Brocade Mobility 5181 Access Point Product Reference Guide (Supporting software release 4.4.0.0) - Manual (Page 137)

Brocade Mobility 5181 Access Point Product Reference Guide 123
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Enabling wireless LANs (WLANs)
5
Channel Setting The following channel setting options exist:
User Selection - If selected, use the drop-down menu to specify the legal
channel for the intended country of operation. The drop-down menu is not
available if this option is not selected.
Automatic Selection - When the access point is booted, the access point
scans non-overlapping channels listening for beacons from other access
points. For 802.11b, it scans channels 1, 6, and 11. For 802.11a, all
channels are non-overlapping. After the channels are scanned, it will
select the channel with the fewest access points. In the case of multiple
access points on the same channel, it will select the channel with the
lowest average power level.
Select the Exclude Channels button to display a screen used to prohibit
802.11a or 802.11b/g channels from operating with this radio. When
channel exceptions are defined, the access point skips the channels
specified. When the Automatic Selection feature is enabled, up to 3
separate channels can be excluded. Imported and exported
configurations retain their defined exception list configurations. The
channels selected for exclusion display beneath the Uniform Spreading
button. This option is disabled by default. It’s important to note that
excluded channels do not apply to sensor scans or rogue detection
configurations. Additionally, country of operation blocks are not impacted
by the channels selected for exclusion. A reboot is required when enabling
or disabling this feature.
The Uniform Spreading option is available (and is the default setting for
the 802.11a radio). To comply with Dynamic Frequency Selection (DFS)
requirements in the European Union, the 802.11a radio uses a randomly
selected channel each time the access point is powered on.
Antenna Diversity Specifies the antenna selection for the 802.11a radio. Options include
Primary Only, Secondary Only and Full Diversity. The default setting is
Primary. However, Diversity can improve performance and signal reception
in areas where interference is significant and is recommended when two
antennas are supported.
Power Level Defines the transmit power of the 802.11a or 802.11b/g antenna(s). The
values are expressed in dBm and mW.
802.11 b/g mode Specify b only, g only or b and g to define whether the
802.11b/g radio transmits in the 2.4 Ghz band exclusively for 802.11b
(legacy) clients or transmits in the 2.4 Ghz band for 802.11g clients.
Selecting b and g enables the Mobility 5181 Access Point to transmit to
both b and g clients if legacy clients (802.11b) partially comprise the
network. Select accordingly based on the Client requirements of the
network. This parameter does not apply to Mobility 5181 Access Point
802.11a radios.
Set Rates Click the Set Rates button to display a window for selecting minimum and
maximum data transmit rates for the radio. At least one Basic Rate must
be selected as a minimum transmit rate value. Supported Rates define
the data rate the radio defaults to if a higher selected data rate cannot be
maintained. Click OK to implement the selected rates and return to the
802.11a or
802.11b/g radio configuration screen.
Clicking Cancel reverts the Set Rates screen to the last saved
configuration. Brocade recommends using the default rates unless
qualified to understand the performance risks of changing them. The
appearance of the Set Rates screen varies depending on the 802.11a or
802.11b/g used, as the dates rates available to the two radios are
different.