Windows NT* 4.0 fails to detect the modem during a scan of available COM ports
Resources used by the installed Infrared Port interfere with detection of the Xircom modem
Disable the Serial Infrared (IR) Device until after installing the Xircom network adapter. To do this:
1. Open Control Panel and then double-click Ports.
2. Note the listed COM ports, and then delete them, one-by-one. To do this:
a. Select a listed COM port.
b. Click Delete.
c. Repeat this process for each listed COM port.
NOTE: In dealing with IR Device issues, we would expect one or two COM ports listed under Ports. COM1 usually represents the laptop's physical serial port. A second COM port (COM2, COM3, or COM4), would be a good indication that an IR device is both present and active. The IR device may still be present in the hardware setup, even if a second COM port is not present.
NOTE: The presence of a third COM port may indicate that an Internal Modem is present. This too, will affect the Xircom
adapter installation. Disable this device as well.
3. Disable the serial or generic Infrared device. This can be done, in a couple of ways:
a. Using the manufacturer provided hardware setup utility.
If present, access the hardware setup utility through either an icon in the Control Panel or through the Windows NT Program Groups. For example - Toshiba provides a setup utility, which allows modifications to BIOS hardware settings without having to restart the computer to enter the System BIOS.
NOTE: The hardware setup utility offers the easiest and safest means of modifying hardware configurations defined in the system BIOS.
WARNING: The next step may require direct modifications to the System BIOS hardware setup. Incorrect selection of BIOS options may cause system failure. Consult the computer User's Guide for assistance with accessing and modifying the hardware settings contained in the system BIOS.
b. Directly access the system BIOS at start up or by using keystroke commands as defined in the computer User's
Review the BIOS options carefully. After disabling the Serial Infrared Device, select the option that allows you to exit the
BIOS, save all changes, and then restart the computer.
4. If you have not already done so, shut down Windows NT and turn of power (Cold Boot). Remove the Xircom adapter from the PCMCIA slot before restarting the computer.
5. Open Control Panel, and then double-click the Ports icon.
6. Verify that only the physical COM port (usually COM1) is listed. The presence of a second COM port would indicate that the IR device was not correctly disabled or that another condition exists that requires investigation.
7. With the Infrared device correctly disabled shut down the computer and remove all power (Cold Boot the computer).
NOTE: Consider the IR device disabled if no COM ports other than the physical COM port are listed under Ports; and the IR Device is not present under Devices in the Control Panel.
8. Insert the Xircom adapter into a PCMCIA slot and then start the computer.
9. Open Control Panel, and then double-click the Ports icon. Verify that a new COM Port exists. Windows NT generates this COM port in response to the presence of the Xircom adapter in the PCMCIA slot during computer start up.
10. Select the newly created COM port and then click Settings.
11. Select the Highest Connection Rate listed (usually 115,200 bps, but this value is driver dependent), and then click OK. Click Close to exit the applet and save changes.
12. Open Control Panel and then double-click Modems.
13. Click Add, and then click Next. The Modem Installation wizard scans the available COM ports for the Xircom modem.
14. The Modem Installation wizard may detect the Xircom modem on COMx (the next available COM port), but it is more likely that NT detects a Standard Modem on COMx. If a Standard modem is detected, do the following:
a. Click Change, and then click Have Disk.
b. Enter the path to the Xircom installation files, and then click OK.
15. Verify that the Modems Properties Window displays the Xircom modem. Close Modems and immediately test the Xircom modem. You can test the modem without restarting the computer.
If problems continue with the operation of the Xircom adapter, we recommend that you completely remove Xircom adapter installation from Windows NT 4.0. Xircom Knowledge Base articles exists, which detail the Windows NT 4.0 Clean Up Procedures for your adapter.
Microsoft Windows NT* Server 4.0, Microsoft Windows NT* Workstation 4.0
This applies to: