At Command Set Reference; Operation Modes Of The Dte Interface; Simplex Mode; Multiplex Mode - ZyXEL Communications Omni TA128 User Manual

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AT Command Set
Reference

Operation Modes of the DTE Interface

There are two operation modes for the DTE interface:
• Simplex mode - used for conventional AT Command operation.
• Multiplex mode - used as an internal interface for ZyXEL CAPI
drivers.

Simplex mode

In simplex mode, the TA128 is used just like an ordinary TA. The
DTE interface will be either in the command state or in the data state.
At most, only one data connection session is possible at any time.
A number of different AT Commands can be used to invoke various
functions. The simplex mode is designed for AT Command users.
The guides and descriptions throughout the rest of this manual, if not
otherwise specified, are applicable to this mode. The power-on
default of the DTE interface is in simplex mode as well.

Multiplex mode

The multiplex mode is designed for ZyXEL CAPI drivers. It can also
be used by third parties to develop various drivers on different
platforms for public domain or for commercial purposes.
The commands or data are packetized. Each packet has its own
destination address. All the DTE channels can be accessed
individually by way of multiplexing.
Since it is not intended for all users, the specifications and manual for
the multiplex mode will be available in a separate text file, and will
only be available in the electronic format upon request.
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