TRENDnet TEW-603PI - Manual (Page 41)

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Infrastructure Make sure that the AP and the associated computers are turned on and
working properly.
Make sure the TEW-603PI computer and the associated AP use the same
SSID.
Change the AP and the associated wireless clients to use another radio
channel if interference is high.
Make sure that the computer and the AP share the same security option
and key. Verify the settings in the Profile Security Settings screen.
Ad-Hoc (IBSS) Verify that the peer computer(s) is turned on.
Make sure the TEW-603PI computer and the peer computer(s) are using
the same SSID and channel.
Make sure that the computer and the peer computer(s) share the same
security option and key.
Change the wireless clients to use another radio channel if interference is
high.