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ISDN AT COMMANDS
Besides using configuration utility as described in the previous section, you
can alternatively use ISDN AT command to configure and use the Intelligent
ISDN TA PC Card.
More specifically, AT commands are usually issued to the ISDN TA PC Card
to control the TA's operation and configuration. AT commands can only be
entered while the TA is in command mode. The format for entering AT
commands is:
ATXn ↵ ↵ ↵ ↵
where X is the AT command, and n is the specific value for that command.
↵ means pressing the ENTER button.
Any command issued is acknowledged with a response in either text or
numeric values. If the commands and command-values are correct, the OK
message will appear; otherwise ERROR message will prompt.
This chapter describes how to use the AT commands for the users who need
special parameters in order to meet their applications. Refer to the appendix
for the detailed ISDN AT command definition.
Using ISDN AT Commands
As mentioned above, you can use ISDN TA PC card through AT besides
except through communication software carefully every time, because they
can cause your software to loose its ability to control the modem. When you
do find any AT command causes ISDN TA maul-function, turn the computer
off and then on. That will reset most of the AT command settings to the
factory defaults.
In order to use an AT command, you need to have done the following:
1.
Run your communication software.
2.
Configure the software for the appropriate COM port and IRQ setting if
necessary.
3.
Enter terminal mode (aka command mode, local mode, or directmode.).
This is usually the mode that communications software starts up. Then,
type the AT command for you needs, then press Enter key. For example,
AT!C0=0<Enter> Set the ISDN TA to connect to AT&T
AT!Z=9<Enter>
AT&N0=0<Enter>
Mostly the AT commands can also be entered in the same command
line. For example,
AT!C0=0!Z=9&N0=0<Enter>
5ESS switch
Select async to sync PPP Conversion
Select Single-Link PPP mode
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