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CHAPTER 3
Redwing CDMA for Sprint - User Guide, version 2.31
Circuit- Switched Configuration
The Redwing does not have any internal intelligence nor does the Redwing C3110 or C3116
have the ability to SAVE individual settings like a conventional modem (the Redwing C3111 can
save settings internally). Therefore, the best machines for use in circuit-switched mode are ones
that can provide their own INIT or setup strings and/or issue AT commands.
However, for customers who have unintelligent machines who still need to have the modem 'ready'
to behave in a certain way (such as Auto-Answering circuit-switched data calls), there is a feature
in the modem called the INIT STATE.
Crcuit-switched configuration requires a voice plan (account) with your car-
Note:
rier, not a 1xRTT data plan. 1xRTT features are not compatible with the circuit
switch configuration. Voice plan speeds are generally lower than those of a data
plan. It is generally not easy to switch from one plan to the other.
INIT State
The INIT STATE is a state where the modem will initialize itself by using a single pre-determined
concatenated Auto-INIT command string. In some models of the Redwing, the Auto-INIT is actu-
ally an AT command itself, called +ATINIT. Since the Auto-INIT takes the shape of traditional
INIT strings, those with experience setting up conventional land-line modems should find this
fairly easy to configure.
The Auto-INIT command string is comprised of up to 40 characters, the order defining the
sequence of the initialization. The command sets the modem for the desired 'ready' configuration
each time it powers on.
Configuring Circuit-Switch
To configure the modem for circuit-switch communication, you will need to use AT commands
(page 22). You will need to use direct serial communication to enter the commands for the Red-
wing
Different models of the respond to some of the AT commands in different ways, a command
which is used with one model may not be applicable to another.
The model number of your modem is on the label on the top of the case (example,
Redwing CDMA C3110).
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