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Circuit Switched Data (CSD)
Data transfer over Circuit Switched Data (CSD) is possible. Once the connection is established, data
can be transferred to and from the remote side.
CSD operation enables the terminal to perform a data transfer over a circuit switched link. It enables
the user to:
Connect to a remote modem without any Internet network involvement.
Own a real IP address and enable its access by connecting to an external ISP.
The following are examples of standard CSD call uses:
Connecting an Internet Service Provider (ISP).
Remotely accessing corporate Intranet via Remote Access Server (RAS).
User specific protocol, where the user defines both the remote and local sides.
The SMC-CDMA working modes can be divided into two modes of operation.
Data Mode: In this mode, once the SMC-CDMA has established a link with the remote modem, it
does not respond to any data passing through it (except for the Escape Sequence search). The SMC-
CDMA becomes a transparent link, connecting the terminal with the remote side.
Command Mode: In this mode, the SMC-CDMA responds to the AT commands issued by the
terminal. This is the default working mode.
Note: It is possible to switch between the operating modes.
The Terminal mode allows you to instruct the modem to dial a remote modem by issuing the Dial
command followed by the phone number. You can also include dial string modifiers, such as ―,‖ for
pause, in your command line to give the modem additional instructions.
Содержание SMC-CDMA Series
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