Technical Reference for ZyXEL omni.net series
A-1
Appendix A
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 omni.net is used just like an ordinary ISDN TA. The DTE interface will be
either in command state or in data state. At the 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.
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