Isdn Communication Basics; Understanding At Commands - ZyXEL Communications Omni TA128 User Manual

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ISDN Communication
Basics
In this chapter, we will cover how to initiate and receive calls over
digital lines using your TA128.

Understanding AT Commands

AT commands are used to configure and control the TA128.
Command statements are usually sent to the TA by being typed from
the computer keyboard.
Command statements must be written in a specific form in order for
the TA128 to recognize them. A command statement begins with the
letters "AT" or "at". It is then followed by one or more commands
and then by <Enter>.
AT commands can only be issued when the TA128 is in "command"
or "off-line" mode.
Once the TA128 has established a connection with the remote
device, it goes into "on-line" mode, and the characters sent from your
computer (through the TA128) are transmitted to the remote device.
In order to issue an AT command statement, you first need to run
your communications software and configure it to the port connected
to the TA128. Refer to your communications software manual if this
is not the case.
Once the communication terminal program is running and the TA128
is connected:
Type:
AT<Enter>
TA128 responds:
OK
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