Airlink WLL013 Manual - Page 37

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Chapter 3 Wireless LAN Monitor Utility Advanced Advanced feature allows you to change advanced configuration settings: Preamble Type, Fragmentation Threshold, RTS/CTS Threshold and Power Save. Preamble Type: The preamble is part of the IEEE 802.11b physical layer specification. All 802.11b devices are mandatory to support the long preamble format, but may optionally support the short preamble. This Wireless LAN Card supports the short preamble. The Short option allows to communicate with other 802.11b devices which support short preamble to boost the throughput. The Long option is typically used in a "noisy" network. Make sure to use the appropriate preamble type according to your network environment. Fragmentation Threshold: The fragmentation threshold, which is specified in bytes, determines whether packets will be fragmented and at what size. On an 802.11 wireless LAN, packets exceed the fragmentation threshold are fragmented, i.e., split into, smaller units suitable for the circuit size. Packets smaller than the specified fragmentation threshold value are not fragmented. RTS/CTS Threshold: When set (in bytes), it specifies the packet size beyond which the Wireless LAN Card invokes its RTS/CTS mechanism. Packets that exceed the specified RTS threshold trigger the RTS/CTS mechanism. The NIC transmits smaller packets without using RTS/CTS. 31

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Chapter 3
Wireless LAN Monitor Utility
31
Advanced
Advanced
feature allows you to change advanced configuration settings:
Preamble Type
,
Fragmentation Threshold
,
RTS/CTS Threshold
and
Power Save
.
Preamble Type:
The preamble is part of the IEEE 802.11b physical layer specification. All
802.11b devices are mandatory to support the long preamble format, but may optionally
support the short preamble. This Wireless LAN Card supports the short preamble. The
Short
option allows to communicate with other 802.11b devices which support short preamble to
boost the throughput. The
Long
option is typically used in a ±noisy² network. Make sure to
use the appropriate preamble type according to your network environment.
Fragmentation
Threshold:
The fragmentation threshold, which is specified in bytes,
determines whether packets will be fragmented and at what size. On an 802.11 wireless LAN,
packets exceed the fragmentation threshold are fragmented, i.e., split into, smaller units
suitable for the circuit size. Packets smaller than the specified fragmentation threshold value
are not fragmented.
RTS/CTS Threshold:
When set (in bytes), it specifies the packet size beyond which the
Wireless LAN Card invokes its RTS/CTS mechanism. Packets that exceed the specified RTS
threshold trigger the RTS/CTS mechanism. The NIC transmits smaller packets without using
RTS/CTS.