after my search on different search engines failed, I finally try in this way to get a solution to my problem.
The problem seems to be a start problem. I have a Cisco PCMCIA WLAN 802.11b card of 350 series. Every thing is installed properly (i hope so). If I insert the card into my Linux (Redhat 8) laptop, drivers are initialising properly. But if I use the inbuit tool "iwconfig" and check the entries of the interface, I get ESSID " " and AP as FF:FF:FF:FF:FF:FF. Things are not functioning good. I even tried to set AP or ESSID using iwconfig, but no success.
BUT, if I just start cisco tool "ACU" and close it, without doing any thing (just start and exit) then things are functioning good and I don't have any problem with the card and its assosiation to the AP.
I would be happy to solve this problem as it is creating some times headace, if I want to write my own tools.
Thanking you in advance,