Samsung NC10 User Manual page 184

If the AP is excessively far away, or
is installed at the end of a building
and you are attempting to use the
wireless LAN from the other end, you
may not be able to use the wireless
communication normally because
the signal is blocked by obstacles
between you and the AP (such as a
wall).
A2 Check if the AP operates properly. If
the AP is not operating properly, turn
it off and on again and try again.
A3 Check if the AP firmware is the latest
version. (For more information on the
AP firmware, ask the AP manufacturer
or your product provider.)
A4 Check if the AP is properly connected
to the network. Connect the LAN
cable from the AP to a computer and
check if the network is connected
properly.
A5 Check the Network Key (Encryption
Key) settings again. If the automatic
password converting function
(passphrase function) is enabled and
the wireless connection is normal
but you cannot send data over the
connection, please enter the Network
Key (Encryption Key) manually.
A6 Check the AP settings as follows.
If there are multiple APs running at
the same time, check the channel
setting of each AP. If the interval
between the channels of the APs
is narrow, you may experience
electromagnetic interference. Set the
channel numbers of the APs so that
the internals between the channels
are maximized. (for example, Ch1,
Ch, Ch, Ch1) computer.
It is recommended unselecting the
Hide option of the AP. SSID (Service
Set ID) is a name used to distinguish
a wireless LAN from other wireless
LANs.
It is recommended using Long
Preamble. Preamble is a signal for
data transmission synchronization.
Although some APs support
Short Preamble, there might be a
compatibility problem.
Because "Fixed" channel selection
is more stable then 'Auto' channel
selection, "Fixed" channel selection
is recommended. It is recommended
not using the "Block Any" and "Any
Connection Block" functions. Although
these functions block connections
at the client side when the network
name is Any or Blank, it may cause a
compatibility problem.
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