SMC Networks SMCWUSBS-N - Manual (Page 28)

Configuration
3-4
- Infrastructure – An integrated wireless and wired LAN is called an
Infrastructure configuration. Select Infrastructure to associate to an AP.
• Power Save Mode (available when “Infrastucture” is selected as the network type)
– Enable or disable the power save operation. (Default: CAM)
- CAM – Constantly awake mode, which always keeps the radio on.
- PSM – Power save mode, which turns the radio off when no data is being
transferred.
• TX Power – The amount of power transmitted by the radio when sending a signal.
(Default: Auto)
• Preamble (availabe when “Ad hoc” is selected as the network type) – Select
“Auto” to have the Wireless USB Adapter automatically use short preamble if the
clients and access points in your wireless network support this feature, otherwise
select “Long”. (Default: Auto)
• Channel (only availabe when “Ad hoc” is selected as the network type) – The radio
channel used to communicate with wireless clients. The channel has to be the
same as the peer computer. (Default: 1)
• RTS Threshold – Adjust the RTS threshold value by sliding the bar or key in the
value directly when the feature is enabled. (Default: Disabled)
Sets the packet size threshold at which a Request to Send (RTS) signal must be
sent to a receiving station prior to the sending station starting communications.
The Wireless USB Adapter sends RTS frames to a receiving station to negotiate
the sending of a data frame. After receiving an RTS frame, the station sends a
CTS (clear to send) frame to notify the sending station that it can start sending
data.
If the RTS threshold is set to 0, the Wireless USB Adapter always sends RTS
signals. If set to 2347, the Wireless USB Adapter never sends RTS signals. If set
to any other value, and the packet size equals or exceeds the RTS threshold, the
RTS/CTS (Request to Send / Clear to Send) mechanism will be enabled.
Wireless devices contending for the medium may not be aware of each other. The
RTS/CTS mechanism can solve this “Hidden Node Problem.” (Range: 0-2347
bytes: Default: 2347 bytes)
• Fragment Threshold – Adjust the Fragment threshold value by sliding the bar or
key in the value directly when the feature is enabled. (Default: Disabled)
The fragmentation threshold is the minimum packet size that can be fragmented
when passing through the adapter. Fragmentation of the PDUs (Package Data
Unit) can increase the reliability of transmissions because it increases the
probability of a successful transmission due to smaller frame size. If there is
significant interference present, or collisions due to high network utilization, try
setting the fragment size to send smaller fragments. This will speed up the
retransmission of smaller frames. However, it is more efficient to set the fragment
size larger if very little or no interference is present because it requires overhead
to send multiple frames. (Range: 256-2346 bytes; Default: 2346 bytes)
Click Ok to confirm the configuration or click Cancel to cancel the settings.