4-10 Netopia ISDN Modem User’s Guide
If the D channel LED indicates a proper connection to the ISDN switch by turning off and you are using Windows, you can use your communications software to establish an ISDN connection. Go to the next section to place calls using your ISDN modem.
If the D channel LED indicates a proper connection to the ISDN switch by turning off and you are using Windows 95, to complete the Windows 95 installation see the “Installing the Windows 95 modem driver” section on page
If the D channel LED indicates a proper connection to the ISDN switch by turning off and you are using Windows NT, to complete the installation see the “Installing the Windows NT modem driver” section on page
Placing calls with Windows
To place calls using Windows, you can use any standard communications application that recognizes AT commands.
Note: Most areas require you to dial ISDN calls with 11 digits (for example,
Note that you must use Multilink PPP to make calls using two ISDN B channels. For information. see the “Using Multilink PPP” section on page
Installing the Windows 95 modem driver
If you are using Windows 95, you need to install a modem driver for your ISDN modem before you can place calls. Follow the instructions below to install the Windows 95 modem driver.
Note: The serial port speed of most PCs limits the computer’s maximum data transmission rate. Typically, PCs are limited to a maximum transmission speed of 115.2 Kbps. However, advanced serial cards and drivers are available to boost the serial port speed up to 230.4 Kbps. (For more information, see the “Optimizing serial port performance” section on page
