3Com 3CRWE870075A - Wireless LAN Access Point 8700 User Manual page 36

In normal mode the channel bandwidth is 20 MHz. In Turbo Mode the
channel bandwidth is increased to 40 MHz. However, only a limited number
of channels are available when Turbo Mode is enabled.
Turbo Mode is not regulated in the IEEE 802.11a standard, and it is not
allowed in some countries.
Radio Channel—From the pull-down list, select the radio channel over which
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the access point communicates to computers in its BSS. Available channel
settings are limited by local regulations that determine which channels are
allowed. The client channel for wireless users is automatically set to that used
by the access point to which they are linked. When multiple access points are
deployed in the same area, be sure to choose channels separated by at least
five channels to avoid channel interference. You can deploy up to three access
points in the same area; for example, Ch1, Ch6, and Ch11.
Auto Channel Select (802.11a only)—Select Auto Channel Select Enable to
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allow the access point to select a radio channel automatically. (Default: Enable)
Transmit Power (802.11a only)—Set the signal strength transmitted from
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the access point. The longer the transmission distance, the higher the
transmission power required. (Default: 100%)
Maximum Station Data Rate—Select the appropriate data rate from the
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drop-down list for the data transfer speed running on your network. (802.11a
default: 54 Mbps; 802.11b default: 11 Mbps.) In order to reach all clients, this
rate should be set lower (for example, 1 or 2 Mbps on an 802.11b radio). To
isolate clients that are unable to connect at higher rates, set this value higher.
Beacon Interval (20-1000)—Sets the beacon signal interval at which beacon
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frames are transmitted from the access point. The beacon signals allow
wireless devices to maintain contact with each other. They may also carry
power-management information. The Beacon Interval unit is TU, which
corresponds to 1024 microseconds. (Default: 100 TU)
Fragment Length (256-2346) (802.11a only)—The Fragment Length can be
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set between 256 and 2,346. If the packet size is smaller than the preset
fragment size, the packet will not be segmented.
Fragmentation of the PDUs (Package Data Unit) can increase the reliability of
transmissions because it increases the probability of a successful transmission
due to smaller frame size. If there is significant interference present, or
collisions due to high network utilization, try setting the fragment size to
send smaller fragments. This will speed up the retransmission of smaller
frames. However, it is more efficient to set the fragment size larger if very
little or no interference is present because it requires overhead to send
multiple frames. (Default: 2346)
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