Figure 3-13: Advanced Tab - Alvarion BU-DS.11 User Manual

The DS.11 Configuration Utility
Advanced Tab
The Advanced tab provides additional performance parameters.
The Advanced tab is comprised of the following components:
♦ CW Min/Max: The size of the Contention Window. The contention window
back-off algorithm is a method used to resolve contention between different
stations trying to access the medium. The valid range is from 7 to 1023.
Defaults are 31 for CW Min and 1023 for CW Max.
Setting the CW min parameter to 7 should only be used for short-range point-
to-point links.
Setting the CW min to 15 will improve performance for more uni-directional
traffic loads.
CW min of 31 will minimize the PER for heavy bi-directional traffic loads.
CW Min of 63 should be used for large, long-range multi-point links.
♦ RTS Threshold: The minimum packet size required for an RTS (Request to
Send) to be sent. For packets with a size below the RTS Threshold value, an
RTS is not sent and the data packet is transmitted directly to the WLAN. The
range is from 60 to 2347 bytes. The default is the maximum value, which
practically disables the RTS/CTS mechanism.
♦ Short Retry Limit: The maximum number of transmission attempts for a
frame that is shorter than or equal to the RTS Threshold. The range is from 1
to 255. The default value is 8.
♦ Long Retry Limit: The maximum number of transmission attempts for a frame
that is longer than the RTS Threshold. The range is from 1 to 255. The default
value is 4.

Figure 3-13: Advanced Tab

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