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36, 28, or 54 Mbps for 11b+11g or 11g-only modes. If necessary, the Max Operational Rate choices
adjust automatically to be higher or equal to the Min Basic Rate.
No of Retries for Background BK – Select the number of retries for the Background transmission
●
queue. The default value is 4. The recommended setting is adaptive (multi-rate).
No of Retries for Best Effort BE – Select the number of retries for the Best Effort transmission
●
queue. The default value is 4. The recommended setting is adaptive (multi-rate).
No of Retries for Video VI – Select the number of retries for the Video transmission queue. The
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default value is 4. The recommended setting is adaptive (multi-rate).
No of Retries for Voice VO – Select the number of retries for the Voice transmission queue. The
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default value is 1. The recommended setting is adaptive (multi-rate).
No of Retries for Turbo Voice TVO – Select the number of retries for the Turbo Voice
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transmission queue. The default value is 1. The recommended setting is adaptive (multi-rate).
Preamble – Select a preamble type for 11b-specific (CCK) rates: Short, Long, or Auto. The
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recommended value is Auto. Select Short if you are sure that there is no pre-11b AP or a client in
the vicinity of this AP. Select Long if compatibility with pre-11b clients is required.
Protection Mode – Select a protection mode: None, Auto, or Always. The default and
●
recommended setting is Auto. Select None if 11b APs and clients are not expected. Select Always
if you expect many 11b-only clients.
Protection Rate – Select a protection rate: 1, 2, 5.5, or 11 Mbps. The default and recommended
●
setting is 11. Only reduce the rate if there are many 11b clients in the environment or if the
deployment has areas with poor coverage. For example, rates lower than 11 Mbps are required to
ensure coverage.
Protection Type – Select a protection type: CTS Only or RTS CTS. The default and
●
recommended setting is CTS Only. Select RTS CTS only if an 11b AP that operates on the same
channel is detected in the neighborhood, or if there are many 11b-only clients in the environment.
NOTE
The overall throughput is reduced when Protection Mode is enabled, due to the additional overhead caused by the
RTS/CTS. The overhead is minimized by setting Protection Type to CTS Only and Protection Rate to 11 Mbps.
Although, the overhead causes the overall throughput to be sometimes lower than if just 11b mode is used. If
there are many 11b clients, it is recommended to disable 11g support (11g clients are backward compatible
with 11b APs).
An alternate approach, although a more expensive method, is to dedicate all APs on a channel for 11b (for
example, disable 11g on these APs) and disable 11b on all other APs. The difficulty with this method is that the
number of APs must be increased to ensure coverage separately for 11b and 11g clients.
Summit WM20 User Guide, Software Release 4.2
Modifying Wireless AP Settings
73
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