Summit WM User Guide, Software Version 5.3 97
z 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. 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.
8 In the 11n Settings section, do the following:
z Protection Mode - Click a protection mode: Enabled or Disabled. This protects high throughput
transmissions on primary channels from non-11n APs and clients. Click Disabled if non-11n APs
and clients are not expected. Click Enabled if you expect many non-11n APs and clients. The
overall throughput is reduced when Protection Mode is enabled.
z 40MHz Protection Mode - Click a protection type, CTS Only or RTS- CTS, or None, when a
40MHz channel is used. This protects high throughput transmissions on extension channels from
interference from non-11n APs and clients.
z 40MHz Prot. Channel Offset - Select a 20MHz channel offset if the deployment is using channels
that are 20MHz apart (for example, using channels 1, 5, 9, and 13) or a 25MHz channel offset if
the deployment is using channels that are 25MHz apart (for example, using channels 1, 6, and 11.
z 40MHz Channel Busy Threshold - Type the extension channel threshold percentage, which if
exceeded, will disable transmissions on the extension channel (40MHz).
z Aggregate MSDUs - Click an aggregate MSDU mode: Enabled or Disabled. Aggregate MSDU
increases the maximum frame transmission size.
z Aggregate MSDU Max Length - Type the maximum length of the aggregate MSDU. The value
range is 2290-4096 bytes.
z Aggregate MPDUs - Click an aggregate MPDU mode: Enabled or Disabled. Aggregate MPDU
provides a significant improvement in throughput.
z Aggregate MPDU Max Length - Type the maximum length of the aggregate MPDU. The value
range is 1024-65535 bytes.
z Agg. MPDU Max # of Sub-frames - Type the maximum number of sub-frames of the aggregate
MPDU. The value range is 2-64.
z ADDBA Support - Click an ADDBA support mode: Enabled or Disabled. ADDBA, or block
acknowledgement, provides acknowledgement of a group of frames instead of a single frame.
ADDBA Support must be enabled if Aggregate APDU is enable.
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