User's Guide

Table Of Contents
Configuring the Wireless AP
hwc_apstartup.fm
Configuring Wireless AP settings
9034530-02, March 2010
148 HiPath Wireless Controller, Access Points and Convergence Software V7.11, User Guide
DCS Update Period – Type the time, measured in minutes that
determines the period during which the Wireless AP averages the
DCS Noise Threshold and DCS Channel Occupancy Threshold
measurements. If either one of these thresholds is exceeded, then
the Wireless AP will trigger ACS.
19. In the Advanced dialog 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 Wireless 802.11n AP. Click Long if compatibility with
pre-11b clients is required.
20. In the Advanced dialog 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. 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 potentially 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.
21. In the Advanced dialog 11n Settings section, do the following: