No your CD isn't defective. A module is a driver.

The HiSax driver differs from the older Teles driver, particularly by a practical hardware check.
When the module can't be loaded there might be a hardware problem. I would look for the following:

Check /var/log/messages for messagesd relating to HiSax.
Possible error messages you might see:

HiSax: teles 16.3 config port d80-d88 already in use

The IO port is busy. Check with cat /proc/ioports.

kernel: HiSax: couldn't get interrupt 10

That would mean that the IRQ is busy or not responding.
------->If so try another free IRQ.
The port is not detected. The card is jumpered to 180 .

When you start ISDN config try this:
IRQ 11 IO 0xd80