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Chapter 4 - Troubleshooting
MT128ISA/PCI
ISDN Log Error Messages
You may encounter the following runtime problems:
1. Cannot find CTL3D.DLL. This message indicates that your Windows system does not
support 3D graphics. The ISDN 128K driver will continue to execute normally without the
3D control graphic feature. You may contact your PC or system dealer to upgrade your
Windows system if you would like this feature.
2. Irq Selftest Fail. This message indicates the ISDN 128K VxD driver failed its IRQ self-
test. Check the IRQ values in System Resources by selecting Start>Setting>Control
Panel>System>Device Manager>ISDN card, ISDN PC Adapter>Resource.
The PC system may have a non-PnP device using the same IRQ number as ISDN 128K
adapter. This error is common in systems that have ISA bus sound cards installed using
IRQ5. If your system identifies an IRQ conflict, select another IRQ (probably both hard-
ware and software configurations) for this non-PnP device and reboot the system.
Windows 95 user can change the IRQ used by the ISDN card in the device manager by
using Start>Settings>Control Panel>System>Device Management>Multi-function
adapters>ISDN PC Adapter (Master Device)>Properties>Resources. Disable the Use
automatic settings option. Select Interrupt Request>Change Setting and select an
available IRQ value. If IRQ 5 is not available, IRQ 10 or 12 are often good choices.
Ensure the IRQ you select is not in use by another device.
3. Cannot find ISDN card. This message indicates the ISDN 128K VxD driver does not
find the ISDN 128K adapter when Windows starts. The problem may be associated with
an I/O address or IRQ clash during PnP initialization. Check your system resources as
describe in number 2 above. You may need to reinstall the ISDN 128K driver.