Technical Reference for ZyXEL omni.net series

Chapter 4

ISDN Communication Basics

This chapter covers how to initiate and receive calls over digital lines using your ZyXEL omni.net

ISDN TA.

Understanding AT Commands

AT commands are used to configure and control the omni.net by typing the command statements at the computer or terminal keyboard. Command statements must be written in a specific form in order for the omni.net to recognize them. A command statement begins with the letters string [AT] or [at], followed by one or more alphanumeric commands (a set of letters and numbers) and then ended by pressing <Enter>, as shown in the following examples.

Examples of AT Commands

 

Type

 

 

Operation

 

 

 

omni.net

 

 

 

 

 

 

 

AT Command

 

 

 

 

 

Response

 

 

 

 

 

 

 

 

 

AT<Enter>

 

To verify that the omni.net is

 

 

 

 

 

 

 

online with your terminal or

 

 

OK

 

 

 

 

computer.

 

 

 

 

 

 

 

 

 

 

ATCL?<Enter>

 

To inquire about the current

 

Maximum user data length in packet:

 

 

 

 

setting of the packet length or

 

 

 

 

 

 

 

frame size.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 19. Examples of AT Commands

AT commands can only be issued when the omni.net is in command or off-line mode.

Once the omni.net has established a connection with the remote device, it goes into on-line mode,

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