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SonicOS 5.8.1 Administrator Guide
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Standard Channel - This pulldown menu only displays when the 20 MHz channel is
selected. By default, this is set to Auto, which allows the appliance to set the optimal
channel based on signal strength and integrity. Optionally, you can select a single
channel within the range of your regulatory domain. Selecting a specific a channel can
also help with avoiding interference with other wireless networks in the area.
• Wide - 40 MHz Channel - Specifies that the 802.11n radio will use only the wide 40 MHz
channel. When this option is selected, the Primary Channel and Secondary Channel
pulldown menus are displayed:
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Primary Channel - By default this is set to Auto. Optionally, you can specify a specific
primary channel.
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Secondary Channel - The configuration of this pulldown menu is controlled by your
selection for the primary channel:
• If the primary channel is set to Auto, the secondary channel is also set to Auto.
• If the primary channel is set to a specific channel, the secondary channel is set to
to the optimum channel to avoid interference with the primary channel.
Enable Short Guard Interval: Specifies the short guard interval of 400ns (as opposed to the
standard guard interval of 800ns). The guard interval is a pause in transmission intended to
avoid data loss from interference or multipath delays.
Enable Aggregation: Enables 802.11n frame aggregation, which combines multiple frames to
reduce overhead and increase throughput.
Tip The Enable Short Guard Interval and Enable aggregation options can slightly improve
throughput. They both function best in optimum network conditions where users have strong
signals with little interference. In networks that experience less than optimum conditions
(interference, weak signals, etc.), these options may introduce transmission errors that
eliminate any efficiency gains in throughput.
802.11b/g Wireless Settings
When the wireless radio is configured for 802.11b or 802.11g, the Channel pulldown menu is
displayed. An Auto setting allows the wireless security appliance to automatically detect and
set the optimal channel for wireless operation based upon signal strength and integrity. Auto is
the default channel setting, and it displays the selected channel of operation to the right.
Alternatively, an operating channel within the range of your regulatory domain can be explicitly
defined.