I agree with peterberger, it's not work Intel N6230 with dell laptops. I thinking change wireless card to Atheros also. Just quick question to peterberger: did you have problem with sound: Stuttering/Buzzing Sound During Audio/Video Playback link to this problem: en.community.dell.com/.../19412524.aspx
because I got this problem also on my XPS 14z but some people fixed when they disable the wireless card. I have did disable on wireless card but still have a problem with sound just maybe not that often when wireless card was enable. So maybe if you make change Intel N 6230 to Atheros it will fix both problems: wireless signal and sound?