CipherLab 8500 Reference Manual page 82

8500 Series Mobile Computer
While running echo tests, if WPA setting is enabled for security, the SSID and Passphrase
will be processed to generate a pre-share key.
Note: If you change the SSID or Passphrase, it will have to re-generate a pre-share key.
1) For initial association with an access point, you will see an antenna icon developing
on the screen to indicate that the mobile computer is processing a pre-share key.
2) After having generated the pre-share key, the mobile computer proceeds to establish
a connection with an access point, and you will see the whole antenna is flashing.
3) When the mobile computer has been connected to the access point successfully, you
will see the whole antenna and the indication of wireless signal strength.
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Reference Manual