User Manual

Wi-Fi Settings
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• Disable: If there are no 802.11b clients in the network, the protection mode can be
disabled.
• CTS Only: The transmitting client sends only a CTS frame to prevent others from
accessing the medium. This mechanism is effective for most neworks with mixed
802.11g and 802.11b clients.
• RTS/CTS: Both RTS and CTS frames must be exchanged before a client can send
data. There may be 802.11b clients in some networks that do not detect the CTS
frames from other stations. The full RTS/CTS exchange should solve most
connection problems, but it also has the greatest impact on network performance.
Preamble Length – All IEEE 802.11 frames begin with an alternating pattern of 1s
and 0s called the preamble, which tells receiving stations that a frame is arriving.
This provides time for the receiving station to synchronize to the incoming data
stream. This parameter sets the length of the signal preamble that is used at the
start of a data transmission. Using a short preamble (96 microseconds) instead of a
long preamble (192 microseconds) can increase data throughput on the unit, but
requires that all clients can support a short preamble. (Default: Short)
• Short: Sets the preamble to short for increased throughput.
• Long: Sets the preamble to long. Using a long preamble ensures the unit can
support all 802.11b and 802.11g clients.
SSID Suppress – When enabled, the OD200 stops broadcasting the configured
SSID in its beacon signal. The unit is configured by default as an “open system,”
which broadcasts a beacon signal including the configured SSID. Wireless clients
with a configured SSID of “ANY” can read the SSID from the beacon, and
automatically set their SSID for immediate connection to the OD200. When enabled,
the unit does not include its SSID in beacon messages. This provides a basic level
of security, since wireless clients must be configured with the SSID to connect to the
OD200.
Factory Default – Click the Reset button to set all the Wi-Fi settings to their factory
default values.
Wireless Security
The OD200’s Wi-Fi interface is configured by default as an “open system,” which
broadcasts a beacon signal including the configured SSID. Wireless clients with a
configured SSID of “ANY” can read the SSID from the beacon, and automatically set
their SSID to allow immediate connection to the wireless network.
To implement wireless network security, you have to employ two main functions:
• Authentication – It must be verified that clients attempting to connect to the network
are authorized users.