Today, I spent time for cleaning all wires connected to the server.
first of all, I enable the serial console for managing it without any network setting.

and I enable the USB device modules.

My wireless USB device is
Buffalo Ralink RT2870

Fortunately, it is supporting the linux. so I can easily install it on my server :D

and I set-up the wireless setting. Ralink RT2870 has its own configuration file. kernel module loads that file automatically and enabling wireless as a wired network card.

Thanks to that module, network card enabling script can be so simple.
it just enables the ra0 like the eth0.. (you know what I'm saying :)

After set all this things, I can close the door of my room and server.
There is no moer noise of fan of CPU and POWER... ;^)

moreover, I can manage my server without monitor, because of serial... :)