&F.
"0" Normal. Default.
When trying to register to a network the ME sleeps longer than in "Fast mode" before
restarting a network scan.
"1" Fast
"Fast mode" reduces the time the ME sleeps before restarting a network scan when trying to
register.
Advantage: If the ME is out of network service it may take less time to find a network.
Disadvantage: Higher current consumption while the ME is out of network service.
To monitor the search process it may be useful to have the "+CREG" URC enabled. Each time the
Note:
network search starts, the URC "+CREG" equals "2" (searching). When the network search stops, the
URC is issued again, indicating either "0" (not registered), or "1" (registered) or "5" (registered,
roaming). As long as no network can be found, the URC will be toggling between "2" and "0".
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371G)
GSM 900 MHz
GSM 1800 MHz
GSM 1900 MHz
GSM 850 MHz
GSM 900 MHz + GSM 1800 MHz
GSM 900 MHz + GSM 1900 MHz
GSM 850 MHz + GSM 1800 MHz
GSM 850 MHz + GSM 1900 MHz
GSM 900 MHz
GSM 1800 MHz
GSM 1900 MHz
GSM 850 MHz
GSM 900 MHz + GSM 1800 MHz
GSM 900 MHz + GSM 1900 MHz
GSM 850 MHz + GSM 1800 MHz
GSM 850 MHz + GSM 1900 MHz
Chapter 2 – Configuration Commands
37