wlan0     IEEE 802.11g  ESSID:"zyxel"
          Mode:Managed  Frequency:2.437 GHz  Access Point: 00:19:CB:23:55:39
          Bit Rate=1 Mb/s   Tx-Power=27 dBm
          Retry min limit:7   RTS thr:off   Fragment thr=2346 B
          Link Quality=51/100  Signal level=-56 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0