Wireless Issue -Dell Vostro 1520 - Fedora 13 (Broadcom corporation BCM 4312 802.11b/g (rev 01) )
#lspci
(with this command you can find the details)
First rum this command as a root user
# rpm -Uvh
http://download1.rpmfusion.org/free/...ble.noarch.rpm http://download1.rpmfusion.org/nonfr...ble.noarch.rpm
Now update the system.
#yum -y update
#yum -y install broadcom-wl
#yum install kmod-wl-PAE
After this reboot your system.
Hope your wirelss working.