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Lucent WaveLAN/ORiNOCO Card Fails to Communicate in Windows NT4.0

This problem only occurs on some PC's running Windows NT version 4.0

The Lucent WaveLAN/ORiNOCO wireless LAN card may fail to connect properly to the access point even though the installation appears to be correct, the "Radio connection show "Excellent" and the Client Manager status panel and shows no problems, the symptoms are: 

  1. The ORiNOCO Client Manager fails to read the Access Point name, but it may correctly identify the MAC address of the Access Point.
  2. DHCP fails to work on the client machine and IP addresses are not allocated to the WLAN card.
  3. PING's to other known machines on the network fail with "Request timed out".

ORiNOCO Client Manager screenshot

ORiNOCO Client Manager screenshot

More Information

There appears to be an interrupt latency issue with the Lucent WaveLAN/ORiNOCO driver and hardware.

Work Around

Set the WaveLAN/ORiNOCO WLAN card to use the same IRQ as the PCMCIA adapter by setting the ManagmentIRQ registry key. This will minimise the IRQ latency of the system. This registry patch file sets both the card and PSeries adapter to use IRQ 10, you may need to edit this file to suit your system. Install the patch by clicking on the link, then reboot your machine.

THIS PATCH SHOULD ONLY BE APPLIED TO SYSTEMS RUNNING WINDOWS NT4.0

On a working system you should see the Access Point name like this image :

ORiNOCO Client Manager screenshot showing the access point on a working system

and you should be able to PING other machines on your network.