Extreme Networks Summit WM User Manual page 110

Configuring the Altitude AP
Min Basic Rate. If both Min Basic Rate and Max Basic Rate are set to an 11g-specific (OFDM)
rate, (for example, 6, 12, or 24 Mbps) all basic rates will be 11g-specific.
Max Basic Rate - Click the maximum data rate that must be supported by all stations in a BSS: 1,
2, 5.5, or 11 Mbps for 11b and 11b+11g modes. Click 1, 2, 5.5, 6, 11, 12, or 24 Mbps for 11g-only
mode. If necessary, the Max Basic Rate choices adjust automatically to be higher or equal to the
Min Basic Rate. If both Min Basic Rate and Max Basic Rate are set to an 11g-specific (OFDM)
rate, (for example, 6, 12, or 24 Mbps) all basic rates will be 11g-specific.
Max Operational Rate - Click the maximum data rate that clients can operate at while associated
with the AP: 1, 2, 5.5, or 11 Mbps for 11b-only mode. Click 1, 2, 5.5, 6, 9, 11, 12, 18, 24, 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 - Click the number of retries for the Background transmission
queue. The default value is adaptive (multi-rate). The recommended setting is adaptive (multi-
rate).
No of Retries for Best Effort BE - Click the number of retries for the Best Effort transmission
queue. The default value is adaptive (multi-rate) The recommended setting is adaptive (multi-
rate).
No of Retries for Video VI - Click the number of retries for the Video transmission queue. The
default value is adaptive (multi-rate). The recommended setting is adaptive (multi-rate).
No of Retries for Voice VO - Click the number of retries for the Voice transmission queue. The
default value is adaptive (multi-rate). The recommended setting is adaptive (multi-rate).
No of Retries for Turbo Voice TVO - Click the number of retries for the Turbo Voice
transmission queue. The default value is adaptive (multi-rate). The recommended setting is
adaptive (multi-rate).
7 In the 11b Settings section, do the following:
Preamble - Click a preamble type for 11b-specific (CCK) rates: Short or Long. Click Short if you
are sure that there is no pre-11b AP or a client in the vicinity of this AP. Click Long if
compatibility with pre-11b clients is required.
8 In the 11g Settings section, do the following:
Protection Mode - Click a protection mode: None, Auto, or Always. The default and
recommended setting is Auto. Click None if 11b APs and clients are not expected. Click Always
if you expect many 11b-only clients.
Protection Rate - Click 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 - Click a protection type: CTS Only or RTS CTS. The default and recommended
setting is CTS Only. Click 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.
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Summit WM User Guide, Software Version 5.3