Your output indicates that no IPv4 address has been assigned by the router.
You should now connect using the following commands if the router is issuing addresses by dhcp.
iwconfig rausb0 essid name_of_system
dhcpcd rausb0 (for wpa see below)
also use the following commands:
for a wpa based system set your wpa passphrase using
wpa_passphrase essid_name passphrase_here > /etc/wpa_supplicant.conf
then:
wpa_supplicant -B -Dwext -irausb0 -c/etc/wpa_supplicant.conf
dhcpcd rausb0



