128 Appendix A Connecting a modem
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6 These setting must then be saved in the Modem NVRAM (Non Volatile Memory) so the
settings will become the modem power up defaults.
Note: If the settings are not saved and the modem is powered off and on, they will disappear,
and the modem will not communicate with a RAD until it is reprogrammed.
Preparing the remote modem
To prepare the remote modem, connect it to the computer. The Windows installation process puts
Terminal in the Accessories folder by default. Open Windows™ and from the Terminal
program:
1 Choose Settings from the pull down menu.
2 Choose Communications from the pull down menu.
3 Set the COM port to the port that has the modem connected using a compatible baud rate.
4 Click to return to the Terminal screen.
5 Enter the ATZ command. If OK appears, enter each command required to set the modem.
Note: If OK does not appear, the port is not configured correctly, the modem is not properly
connected, or is not powered on.
6 When you have entered the commands appropriate for the modem being used, exit the
Terminal Program. The modem is now ready to be hooked up to the remote RAD.
7 Enter the commands required to initialize the modem. Each command is terminated with a
carriage return. Refer to the Sample Configuration shown below.
Sample configuration
Nortel has tested a configuration using a Zyxel U-1496E modem connected to the RAD using the
following commands to program the modem:
AT&N3 // Force modem to make maximum 9600 baud
// Connects
ATS0=1 // This has modem auto answer on first ring
AT&S1 // This configures modem to control DSR
AT&D0 // This configures the modem to ignore DTR
AT&B0 // DTE/DCE rate follows link rate
AT&W // This instructs modem to write the new
// settings into NVRAM
Note: This is a sample, and will probably not work with any other type of modem. Refer to the
manual that came with your modem.
