ath0      IEEE 802.11g  ESSID:""
          Mode:Managed  Frequency:2.437 GHz  Access Point: Not-Associated
          Bit Rate:54 Mb/s   Tx-Power:18 dBm   Sensitivity=0/3
          Retry:off   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=45/94  Signal level=-51 dBm  Noise level=-96 dBm
          Rx invalid nwid:703  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0