CTI Products PCLTA PCI Interface - Manual (Page 30)

PCLTA Installation Manual Troubleshooting
CTI Products, Inc.
68-11199-135
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9. Troubleshooting
As a “plug and play” type device, the PCLTA adapters should operate as desired
following completion of the installation process. If the adapter does not function
correctly, the most likely causes are system resource constraints or software
incompatibilities. These problems are described in detail in the following
sections.
9.1 Installing the PCLTA Adapter Before the Device Driver
If the PCLTA adapter was inserted into the PC prior to the PCLTA device driver
installation, the Windows operating system will be unable to associate a device
driver with the adapter. When Windows starts up, a “New Hardware Found”
window will appear. Click the Cancel button, then install the PCLTA device
driver as described above in Section 4, PCLTA Driver Software Installation.
If the option “Do not install a driver (Windows will not prompt you again)” was
inadvertently selected, the operating system will mark the PCLTA adapter as an
unknown device. As a result, the adapter will not function even if the PCLTA
device driver is installed. To correct this problem, “remove” the device using the
following steps:
a. Open the System control panel and select the tab labeled “Device
Manager”.
b. Double-click the “Other devices” icon.
c. Select “PCLTA” device and click the Remove button.
d. Install the PCLTA device driver as described in Section 4, PCLTA Driver
Software Installation.
9.2 System Resources
A PCLTA-10 adapter requires four contiguous bytes of I/O address space starting
on a modulo-4 based address (i.e., an address evenly divisible by 4). A PCLTA-
20 and 21 adapters require sixteen contiguous bytes of I/O address space. A
dedicated interrupt request is also required for each.
9.2.1 Solving IRQ and I/O Conflicts under Windows 95/98
I/O resource problems are rare under Windows for the PCLTA-10 and PCLTA-20
adapters since they can handle a wide range of I/O settings. However, IRQ
resource problems may occur more often in “multimedia” computers, which may
have very few spare IRQs. The Windows operating system handles most
allocations of IRQs, but there are some instances where the operating system
cannot properly allocate interrupt requests.
When the Windows Device Manager does not locate a free IRQ for a newly
inserted PCLTA adapter, it will not assign an IRQ to the adapter. As a result,
there may be not indication to the user that a problem has occurred, since no true