ZyXEL Omni TA 128 User Guide - Page 29
ISDN Communication, Basics
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4 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 . 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 17